内蒙古横峦山组类高镁安山岩年代学及地球化学特征

doi:10.19388/j.zgdzdc.2018.05.08

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摘要横峦山组火山岩主要分布在红柳河—牛圈子—洗肠井缝合线南部红山头一带。通过锆石同位素测年及岩石地球化学分析等方法对横栾山组火山岩进行研究,结果显示: 该组火山岩富集LREE,亏损HREE,无明显的负铕异常,稀土配分形式与日本Setouchi火山岩带中典型高镁安山岩类似。此外,该火山岩具较高的MgO含量(2.85%~4.13%)和较低的FeO^T/MgO比值( FeO^T/MgO=0.75~1.2<1.5),Al₂O₃含量介于5.59%~17.15%,CaO含量小于10% (5.97%~8.30%)。其岩石地球化学具有类高镁安山岩的特征,因此认为横峦山组火山岩形成于北山洋早期洋壳俯冲环境。横峦山组火山岩的锆石U-Pb测年结果为(453.5±2.7) Ma,代表着北山地区在晚奥陶世早期北山洋已经开始发生俯冲。

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	杨鑫朋
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关键词 ：横峦山组, 地球化学特征, 锆石U-Pb年龄, 高镁安山岩

Abstract：Hengluanshan Formation volcanic rocks mainly distribute in the Hongshantou area, which is located in the south of Hongliuhe-Niujuanzi-Xichangjing suture belt. The authors researched Hengluanshan Formation volcanic rocks through zircon isotopes dating and geochemical analysis. The results show that the volcanic rocks are rich in LREE, lack HREE, and have not significantly negative europium anomaly. The REE patterns of the volcanic rocks are similar to the typical high-magnesium andesite of the Setouchi volcanic belt in Japan. There is higher MgO content (2.85% to 4.13%) and lower FeO^T/MgO value (0.75 to 1.2, less than 1.5) in the volcanic rocks. The Al₂O₃ content is from 5.59% to 17.15%, and the CaO content is less than 10% (5.97% to 8.30%). The volcanic rocks have the geochemical characteristics of analogy high-magnesium andesite. So, the authors considered that Henluanshan Formation volcanic rocks formed at the early stage of Beishan oceanic crust subduction. The zircon U-Pb age of Henluanshan Formation volcanic rocks is (453.5±2.7) Ma, and it indicates that Beishan ocean subducted at the early stage of Late Ordovician.

Key words： Henluanshan Formation geochemistry U-Pb zircon age high-magnesium andesite

收稿日期: 2018-02-05

中图分类号:	P588.144
	P597.3
	P595

基金资助:中国地质调查局“内蒙古1:5万基东等四幅区域地质矿产调查(编号: 12120113056500)”项目资助

作者简介: 杨鑫朋(1990—),男,助理工程师,主要从事区域构造与构造动力学研究。Email: yangxinpeng1101@163.com。

引用本文:

杨鑫朋, 田粉英, 王硕, 张金龙, 张立国. 内蒙古横峦山组类高镁安山岩年代学及地球化学特征[J]. 中国地质调查, 2018, 5(5): 58-65.
YANG Xinpeng, TIAN Fenying, WANG Shuo, ZHANG Jinlong, ZHANG Liguo. Geochronological and geochemical characteristics of analogy high-magnesium andesite in Henluanshan Formation of Inner Mongolia. , 2018, 5(5): 58-65.

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http://www.zgdzdcbjb.com/CN/10.19388/j.zgdzdc.2018.05.08 或 http://www.zgdzdcbjb.com/CN/Y2018/V5/I5/58

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