渤海湾西MIS3阶段海侵边界探讨

引用本文

鲁庆伟. 渤海湾西MIS3阶段海侵边界探讨[J].中国地质调查, 2021,8(1): 89-96.
LU Qingwei. Discussion on the transgression boundary of MIS3 stage in the western coast of Bohai Bay[J].Geological Survey of China, 2021,8(1): 89-96. 复制到剪切板

doi: 10.19388/j.zgdzdc.2021.01.10

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渤海湾西MIS3阶段海侵边界探讨

鲁庆伟

天津华北地质勘查局地质研究所,天津 300170

作者简介: 鲁庆伟(1982—),男,高级工程师,主要从事区域地质及第四纪地质研究工作。Email: qingweilu@163.com。

收稿日期: 2020-05-22

基金资助: 中国地质调查局天津地质调查中心“天津1:5万静海、唐官屯幅区域地质调查(编号: 津[2016]01040-14)”和天津市规划和自然资源局“天津市蔡公庄乡幅、南台幅、中旺镇幅和太平镇幅1:5万区域地质调查(编号: 国土房任[2014]20号)”项目联合资助

摘要

渤海湾西天津南部平原区是研究海侵和海平面变化的天然理想场所。基于2个钻孔(ZKQ1孔和ZK1孔)沉积特征、测年(AMS¹⁴C)及微体古生物和生物壳体等综合研究,推测研究区MIS3阶段第2海侵的最大影响边界在ZK1孔和ZKQ1孔两孔之间,界线西侧表现为河湖相的陆相沉积,界线东侧为滨海湖沼的过渡相沉积,该位置即是现今黑龙港河一带,也曾是古河道故道,推测该期海侵影响范围受到了古河道制约。结合研究区前期3个钻孔(ZKQ4孔、CGZ5孔和CGZ7孔)资料,建立了E→W向(海→陆)联合钻孔对比剖面,进一步对MIS3阶段海侵层位追踪,表明E→W依次由海相(CGZ7孔、CGZ5孔)→过渡相(ZKQ4孔、ZKQ1孔)→陆相(ZK1孔)相变。推测研究区内MIS3阶段海侵边界位于静海区的东尚码头村(CGZ5孔)和高家庄(ZKQ4孔)一带。研究成果对恢复该区域古地理演化、海平面变迁研究以及水工环地质勘查等具有重要意义。

关键词: 渤海湾; 海侵; 测年; MIS3阶段; 沉积环境

中图分类号:P534.63 文献标志码:A 文章编号:2095-8706(2021)01-0089-08

Discussion on the transgression boundary of MIS3 stage in the western coast of Bohai Bay

LU Qingwei

Geological Institute of North China Geological Exploration Bureau of Tianjin, Tianjin 300170, China

Abstract

The Southern Tianjin Plain, located in the western coast of Bohai Bay, is an ideal natural place to study the transgression and sea level change. Based on the comprehensive research of sedimentary characteristics, dating (AMS¹⁴C) and micro paleontology of two boreholes (ZKQ1 and ZK1), the authors inferred that transgression maximum influence boundary in the MIS 3 stage was between two boreholes (ZK1 and ZKQ1). The western side of the boundary is continental sedimentary, and the eastern side of the boundary is transitional sedimentary. boundry location was in the area of the present Heilonggang River and was once an ancient river channel, so it is speculated that the area affected by the transgression in this period was restricted by the ancient river channel. Combined with the previous three boreholes (ZKQ4, CGZ5 and CGZ7) data, the author has established the profile of the E→W direction (sea → land) and further confirmed that E→W in this area was transformed from Marine facies (CGZ7 and CGZ5) to transitional sedimentary (ZKQ4 and ZKQ1) to continental facies (ZK1). It is speculated that the transgression boundary of MIS3 is in the area of Dongshangmatou (CGZ5) and Gaojiazhuang (ZKQ4) in Jinghai district. This achievement is of great significance to the restoration of paleogeographic evolution, the sea-level change research and the geological exploration of hydraulic environment in this region.

Keyword: Bohai Bay; transgression; dating; MIS3 stage; sedimentary environment

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0 引言

2020年4月30日自然资源部发布的《2019年中国海平面公报》^[1]显示, 1980— 2019年中国沿海海平面上升速率为3.4 mm/a, 预测未来30 a, 中国沿海海平面将上升51~179 mm。《气候变化中的海洋和冰冻圈特别报告》^[2]评估了区域海平面上升对低海拔(< 10 m)沿海地区和社会的影响以及相关的风险^[3]。因此, 加强古环境、海平面变迁研究, 对沿海城市防灾减灾具有很强的现实意义。引起海岸线大范围变化的原因主要有3个: 海面的变化、地壳的升沉与河流的堆积。国家海岸带和海洋地质计划认为, 海岸带问题的解决需要向内陆扩展, 向流域、山脉探寻地质作用根源^[4]。研究区作为“ 源-汇” 过程中的关键环节, 是研究海侵和海平面变化的天然实验室, 晚第四纪以来沉积地层中记录了具有古海岸线指示意义的3期海侵(自上而下依次为第1、2、3海侵层)^{[5, 6, 7, 8, 9, 10, 11, 12, 13, 14]}和贝壳堤地质遗迹^{[15, 16, 17, 18]}。对于全新世海侵边界(第1海侵层)追踪探讨已有相关研究: 李凤林^[18]根据微地貌、微体古生物、考古学、地层及年代学进行地层对比, 圈定了渤海湾西岸全新世海侵最大边界; 方晶等^[19]通过钻孔黏土混浊水电导率, 结合贝类及有孔虫鉴定等, 探讨了天津市西南全新世最大海侵的特征; 刘艳霞等^[20] 结合钻孔与探地雷达的测量方法探测了渤海西南岸全新世最大海侵界线。然而, 对于晚更新世海侵(第2、3海侵层)缺乏由海向陆的追踪研究。本文通过研究区ZKQ1孔和ZK1孔沉积特征、测年(AMS ¹⁴C)及微体古生物(有孔虫、介形类)等综合分析, 并与该区域前期3个钻孔(ZKQ4孔、CGZ5孔、CGZ7孔)进行联合追踪对比研究, 探讨了MIS3阶段海侵(第2海侵)边界以及最大影响边界, 为今后该区古地理演化、海平面变迁研究以及水工环地质勘查等提供重要的基础地学资料。

1 区域地质概况

研究区位于渤海湾西部、天津市南部平原区, 北靠燕山, 西为太行山, 属中新生代断陷盆地。重力资料^[21]显示, 该断陷盆地存在NE向隆坳相间的构造格架, 分别为冀中坳陷、沧县隆起和黄骅坳陷3个Ⅲ 级构造单元(图1)。该区无基岩出露, 钻孔揭露地层有新生界第四系、新近系和古近系以及更老地层。坳陷区和隆起区新生界底界埋深分别为3~4 km和1~2 km^[22]。第四系底界埋深约在130~340 m^{[9, 13, 14]}。受全球性气候变化引起的海平面波动和岸线的频繁迁移, 研究区第四纪以来历经海陆的变化, 形成了海相和陆相沉积物交替出现的地层以及贝壳堤遗迹^{[15, 16, 17, 18]}, 为海侵事件、海岸线变迁及海面变化等研究提供了天然的理想实验室。

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	图1 钻孔位置、MIS3阶段海侵边界及构造分区Fig.1 Boreholes location, transgression boundary in MIS3 stage and tectonic division

本文研究的ZKQ1孔(孔深400 m)和ZK1孔(孔深300 m), 分别位于天津市静海区西长屯村和三呼庄村, 构造位置属于沧县隆起(图1)。两孔均选取50 m以浅地层进行研究, 钻孔口径110 mm, 取心率87%, 孔斜< 1° 。

2 材料与实验流程

2.1 AMS ¹⁴C测年

在ZKQ1孔和ZK1孔中取3件样品(表1)。

表1 AMS ¹⁴C测年结果 Tab.1 Dating results of AMS ¹⁴C

采样对象为钻孔新鲜岩心中无污染的泥炭, 及时密封并送至北京大学考古实验室完成测试。树轮校正所用曲线为IntCal13 atmospheric curve^[23], 所用程序为OxCalv4.2.4。AMS ¹⁴C测年结果见表1。

2.2 微体古生物鉴定

取样品20 g放入量杯中并用双氧水加水浸泡开, 用280目筛淘洗, 筛上物置于蒸发皿并放入烤箱烘干, 利用显微镜分门别类挑选、鉴定和统计, 包括有孔虫、介形类、双壳类以及腹足类等。制作统计曲线图(图2), 结合沉积特征进行沉积环境判别。

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	图2 ZKQ1孔、ZK1孔岩心照片、岩性柱、AMC¹⁴C测年、层段划分、微体古生物统计曲线、地层时代与沉积环境Fig.2 Core photos, lithology column, dating results of AMC¹⁴C, division of sedimentary member, micropaleontologicastatistical curve, stratigraphic age and sedimentary environment in boreholes ZKQ1 and ZK1

3 钻孔沉积环境分析

3.1 ZKQ1孔沉积环境分析

(1)0~2.90 m层段(U8)。黄棕色粉砂质黏土, 为泛滥平原沉积。

(2)2.90~8.10 m层段(U7)。下部为锈黄色夹潜育化黏土质粉砂, 波状层理; 上部为灰色、灰黑色粉砂质黏土, 水平层理, 含零星裂缝希望虫、丰满陈氏介以及小玻璃介、布氏土星介等广盐低盐种组合, 指示有淡水注入的滨海湖沼相沉积。

(3)8.10 ~10.55 m层段(U6)。深灰色黏土质粉砂, 波状层理, 透镜状层理; 底部见生物潜穴, 略显生物扰动, 10.15 m处获得AMS ¹⁴C校正年龄8 910 cal.a BP, 时代属于中全新世(据国际年代地层表V2018/08); 含光滑九字虫、裂缝希望虫等有孔虫以及丰满陈氏介、典型中华美花介等海相介形类, 为MIS1阶段海相(潮间带)沉积。

(4)10.55~13.10 m层段(U5)。浅灰色粉砂质黏土, 水平层理; 含纯净小玻璃介、布氏土星介等非海相介形类以及白小旋螺等淡水腹足类; 为海侵发生之前贫营养湖沉积(U5至U6层位为贫营养湖→ 富营养湖→ 海侵沉积)。

(5)13.10~19.65 m层段(U4)。上部为锈黄色黏土质粉砂; 下部为黄色粉砂。波状层理, 底部可见冲刷侵蚀面; 为分支河道沉积。

(6)19.65~29.10 m层段(U3)。上部为灰棕色粉砂质黏土, 弱潴育化, 局部可见近垂直的生物潜穴和生物轻扰动, 见毛蚶和光滑河蓝蛤等海相生物, 为高潮坪沉积; 中部为浅黄灰色粉砂质黏土, 局部砂质含量略高, 波状层理, 含零星钙质结核和少量有机质斑点; 下部为灰色、灰黑色黏土质粉砂。28.30 m处获得AMS ¹⁴C校正年龄29 460 cal.a BP, 相当于MIS3阶段沉积。含光滑抱环虫、阿卡尼圆形五玦虫、光滑九字虫、裂缝希望虫、毕克卷转虫变种等有孔虫; 海相介形类以典型中华美花介为主且含少许中华洁面介、布氏纯艳花介、陈氏新单角介等; 含零星布氏土星介、柯氏土星介、双折土星介等非海相介形类; 见白小旋螺、副豆螺等淡水腹足类生物壳体, 为滨海湖沼沉积。

(7)29.10~39.70 m层段(U2)。以黄色粉砂为主, 上部黏土质粉砂, 波状层理, 底部可见冲刷侵蚀面, 为河道沉积。

(8)39.70~50.00 m层段(U1)。上部为棕色粉砂质黏土, 见生物扰动及生物潜穴被锈黄色粉砂充填; 中下部为黄棕色夹浅灰色粉砂质黏土, 含零星布氏土星介和纯净小玻璃介等非海相介形类, 泛滥平原夹湖(沼)相, MIS5阶段沉积。

3.2 ZK1孔沉积环境分析

(1)0~6.05 m(U8)。中上部为棕黄色黏土质粉砂, 略显水平层理; 下部为棕色粉砂质黏土, 块状构造, 为泛滥平原沉积。

(2)6.05~13.10 m(U7)。浅灰色黏土质粉砂; 波状层理、交错层理; 含少量光滑九字虫、毕克卷转虫变种、有孔虫以及少量典型中华美花介、丰满陈氏介等海相介形类和零星疏忽玻璃介、布氏土星介等非海相介形类, 以及豆螺未定种、白小旋螺等非海相腹足类, 为滨海湖沼相沉积。

(3)13.10~13.85 m(U6)。灰色粉砂质黏土, 波状层理、透镜状层理; 含较多光滑九字虫、毕克卷转虫变种; 少见粉砂充填的生物潜穴, 底部见有机质泥炭层, 获得AMS ¹⁴C日历年龄7 930 cal. a BP, 为MIS1阶段海相沉积。

(4)13.85~14.60 m(U5)。浅灰色黏土质粉砂, 波状层理, 含零星白小旋螺, 为湖相沉积。海平面上升, 末次盛冰期下切河谷(U4)首先接受沉积, 自淡灰色(U5)到灰色、黑色(U6), 符合海侵发生之前, 由贫营养湖因降水增大、有机质分解增强, 逐渐积累到接近泥炭(即海侵层下伏的基底泥炭)的旋回。

(5)14.60~25.50 m(U4)。黄色粉砂, 水平层理, 局部见生物碎屑富集, 底部可见冲刷侵蚀面, 为分支河道沉积。

(6)25.50~30.10 m(U3)。浅灰色粉砂质黏土, 局部夹棕色黏土和棕黄色黏土质粉砂; 水平层理、块状层理; 含淡水双壳类丽蚌, 为MIS3阶段湖相沉积, 并反映出湖水水位波动性。

(7)30.10~35.00 m(U2)。锈黄色黏土质粉砂, 块状层理、透镜状层理, 略具水平潴育化锈染, 为泛滥平原沉积。

(8)35.00~50.00 m(U1)。棕黄色粉砂质黏土夹浅黄灰色— 浅灰色粉砂质黏土, 41.05~41.70 m处可见淡水双壳类丽蚌, 应为湖相, 下部灰色层位, 未见生物壳体, 块状层理, 推测为积水洼地。总体为泛滥平原夹湖相沉积, 属于MIS5阶段。

4 MIS3阶段海侵边界探讨

对于第2海侵的发生时间存在争议, 依据有机质¹⁴C测年, 其时代为MIS3阶段^[7], 王福等^[24]和商志文等^[25]第在Ⅱ 海相层获得的¹⁴C样品年龄均大于43.5 ka BP, 形成于MIS3早期或MIS5。而依据光释光(Optically Stimulated Luminesecence, OSL)测年, 其时代可能为MIS3或MIS5^{[26, 27, 28, 29]}; 依据地层和气候特征, 其时代为MIS3阶段^[10]。与全新世海侵层基底泥炭相似, 第2海侵发生之前亦形成基底泥炭, 是海面变化控制下的一个重要层位。ZKQ1孔28.30 m处获得AMS ¹⁴C校正年龄29 460 cal. a BP(表1), 该研究青县滕庄子ZKT1孔^[14]在25.35 m获得AMS ¹⁴C校正年龄为 36 770 cal. a BP, 在静海、唐官屯幅以及蔡公庄乡幅、南台幅、中旺镇幅、太平镇幅四幅等1: 5万区调项目等20多个钻孔中, 获得样品的AMS ¹⁴C测年均在22~40 ka BP(表2), 可以笼统称为40 ka BP以来沉积^[30], 应属于MIS3阶段。

表2 AMS ¹⁴C测年结果 Tab.2 Dating results of AMS ¹⁴C

关于MIS3阶段第2海侵最大影响边界, 研究钻孔沉积特征表明, ZK1孔(25.50~30.10 m)U3层段为浅灰色粉砂质黏土, 见较多淡水丽蚌生物壳体, 为湖相沉积(图2)。ZKQ1孔19.65~29.10 m层段(U3), 上部为灰棕色潴育化粉砂质黏土, 见近垂直的生物潜穴和生物扰动现象, 为高潮坪沉积; 下部为灰色、灰黑色黏土质粉砂。含光滑抱环虫、阿卡尼圆形五玦虫、光滑九字虫、裂缝希望虫、毕克卷转虫变种等有孔虫。海相介形类以典型中华美花介为主, 少许中华洁面介、布氏纯艳花介、陈氏新单角介等; 含零星布氏土星介、柯氏土星介、双折土星介等非海相介形类; 见白小旋螺、副豆螺等淡水腹足类生物壳体。为滨海湖沼沉积。由此可知, 推测出MIS3阶段第2海侵最大影响边界在ZK1孔和ZKQ1孔之间, 该位置即是现今黑龙港河一带, 也曾是古河道故道, 推测该期海侵影响范围受到了古河道制约。

同时, 本次研究钻孔(ZKQ1, ZK1)与前期钻孔(CGZ7, CGZ5, ZKQ4)形成E→ W(海→ 陆)区域联合钻孔对比剖面(图3), 对第2海侵边界进行追踪, MIS3海侵层位稳定^{[13, 14]}。其中CGZ7孔28.9~31.2 m有孔虫极丰富, 以毕克卷转虫、光滑九字虫、光滑抱环虫为主, 介形类主要有典型中华美花介和陈氏新单角介, 为潮间带沉积。CGZ5孔28.90~31.60 m为黏土质粉砂, 含蛏子、毛蚶等生物壳体, 上覆河口相砂坝沉积, 含较多光滑蓝蛤等, 底部为还原环境的灰色粉砂, 为潮间带沉积。ZKQ4孔24.60~27.60 m为棕黄色夹浅灰色粉砂质黏土, 含零星毕克卷转虫变种等有孔虫和纯净小玻璃介、布氏土星介等非海相介形类, 以及白小旋螺等, 为滨海湖相沉积。

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	图3 MIS3阶段海侵钻孔对比剖面Fig.3 Boreholes contrast section of transgression in MIS3 stage

综上钻孔地层沉积特征可知, 该区域E→ W方向MIS3海侵层位依次表现为海相(CGZ7孔、CGZ5孔)→ 过渡相(ZKQ4孔、ZKQ1孔)→ 陆相(ZK1孔), 推测该区MIS3阶段海侵边界应在静海区的东尚码头村(CGZ5孔)和高家庄(ZKQ4孔)之间一带。

5 结论

(1)通过ZKQ1和ZK1钻孔沉积特征、AMS ¹⁴C测年及微体古生物和生物壳体等综合研究, 推测该区MIS3阶段最大海侵影响边界在静海区西长屯至三呼庄一带(ZKQ1孔和ZK1孔之间), 且受到古河道制约。

(2)与该区域前期3个钻孔(ZKQ4孔、CGZ5孔、CGZ7孔)建立E→ W(海→ 陆)联合钻孔海侵追踪对比剖面, 表明该区MIS3海侵层位依次由滨海新区至静海区东尚码头的海相(CGZ7孔、CGZ5孔)→ 静海区的高家庄至西长屯西一带的过渡相(ZKQ4孔、ZKQ1孔)→ 静海区三呼庄的陆相(ZK1孔)相变, 推测该区MIS3海侵边界应在静海区的东尚码头村(CGZ5孔)和高家庄(ZKQ4孔)之间一带。

(责任编辑: 常艳)

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2020

0.0

... 0 引言2020年4月30日自然资源部发布的《2019年中国海平面公报》^[1]显示,1980#cod#x02014 ...

2019

0.0

... 《气候变化中的海洋和冰冻圈特别报告》^[2]评估了区域海平面上升对低海拔(#cod#x0003C ...

2020

0.0

... 10 m)沿海地区和社会的影响以及相关的风险^[3] ...

2020

0.0

... 国家海岸带和海洋地质计划认为,海岸带问题的解决需要向内陆扩展,向流域、山脉探寻地质作用根源^[4] ...

1978

0.0

赵松龄, 杨光复, 苍树溪, 等. 关于渤海湾西岸海相地层与海岸线问题[J]. 海洋与湖沼, 1978, 9(1): 15-25.

Zhao S

, Yang G

, Cang S

, et al. On the marine stratigraphy and coastlines of the western coast of the gulf of Bohai[J]. Oceanol Limnol Sin, 1978, 9(1): 15-25.

... 过程中的关键环节,是研究海侵和海平面变化的天然实验室,晚第四纪以来沉积地层中记录了具有古海岸线指示意义的3期海侵(自上而下依次为第1、2、3海侵层)^{[5,6,7,8,9,10,11,12,13,14]}和贝壳堤地质遗迹^{[15,16,17,18]} ...

1981

0.0

2008

0.0

王强, 张玉发, 袁桂邦, 等. MIS 3阶段以来河北黄骅北部地区海侵与气候期对比[J]. 第四纪研究, 2008, 28(1): 79-95.

Wang

, Zhang Y

, Yuan G

, et al. Since MIS 3 stage the correlation between transgression and climatic changes in the north Huanghua area, Hebei[J]. Quat Sci, 2008, 28(1): 79-95.

Based on the study of micropaleontology,palynostratigraphy,as well as the analysis of sedimentary structure and geochemistry of core samples collected from a total of four drilling holes located on the north Huanghua area,Hebei Province,the south side of the end of Bohai Bay,the present paper discusses the correlation between transgressions and palaeoclimatic changes,the determination of nearshore sea and tidal flat deposits in the transgression bed,and the influence of sedimentation on transgression and spore-pollen records since MIS 3 stage.The transgression bed which had been determined by using the appearance of certain marine microbiota,can be subdivided into nearshore sea,estuary,tidal flat,lagoon,distributary,backswamp,costal low land,interfluve-fluvial basin and other environments.Stratum yielding foraminifera and euryhaline ostracoda could not simply be considered as transgression or sea-level change caused by sea-water volume change,as the effects of regional riverine progradation and retrogradation,transportation of wind,water,and bird,and storm could not be excluded.Only the tidal flat and nearshore sedimentary unit in the transgression bed has relation to sea-water depth.The marine microbiota occurring at the strata formed above sea-level might be the thanatocenose transported by storm and other power or be the result of the shifting of river mouth towards the land under the setting of earth crust subsidence on the East China Great Plain.With the happening of transgression,sea region expanse,and summer monsoon strengthening,the vegetation on the source area had flourishing,so that the arbor free pollen occurred in transgression bed,which are certainly allochthonous deposits.Generally,a stratum with reduction setting has more spore-pollens than those with oxidation setting,but there was a special example in the studied area with abundant spore-pollen records in an weakly oxidative stratum.The Megathermal phase of Holocene epoch had been ended at about 5kaB.P.The sedimentary research,including the understating of synchronous heteropic facies as well as abrupt event sedimentation,is important for the study of Late Quaternary.

1. Tianjin Institute of Geology and Mineral Resouces, Tianjin 300170; 2. Institute of Technologic Method of Hydrogeology &|Engineering Geology, Academy Geologic Sinica of China, Baoding 071051

依据渤海湾顶南侧、河北省黄骅北部地区4个钻孔岩芯样品微体古生物学、孢粉地层学研究以及沉积构造与地球化学背景分析,讨论了该地区MIS3阶段以来海侵期与气候期对比、海侵层中潮坪与浅海沉积单元的判别、沉积作用对孢粉和海侵记录的影响。依据海相世系微体生物出现确定的海侵层,可分为滨岸浅海～河口湾、潮坪、泻湖、分支河道、边滩、滨海低地、河间地～洪泛盆地等不同环境;含有孔虫或广盐海相介形类的地层,除了局部河流进积～退积作用,尚不能排除风、水、鸟的搬运,包括风暴潮的影响,并非是与海水体积变化有关的海平面变化;海侵层中的潮坪～浅海沉积单元才与海水深度有关,其他海水之上形成的地层所见海相微体生物,是地壳沉降背景下风暴潮和其他动力搬运的埋葬群,与海面变化无关,甚至仅是在东部沿海大平原构造沉降背景下河口位置向陆地移动的结果;海侵的发生与海域的扩大以及夏季风强度增大,物源区植被状况好转,造成海侵层出现乔木花粉,但是为异地埋藏。一般说来,还原背景下的沉积地层孢粉记录丰富;弱氧化～弱还原背景下的沉积地层孢粉相对较少,但也可能出现孢粉丰富的特例,氧化背景下沉积地层孢粉更稀少,全新世大暖期结束于约5kaB.P.。沉积学研究,包括对同期异相和突发事件沉积作用的理解,对晚第四纪研究是十分重要的。

... 4 MIS3阶段海侵边界探讨对于第2海侵的发生时间存在争议,依据有机质¹⁴C测年,其时代为MIS3阶段^[7],王福等^[24]和商志文等^[25]第在#cod#x02161 ...

2009

0.0

2009

0.0

施林峰, 翟子梅, 王强, 等. 从天津CQJ4孔探讨中国东部海侵层的年代问题[J]. 地质论评, 2009, 55(3): 375-383.

Shi L

, Zhai Z

, Wang

, et al. Geochronological study on transgression layers of the CQJ4 borehole at Dagang area in Tianjin, China[J]. Geol Rev, 2009, 55(3): 375-383.

Magnetostratigraphic study at the CQJ4 borehole in Dagang area of Tianjin indicates that the Quaternary/Tertiary boundary (2.58 Ma) locates at depth of 340 m, and the base of the Middle Pleistocene series, corresponding to B/M boundary is located at 74 m. Microfossil analysis reveals three transgression layers in the CQJ4 borehole, which are at 4.2~12.0 m, 16.4~30.2 m, and 56.55~58.00 m, respectively. Comparing with data of the drilled boreholes in the Bohai coast, the three transgression layers should belong to “Transgression Layer Ⅰ, Ⅱ, Ⅲ” from new to old in time. Four geomagnetic excursion events in Brunhes normal chron are recorded in the CQJ4 core sediments, which could be correlated to Blake (120~110 ka), Jamaica (215~205 ka), Calabrian Ridge 1 (325~315 ka), and Calabrian Ridge 2 (525~515 ka), respectively. Based on the age of geomagnetic excursion events and the correlation of magnetic parameters of CQJ4 borehole and ODP 677 oxygen isotope proxy, the three transgression layers are correlated to “Transgression Layer Ⅲ, Ⅳ, Ⅴ” in Chinese coastal plains, respectively. This correlation is conflicted with the general consideration of three transgression ages in the Chinese coastal plains which is clearly difficult to solve the problem of very low sedimentation rate between the base of Late Pleistocene (depth at 58m) and the B/M boundary (depth at 74m).

天津CQJ4钻孔磁性地层研究结果表明，该孔第四系底界（2??58Ma）位于340m处，中更新世底界, 即B/M界线位于74m处。微体生物分析显示该孔岩芯记录了三个海侵层，分别位于4??2~12??0m、16??4~30??2m和56??55~58??00m，与渤海湾西岸其他钻孔对比，这三期海侵对应于“第Ⅰ、Ⅱ、Ⅲ海侵层”。古地磁研究表明布容极性期内该孔记录了4次极性漂移，分别对应于Blake（120~110ka）、Jamaica（215~205ka）、Calabrian Ridge 1（325~315ka）和Calabrian Ridge 2（525~515ka）。结合钻孔岩芯磁性参数与深海氧同位素的对比，推测这三个海侵层的年龄分别为120~70ka、240~180ka和500ka左右，可以与中国东部沿海地区的“第Ⅲ、Ⅳ、Ⅴ海侵层”相对应。这一对比方案与目前较普遍接受的沿海平原晚更新世以来三期大海侵的认识，在层位对比上明显冲突，但“晚更新世以来三期大海侵”之说，尚难以解释晚更新世底界与中更新世底界（B/M界线）过近的问题。

... 第四系底界埋深约在130~340 m^[9,13,14] ...

2011

0.0

胥勤勉, 袁桂邦, 张金起, 等. 渤海湾沿岸晚第四纪地层划分及地质意义[J]. 地质学报, 2011, 85(8): 1352-1367.

Xu Q

, Yuan G

, Zhang J

, et al. Stratigraphic division of the Late Quaternary strata along the coast of Bohai Bay and its geology significance[J]. Acta Geol Sin, 2011, 85(8): 1352-1367.

This paper divides the late quaternary strata along coast of Bohai bay, and discusses its Lithofacies Paleogeography and Neotectonic characteristics, based on lithology and sedimentary texture of 4 boreholes penetrated the late quaternary stata, with 14C ages of peats and humus mud, micropaleontology and palynology, and the theory of climatic stratigraphy and sequence stratigraphy. There ara nine units, corresponding respectively Marine Isotope Stage 5e (MIS5e), MIS5d、MIS5c、MIS5b、MIS5a、MIS4、MIS3、MIS2 and MIS1 in ascending order.Transgressions have occurred in MIS5e、MIS5c、MIS3 and MIS1. Marsh and interfluve and lagoon have been formed when MIS5e because of river action equivalent to sea action. Interfluve and river and sand bank-lagoon have been formed when MIS5c because of river action better than sea action. Marine sediment thickness of 7-8m has been formed when sea level rising in early stage of MIS3, and then river and sand bank and lagoon have been formed when sea level falling in late stage of MIS3 because of river action strengthening. Marine sediment thickness of 10-15m has been formed in north and west coast, lagoon sediment thickness of 3m has been formed in south coast. The ancient Yellow river deltas have prograded form the south to north in coast of Bohai bay.The hard clay and interfluves have been formed when sea level falling in MIS5d、MIS5b and MIS2. Marsh have been formed during the last deglaciation because of sea level rising.Differential subsidence is a mainly characteristics along coast of Bohai bay during the late quaternary. The differential subsidence rate of the southern Huanghua depression and Chengning uplift reaches 0.16mm/a, and the differential subsidence rate of the northern and middle in Huanghua depression reaches 0.31mm/a.The period of tectonically activity happened in MIS5c.

本文以四个钻透上更新统钻孔为例，以岩性和沉积构造为基础，采用14C、微体和孢粉等分析方法，结合气候地层和层序地层学的理论，对渤海湾晚第四纪地层进行了划分，讨论了岩相古地理和新构造特征。共划分了9组地层，自下而上分别为海洋氧同位素5e（MIS5e）、MIS5d、MIS5c、MIS5b、MIS5a、MIS4、MIS3、MIS2和MIS1阶段地层。MIS5e、MIS5c、MIS3和MIS1时期发生海侵。MIS5e海侵时，河流堆积作用和海侵作用相当；MIS5c海侵时，海侵作用增强，但河流堆积作用更大，多形成河流相。MIS3海侵时，海侵作用较强，形成厚7-8m海相层，海平面下降时，河流堆积作用增强。MIS1海侵时，北岸和西岸作用最强，形成厚10-15m的海相层；南岸河流堆积作用较强，仅形成3m的?湖相。MIS5d、MIS5b和MIS2时期，海平面较低，多形成硬黏土和河间洼地。MIS2的冰消期，多形成泛滥的沼泽洼地。渤海湾晚第四纪差异沉降明显，南岸黄骅坳陷比埕宁隆起差异沉降速率达0.16mm/a，黄骅坳陷北部和中部比中部差异沉降速率达0.31mm/a。MIS5c为主要构造活动期。

... 依据地层和气候特征,其时代为MIS3阶段^[10] ...

2012

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陈永胜, 王宏, 裴艳东, 等. 渤海湾西岸晚第四纪海相地层划分及地质意义[J]. 吉林大学学报: 地球科学版, 2012, 42(3): 747-759.

Chen Y

, Wang

, Pei Y

, et al. Division and its geological significance of the Late Quaternary marine sedimentary beds in the west coast of Bohai Bay, China[J]. J Jilin Univ (Earth Sci Ed), 2012, 42(3): 747-759.

Two 80 meters deep boreholes (BT113 and BT114) were carried in the west coast of Bohai Bay in order to clarify the revolution of sedimentary environments. Three marine sedimentary beds were identified based on sediment composition and texture, faunal assemblages (mollusk, benthic foraminifera and ostracoda) as well as AMS 14 C and OSL ages. According to their order, from bottom to top, they are interpreted as Marine Bed 3 (M3) deposited in the Later Mid-Pleistocene, Marine Bed 2 (M2) in the Late Pleistocene and Marine Bed 1 (M1) in the Holocene. These marine beds, from M3 to M1, reveal three major sea level movements since the Late Mid-Pleistocene. M3, M2 and M1, corresponding to marine facies deposited in MIS (marine isotope stage) 7, MIS5, and MIS1, respectively, indicate the repeated highstands during those periods. Therefore, it can be conclude that the development of these marine beds recording the regional sea level trends in the west coast of Bohai Bay, is well accordant with the global change. Different from the previous studies, authors consider that the marine transgression which controlled sea water to intrude into the Bohai Sea did not impact the studied area during MIS3 due to the relative lowstand and shallow topography of Bohai Strait. Contrastive analysis of multi boreholes indicates that the three marine beds are distributed widely and comparable well in the west coast of Bohai Bay. Changeable elevation and thickness of the marine beds within different boreholes imply that there have happened differential depressional movements during the Late Pleistocene period.

1.College of Earth Sciences, Jilin University, Changchun130061, China; 2.Tianjin Centre of China Geological Survey, Tianjin300170, China

BT113孔和BT114孔是位于渤海湾西岸地区的2个80 m全取心钻孔。通过对钻孔岩心的岩性、沉积构造及生物组合等特征分析，结合AMS 14 C和OSL（光释光）测年结果，揭示中更新世晚期以来本地区主要发育3个海相地层：自下而上为中更新统上部的第三海相地层（简称“海三”）、上更新统的第二海相地层（简称“海二”）和全新统的第一海相地层（简称“海一”），指示中更新世晚期以来研究区发生的3次主要海面波动。与全球海面变化曲线对比，海三，海二和海一分别发育于MIS（深海氧同位素阶段）7、MIS5和MIS1的高海面时期，说明渤海湾西岸中更新晚期以来地层记录的海面变化趋势与全球变化一致。与前人的传统认识不同，认为受全球海面及渤海海峡地貌共同影响，MIS3时期研究区并未发生大范围海侵。通过多个钻孔的对比分析，3个海相地层在渤海湾西岸地区的分布较广，具有良好的可对比性，不同钻孔之间同一海相地层的高程和厚度的较大差异指示本地区在晚更新世期间发生较强的差异性沉降活动。

2017

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2018

0.0

... 第四系底界埋深约在130~340 m^[9,13,14] ...

... 陆)区域联合钻孔对比剖面(图3),对第2海侵边界进行追踪,MIS3海侵层位稳定^[13,14] ...

2020

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... 第四系底界埋深约在130~340 m^[9,13,14] ...

... a BP(表1),该研究青县滕庄子ZKT1孔^[14]在25 ...

... 陆)区域联合钻孔对比剖面(图3),对第2海侵边界进行追踪,MIS3海侵层位稳定^[13,14] ...

2007

0.0

王强, 袁桂邦, 张熟, 等. 渤海湾西岸贝壳堤堆积与海陆相互作用[J]. 第四纪研究, 2007, 27(5): 775-786.

Wang

, Yuan G

, Zhang

, et al. Shelly ridge accumulation and sea-land interaction on the west coast of the Bohai bay[J]. Quat Sci, 2007, 27(5): 775-786.

On the muddy west coast of the Bohai Bay, two kinds of sandy bodies have been discovered. The first is the offshore bar formed in underwater area initially, which afterward under marine dynamic effect gradually accumulated on the inter-tidal zone and on the land with shoreline progradation. The other is the widespread shelly ridge (chenier). The initial shelly ridge is formed when the coast enters into its weak erosion phase. The present paper reports that when the shoreline progressing and sea-land interaction are stable, under the effect of wind- and wave-landward, the sandy body of the initial shelly ridge could be formed near the shoreline. Shelly accumulation on the coast in the studied area includes three types: The shelly ridge on the front margin of the abandoned delta lobe; the storm shelly accumulation on the head of tidal river gulf and/or the outer side of tidal channel (the shell could accumulate from the underwater area of channel to the low land continuously); irregular shelly accumulation on the low delta plain under the setting of spring tide or storm weathers. The shelly ridge includes the instantaneous/episodic high energy accumulation and that under the comprehensive activity of spring and wind-landward. The shelly ridge could not be used to interprete sea-level change because the shell dating and the system of beds in shelly ridge have shown that the formation process of shelly ridge is a complex re-accumulation. In the highly disturbed progressing process of the delta, the irregular shoreline could be formed. The effect of wind- and wave-landward for different topographic shoreline parts could thus cause the formation of shelly ridge which is unparallel to modern shoreline. Terminology of shelly ridge has been used at random, causing the study of shoreline change a simplified one. To use rigorous concept of shelly ridge, the deltaic lobe change could be precisely subdivided when event deposits have been excluded. When the study of shelly ridge is combined with the dating of delta top peat, the formation process of muddy coast could be precisely reconstructed.

①Tianjin Institute of Geology and Mineral Resources, Tianjin 300170; ②The Fourth Team of Hydrological and Engeneering Geology, Hebei Bureau of Geo-exploration, Cangzhou 061000; ③Marine Information Centre, National Marine Bureau, Tianjin 300171; ④College of Marine Geoscience, Ocean University of China, Qingdao 266003

渤海湾西岸淤泥质海岸已见两类砂体,滨外坝先形成于水下,而后随着海岸进积和在海洋动力作用下,逐渐出露于潮间带和陆地上; 另一种普遍出现的是具沿岸堤意义的贝壳堤,而且是在海岸进入弱侵蚀期即形成。研究发现,在海岸进积和海-陆相对稳定条件下,海岸线附近中潮坪-高潮坪受向岸风和波浪作用也可形成雏形贝壳堤砂体。目前研究区海岸上的贝壳堆积有3类,即:风暴潮堆积的沿岸堤型贝壳堤,主要堆积在中潮坪-高潮坪-滨海低平原上; 潮沟~潮汐河道型"贝壳堤",为潮汐河口湾顶或潮道外侧风暴贝壳堆积(自潮汐通道水下堆积延续到低地); 以及沿海低平原在大潮或风暴潮天气背景下出现的无序贝壳堆积。贝壳堤堆积既有风暴潮大浪瞬时、高能幕式堆积,又有大浪、向岸风综合作用下堆积的可能,贝壳测年及贝壳堤层序表明其形成是复杂的再堆积过程,不宜解释为海平面变化。在三角洲不均衡推进过程中,有可能形成不规则的海岸线,向岸风浪对不同地貌岸段的作用,可导致形成并非与现代海岸线平行的贝壳堤。贝壳堤术语的随意使用,已经造成海岸线变迁研究的简单化。严格使用沿岸堤的贝壳堤概念,可进一步划分三角洲叶瓣变迁,但是事件堆积必须剔除。将贝壳堤的研究与三角洲顶面泥炭测年相结合,可能更精确重塑海岸形成过程。

... 受全球性气候变化引起的海平面波动和岸线的频繁迁移,研究区第四纪以来历经海陆的变化,形成了海相和陆相沉积物交替出现的地层以及贝壳堤遗迹^{[15,16,17,18]},为海侵事件、海岸线变迁及海面变化等研究提供了天然的理想实验室 ...

2011

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2012

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岳军, Dong Y张宝华, 等. 渤海湾西岸的几道贝壳堤[J]. 地质学报, 2012, 86(3): 522-534.

Yue

, Dong

, Zhang B

, et al. A few of barrier sand -bars on the west coast of Bohai Bay[J]. Acta Geol Sin, 2012, 86(3): 522-534.

There are 6 Barrie Sand-bars are outcropped or buried on the west coast of Bohai Bay. Based on the geological survey, it is found that the plane distribution features texture of the Barrie Sand-bars, which are from the old to the new are roughly parallel with the coast along the west coast of Bohai Bay (from the coast to the sea).The distribution of the Barrie Sand-bars can be divided into two kinds, one is from the new to the old, and the other one is from the old to the new. In this paper, the division of the Barrie Sand-bars fromⅠ(old) to Ⅵ (new) by using the latter one. Through the description of the material composition and the accumulation characteristics to each Barrie Sand-bar (figure. 2 to figure. 7), conducting the mathematical statistics for the geometrical morphological features (table 2), comparing analysis the formation age features and the division scheme (table 3), summing up the biological assemblages (table 1), the result reveal the occurrence, formation age and the tidal level change of the Barrie Sand-bars fromⅠto Ⅵ (figure. 8). In the basis of the Barrie Sand-bars as a particular geological carrier, the author try to analysis and reveal the genetic mechanism in a macroscopic view, and consider that the generalized Bohai Sea is inland semi-lagoon or local sea in reality. (table. 4 figure. 9) Shangdong Miaodao Island and Liaodong Peninsula constitute barrier coast for Bohai Sea. After comparing analysis to massive data, the barrier coast is an only essential condition to form kebohe delta and beaked delta, both of which may be a possibility condition to form barrier bars (barrier island, barrier beach) or shell ridges. This result is just main genetic mechanism for the shell ridges.

渤海湾西岸出露或埋藏了多道贝壳堤，通过地质调查发现：贝壳堤的平面分布结构是沿着（或随着）渤海湾海岸由老至新（从岸―海）与海岸呈大致平行排列。贝壳堤的划分方案有两种，一种是从新至老，另一种是从老至新，本文采取后一种划分方法：即第Ⅰ道（老）―第Ⅵ道（新）贝壳堤。在此本文对每道贝壳堤的物质（岩性特征）组成与堆积特征进行了描述(图2―图7)；对贝壳堤的几何形态特征进行了数理统计（表2）；对贝壳堤形成的年代特征进行了对比分析（表3）；对贝壳堤的生物组合特征等资料进行了归纳和整理；对贝壳堤的分道方案进行了对比分析（表1），揭示了贝壳堤的赋存状态、形成的年代、及第Ⅰ道―第Ⅵ道贝壳堤所处的潮位变化（图8）。从形成贝壳堤这一独特的地质载体为基础，试图从渤海湾宏观整体的角度分析并揭示贝壳堤的成因机制（表4，图9），笔者认为广义的渤海湾是内陆的半泻湖（海），也可以视为局部海：山东庙岛列岛―辽东半岛构成了渤海的障壁海岸，在障壁海岸这样的自然地理和地貌条件下，通过大量的资料综合分析认为：只有障壁海岸才是形成：“科珀河型三角洲与喙状三角洲”必然条件，而“科珀河型三角洲与喙状三角洲类型”等是形成障壁砂坝（障壁岛，障壁滩）―贝壳堤的或然条件，这就是贝壳堤成因的主要机制。

2016

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... 对于全新世海侵边界(第1海侵层)追踪探讨已有相关研究: 李凤林^[18]根据微地貌、微体古生物、考古学、地层及年代学进行地层对比,圈定了渤海湾西岸全新世海侵最大边界 ...

2012

0.0

... 方晶等^[19]通过钻孔黏土混浊水电导率,结合贝类及有孔虫鉴定等,探讨了天津市西南全新世最大海侵的特征 ...

2015

0.0

刘艳霞, 黄海军, 董慧君, 等. 渤海西南岸全新世最大海侵界线及其地貌特征[J]. 第四纪研究, 2015, 35(2): 340-353.

Liu Y

, Huang H

, Dong H

, et al. Geomorphic characteristics and location of the maximum Holocene transgression boundary in the southwestern coast of the Bohai sea[J]. Quat Sci, 2015, 35(2): 340-353.

Based on Ground Penetrating Radar (GPR) field measurements and the sedimentological facies log, we have carried out investigations in the neighborhood of eight boreholes located the southwestern coast of the Bohai Sea. The locations, configurations and altitudes of five marine facies deposits of the pinch-outs (boreholes ZK303, HN73, YS1, BDK1 and GZ2) formed during the maximum Holocene transgression period have been obtained by a comparative analysis between GPR image and borehole record. The geomorphologic characteristics of coastal sedimentary have been discussed in study area during the maximum Holocene transgression period. The results show that widely delta tidal flat had been formed from Xiaoqing River in Shandong Province to Zhangweixin River, the transgression range was far away from the shoreline in this region. However, lagoon-sandbar was major landform in the vicinity of Huanghua and Cangzhou in Hebei Province, suggesting that the transgressive boundary gradually moved to the sea. From the relationship between the historical courses of Huanghe River shifts and the distribution of shell cheniers during three period (6ka B.P., 2ka B.P. and recent years), it is revealed that cheniers formation and delta progradation are related in the plain of the Huanghe River Delta in the vicinity of boreholes HN73(37°39'13.32"N, 117°53'27.32"E) and YS1(38°06'06"N, 117°28'12"E). However, it originated from a longshore sand bar evolution process which meanwhile was subject to storm surge in the southwestern coast of Bohai Bay near the BDK1(38°19'53.44"N, 117°24'47.98"E) and GZ2(38°27'03"N, 117°05'34"E). In the southern coast of the Laizhou Bay, it is inferred that there were similar characteristics of coastal geomorphology before and after the maximum Holocene transgression era as the modern coast location is compared the positions of buried ancient channel and lake, and in that time the shoreline almost was consistent with the transgression range. By using topographic correction to the GPR images, we conclude that ancient sea water could have arrived at a proximity 5.8~10.3m elevation region in study area. this altitude difference of marine transgression of pinch-out in different area serves to cause a neotectonic movement, which likely provide valuable baseline for estimating sea level change.

1 Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071; 2 Dongying Institute of Surveying and Mapping, Dongying 257091; 3 Guangdong Ocean University, Zhanjiang 524000

结合钻孔与探地雷达探测古海相层尖灭点的测量方法与图像处理原则,本研究在沿渤海西南岸分布的8个相关钻孔附近开展了探测,经图像处理、与钻孔对比分析以及在特征位置钻探浅钻的方式,获得了5处最大海侵尖灭点的位置、地层剖面形态以及高程等信息.结合6ka B.P.、2ka B.P. 左右和现代黄河流路变迁史及沿岸贝壳堤分布情况,揭示了最大海侵时期小清河向北至漳卫新河范围主要为古黄河形成的广阔三角洲潮滩地貌,海侵线远离海岸线深入内陆,其上的贝壳堤形成主要与黄河流路变迁相关; 而渤海湾西南岸黄骅、沧州附近及以北主要为沼泽-潟湖-沙坝海岸地貌特征,海侵线由潟湖的陆侧边缘向海逐渐推进,沿岸分布的6ka B.P. 左右贝壳堤的形成则是基于沿岸堤,并伴随风暴作用发育而来.莱州湾南岸依据埋藏古河道古湖泊的分布情况,推断该区全新世最大海侵前后具有与现代相似的海岸地貌特征,海侵时,海水直抵当时最大高潮线附近,使得海岸线与海侵线几乎相当.依据剖面地形校正结果可知,最大海侵时,海水侵入内陆至现代地表高程5.8~10.3m范围,后期新构造运动造成的隆起与下沉的区域差异,使得不同区域海侵层高程发生相应的变化,该结果为进一步估算海平面变化提供重要基础.

... 刘艳霞等^[20] 结合钻孔与探地雷达的测量方法探测了渤海西南岸全新世最大海侵界线 ...

2008

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... 重力资料^[21]显示,该断陷盆地存在NE向隆坳相间的构造格架,分别为冀中坳陷、沧县隆起和黄骅坳陷3个#cod#x02162 ...

1992

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... 坳陷区和隆起区新生界底界埋深分别为3~4 km和1~2 km^[22] ...

2013

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... 树轮校正所用曲线为IntCal13 atmospheric curve^[23],所用程序为OxCalv4 ...

2014

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... 4 MIS3阶段海侵边界探讨对于第2海侵的发生时间存在争议,依据有机质¹⁴C测年,其时代为MIS3阶段^[7],王福等^[24]和商志文等^[25]第在#cod#x02161 ...

2016

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... 4 MIS3阶段海侵边界探讨对于第2海侵的发生时间存在争议,依据有机质¹⁴C测年,其时代为MIS3阶段^[7],王福等^[24]和商志文等^[25]第在#cod#x02161 ...

2006

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阎玉忠, 王宏, 李凤林, 等. 渤海湾西岸晚更新世沉积的差异性特征[J]. 第四纪研究, 2006, 26(3): 321-326.

Yan Y

, Wang

, Li F

, et al. Different depositional processes of boreholes BQ1 and BQ2 in the Late Pleistocene on the west coast of Bohai Bay[J]. Quat Sci, 2006, 26(3): 321-326.

Borehole BQ1, ca.95.6m in depth, is located in the Qikou Hollow Zone, a secondary subsiding unit of the Huanghua Depression Basement Tectonics, west Bohai Bay. Borehole BQ2, ca.32.8m in depth and 18km away from the BQ1, is drilled in the Dagang Palaeo Buried Hill Belt, a secondary salient unit, in the same Depression. Multidisciplinary studies including lithology (grain size, nodules, colour and facies analysis), palaeontology (molluscs, foraminifera and ostrocoda), chronology (OSL and AMS 14 C) and palaeomagnetism (intensity, inclination, declination and susceptibility), etc. have been carried out. A number of terrestrial layers and marine layers, including transitional layers, are recognized, stratigraphically as the Marine Bed Ⅰ, Terrestrial Bed Ⅰ, Marine bed Ⅱ, Terrestrial Bed Ⅱ, and Marine Ⅲ,… from top downwards for the two cores. A major result reveals that there existed obvious differences on composition, thickness and burial depth of the same layers of the two cores in the Late Pleistocene Period. (1) 80~60kaB.P. , the Terrestrial Bed Ⅱ. In BQ1 it consists of fine sand and silt deposited in alluvial-floodplain-shallow lake environment, with frequent hiatuses; in BQ2 it is composed of clay and silt in floodplain environment. The top of the bed in BQ1 is 16.6m lower than in BQ2 and the thickness of the bed in BQ2 is only one fourth of that in BQ1. (2) 60~35kaB.P. , the Marine Bed Ⅱ. It is intertidal laminated silt and clay or massive mud in bay environment in BQ1 while it is composed of brackish sediments of transitional facies in BQ2. The top and bottom of the bed in BQ1 are 11.5m and 16.5m lower, respectively than in BQ2, while the thickness of the bed in the latter is only a half of that in BQ1. (3) 35~20kaB.P. , the Terrestrial Bed I. During that period, the subsiding unit was a water catchment area and thus the bed in BQ1 consists of well sorted channel sand. That in BQ2 is composed of flooding clay and silt with calcium carbonate nodules, palaeosols and hiatuses. The top and bottom of the bed are 3.9m and 11.5m lower in BQ1 than those of BQ2 and the thickness in BQ2 is only one third of BQ1. (4) 20~10kaB.P. , the Hiatus. It was the Last Glacial Maximum and almost nothing had been deposited in either cores. (5) After 10kaB.P. , the Marine Bed Ⅰ. The thickness of the bed is 13.77m and 13.07m respectively in BQ1 and BQ2 with the similar depositional rates. During 8.6~7.9kaB.P. (uncalibrated AMS 14 C dates), the bottoms of the same layers in two cores are almost at the same level which suggests that the different patterns of depositional process were faded out, and the development of the Holocene coastal plain started with identical tectonic and depositional background.

①Tianjin Centre, China Geological Survey, Tianjin 300170; ②College of Earth Sciences,Jilin University,Changchun 130061

位于渤海湾西岸黄骅坳陷的次级构造单元歧口凹陷的BQ1孔,深95.6m;位于相邻次级凸起单元北大港潜山构造带的BQ2孔,深32.8m。两孔相距约18km。对岩性、古生物(有孔虫、介形虫和软体动物)、测年(OSL和AMS 14 C)和古地磁等基础数据的研究表明,两孔中可资对比的晚更新世海相层和陆相层具明显的差异性空间分布特征。其中,晚更新世60~35kaB.P.的第2海相层(Ⅱ海)在凹陷区BQ1孔厚约10.7m、在凸起区BQ2孔厚5.7m;BQ1孔该海相层顶、底板埋深分别比BQ2孔低约11.5m和16.5m。其他相同层位,同样表现出类似的空间位置(厚度、埋深)的差异。进入全新世,两孔第1海相层(Ⅰ海)的底板位于相同埋深,暗示至此差异性沉积过程趋于平缓,两孔所在地区在相对平稳的构造与沉积背景下开始了全新世滨海平原的近现代造陆过程。

... 而依据光释光(Optically Stimulated Luminesecence,OSL)测年,其时代可能为MIS3或MIS5^{[26,27,28,29]} ...

2008

0.0

陈宇坤, 李振海, 邵永新, 等. 天津地区第四纪年代地层剖面研究[J]. 地震地质, 2008, 30(2): 383-398.

Chen Y

, Li Z

, Shao Y

, et al. Study on the Quaternary chronostratigraphic section in Tianjin area[J]. Seismol Geol, 2008, 30(2): 383-398.

Based on the optical dating and paleomagnetic testing results,we make a chronostratigraphic research of Huanghua depression and Cangxian uplift which are two tectonic units of Tianjin area.In this paper,we establish a Quaternary stratigraphic section and make a new division of the Quaternary strata.The result shows that the two tectonic units have similar sedimentation histories,but many differences exist.On the one hand,both units have received transgression since the Quaternary and some marine strata formed to various extents,which indicates different transgression sedimentation histories between them;on the other hand,the Quaternary stratigraphic sequences of the two units are greatly different,indicating different sedimentation histories,and consequently,the type and thickness of sediments are obviously different,so they belong to different sedimentary units.The study also shows the depths of bottom interfaces of Holocene,upper Pleistocene and middle Pleistocene as 19m,45m and 103m,respectively in hole BZ1 in Huanghua depression and 13m,30m and 56m respectively in hole BZ2 and hole TN3 in Cangxian uplift.The depth of bottom interface of the Quaternary is about 162m,much smaller than the result of the previous Quaternary strata division.

Earthquake Administration of Tianjin Municipality, Tianjin 300201, China

通过钻孔岩心光释光测年与古地磁测试,对天津地区黄骅坳陷和沧县隆起两个构造单元的年代地层进行了研究,对区内第四纪分层界线重新进行了划分,建立了本区第四纪年代地层剖面。黄骅坳陷和沧县隆起两个构造单元的沉积发展历史具有一定相似性,同时还存在较大的差异。主要表现在:第四纪以来,黄骅坳陷和沧县隆起均有海侵发生,沉积一些海相地层,但是其发育程度不同,反映两个构造单元有着差异较大的海侵历史;二者在第四纪年代地层序列上存在较大差异,形成的相应沉积物的类型和厚度明显不同,为两个不同的第四纪沉积单元;天津地区原来第四系内部的分层界线为:Q h 埋深20m,Q p 3 为70～80m,Q p 2 为180～210m,Q p 1 为400m。研究表明,天津地区的第四系在黄骅坳陷和沧县隆起上明显不同:黄骅坳陷中的全新统、更新统上段及中段底界深度约分别为19,45,103m,第四系底界深度>200m;沧县隆起上的全新统、更新统上段及中段底界深度分别为13,30,56m,而第四系底界埋深为162m左右,远远浅于原来第四系分层的界线。

... 而依据光释光(Optically Stimulated Luminesecence,OSL)测年,其时代可能为MIS3或MIS5^{[26,27,28,29]} ...

2013

0.0

... 而依据光释光(Optically Stimulated Luminesecence,OSL)测年,其时代可能为MIS3或MIS5^{[26,27,28,29]} ...

2016

0.0

... 而依据光释光(Optically Stimulated Luminesecence,OSL)测年,其时代可能为MIS3或MIS5^{[26,27,28,29]} ...

2003

0.0

施雅风, 于革. 40-30 ka B. P. 中国暖湿气候和海侵的特征与成因探讨[J]. 第四纪研究, 2003, 23(1): 1-11.

Shi Y

, Yu

. Warm-humid climate and transgressions during 40-30 ka B. P. and their potential mechanisms[J]. Quat Sci, 2003, 23(1): 1-11.

The period of 40～30ka B.P. should be corresponding to the later phase of the mega-interstadial of the last glacial period (75～10ka B.P.) or to the later phase of Marine oxygen Isotope Stage 3 (i.e. MIS 3a). Previous palaeocilmate studies based on ice cores, lake and river sediments, pollen and macrofossils, paleosol from loess and desert sections, stalagmites from karst caves, and sea level changes indicated that precipitation and humidity during 40～30 ka B.P. were higher than those today, particularly in the Tibetan Plateau and northwestern areas of China. Also, temperature in that period was significant higher than the present's in West China and the South China, but numerous palynological studies suggested that temperature was slightly lower than that today from Northeast China to the Changjiang (Yangtze) River valley. The increased precipitation would have important effects on the convergence of inland water systems and on the catchment change of the Changjiang River and the Yellow River. Large transgressions occurred in the western coasts of the Bo Hai and the delta areas of the Changjiang River and the Pearl River, where the sea level at that time was 8～10m lower than the present sea level. A higher July-insolation in the mid and low latitudes than today occurred during the period 40～30ka B.P., which was mainly due to changes in the perihelion of the orbital parameters. This insolation anomaly was possibly a major dynamics that caused the warm-humid climate and the transgressions in China. The strong heat energy would shrink the icesheets in the high latitudes and hence rise the sea levels globally. The hot low pressure enhanced over the Tibetan Plateau would induce monsoon airflow from the ocean and increase precipitation. The increased heat-evaporation cycling in the low-mid latitude oceanic area would lead to enhancing of summer monsoon. The reduced icesheets in the high-latitude would decrease the high-latitude cooling and make the Westerly more active than today. These combined effects would increase precipitation and temperature over China. High-resolution records of Guliya Ice Core from the Tibetan Plateau and stalagmites from Hulu karst cave in Nanjing revealed many century-scale climate fluctuations, suggesting that the climate during 40～30 ka B.P. should not be a stable warm-humid period. A more realistic climate sequence and a better understanding of the mechanisms will rely still on more high-resolution studies in the future.

①Institute of Cold and Arid Regions Environmental and Engineering Research, Chinese Academy of Sciences, Lanzhou 730000; ②Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008

40～30kaB.P.相当于末次冰期(75～10kaB.P.)中的大间冰阶或海洋氧同位素第3阶段的晚期(MIS3a),已有测年记录的冰芯、湖泊沉积、孢粉与古生物、黄土与沙漠地区古土壤、石灰岩洞穴中石笋、古河道沉积、滨海地区海相沉积等7种记录指示我国各区域的湿润程度即降水量高于现代,青藏高原和西北地区尤为显著.西部和华南地区的温度明显高于现代,但较多的孢粉研究者认为东北、华北和长江流域的温度略低于现代.降水量的增加对内陆水系的合并和外流的黄河和长江流域等产生重大影响.渤海西侧、长江三角洲南北与珠江三角洲南部出现重大海侵,当时海平面高度仅低于现代海平面8～10m.当时暖湿气候与海侵的主要动力是岁差周期导致的中、低纬度太阳高辐射所提供的热力促使冰盖消融萎缩,海洋扩涨,青藏高原热低压增强,吸引季风降水,中、低纬度区海洋加热蒸发,增强夏季风与西风环流的水汽含量导致我国全境暖湿.高分辨率的西昆仑山古里雅冰芯记录和南京汤山洞穴石笋记录表明气候有许多百年级高频振荡波动,不是稳定暖湿,要作更深入研究才能说明其表现和影响.

... 5万区调项目等20多个钻孔中,获得样品的AMS ¹⁴C测年均在22~40 ka BP(表2),可以笼统称为40 ka BP以来沉积^[30],应属于MIS3阶段 ...