Geochemistry, LA-ICP-MS Zircon U-Pb Dating and Geological Significance of Middle Cambrian Monzogranite in Yichun, Heilongjiang Province
NIU Yan-hong1, WANG Xing1, LI Xu-dong1, YANG Bo2, NIU Wen-zhi2, WANG Bing1
1. Qiqihar Branch of Heilongjiang Institute of Geological Survey, Harbin, Heilongjiang 150036, China; 2. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
Abstract：LA-ICP-MS zircon U-Pb age of 504.1±5.4Ma was obtained for the fine-medium grained monzogranite from southern Yichun, which suggests the monzogranite formed in Middle Cambrian. Geochemical data for the monzogranite reveal K2O+Na2O contents of 7.41%~8.70%, K2O/Na2O ratios of 1.80%~2.28%,and low TFeO abundances, indicating it belongs to shoshonite to high K calc-alkaline series. While A/CNK>1.1 suggests peraluminous feature of S-type granite. Trace element geochemistry of the monzogranite also shows LILE enrichment and HFSE depletion. Most of the samples are concentrated on syn-collision and late orogenic tectonic settings in R1-R2 diagram, fall into syn-collision and post-collision settings in Rb- Hf -Ta diagram, plot into areas of volcanic arc and syn-collision in Nb-Y diagram, and cluster in syn-collision setting in Rb- (Y+Nb) diagram. Based on above-stated petrological and geochemical data it is inferred that the monzogranite of Yichun might be derived from a syn-collision setting, the Jiamusi and Songnen massifs amalgamated together in Middle Cambrian, and the amalagamation may be responsible for the crustal derived syn-collisional granites.
[1] 吴福元, 李献华, 杨进辉,等. 花岗岩成因研究的若干问题[J]. 岩石学报, 2007, 23(6): 1217-1238. [2] 周珣若. 花岗岩混合作用[J]. 地学前缘, 1994, 1(1/2): 87-97. [3] 肖庆辉, 邱瑞照, 邓晋福,等. 中国花岗岩与大陆地壳生长方式初步研究[J]. 中国地质, 2005, 32(3): 343-352. [4] White A J R, Chappell B W. I-and S-type granites in the Lachlan Fold Belt[J].Geological Society of America Special Papers,1992,272: 1-26. [5] 吴福元. 佳木斯地块片麻状花岗岩的锆石离子探针 U-Pb 年龄[J]. 岩石学报, 2001, 17(3): 443-452. [6] 万天丰, 朱鸿. 中国大陆及邻区中生代—新生代大地构造与环境变迁[J]. 现代地质, 2002, 16(2): 107-120. [7] 汪新文, 刘友元. 东北地区前中生代构造演化及其与晚中生代盆地发育的关系[J]. 现代地质, 1997, 11(4): 434-443. [8] 吴福元, 孙德有. 东北地区显生宙花岗岩的成因与地壳增生[J]. 岩石学报, 1999, 15(2): 181-189. [9] Wu F,Jahn B, Wilde S, et al. Phanerozoic crustal growth: U-Pb and Sr-Nd isotopic evidence from the granites in northeastern China[J]. Tectonophysics, 2000, 328(1): 89-113. [10] Liu S, Hu R,Gao S, et al. Zircon U-Pb age and Sr-Nd-Hf isotope geochemistry of Permian granodiorite and associated gabbro in the Songliao Block, NE China and implications for growth of juvenile crust[J]. Lithos, 2010, 114(3): 423-436. [11] 刘建峰, 迟效国, 董春艳,等. 小兴安岭东部早古生代花岗岩的发现及其构造意义[J]. 地质通报, 2008, 27(4): 534-544. [12] 周建波, 曾维顺, 曹嘉麟,等. 中国东北地区的构造格局与演化: 从 500 Ma 到 180 Ma[J]. 吉林大学学报 (地球科学版), 2012, 42(5): 1298-1316. [13] 曹熹, 党增欣, 张兴洲. 佳木斯复合地体[M]. 长春:吉林科学技术出版杜, 1992:1-224. [14] 林强, 葛文春, 孙德有,等. 中国东北地区中生代火山岩的大地构造意义[J]. 地质科学, 1998, (2):3-13. [15] 刘宝山, 任凤和, 李仰春,等. 伊春地区晚印支期 I 型花岗岩带特征及其构造背景[J]. 地质与勘探, 2007, 43(1): 74-78. [16] 赵寒冬, 马丽玲. 伊春地区晚三叠世花岗岩的成因初探[J]. 黑龙江地质, 1998, 9(4): 11-19. [17] Wilde S A, Wu F Y, Zhang X Z. The Mashan complex: SHRIMP U-Pb zircon evidence for a Late Pan-African metamorphic event in NE China and its implication for global continental reconstructions[J]. Geochimica, 2001, 30(1): 35-50. [18] 宋彪, 徐文喜. 黑龙江省东部麻山群黑云斜长片麻岩中锆石的年龄及其地质意义[J]. 地球学报: 中国地质科学院院报, 1997, 18(3): 306-312. [19] Wilde S A, Zhang X, Wu F Y. Extension of a newly identified 500 Ma metamorphic terrane in North East China: further U-Pb SHRIMP dating of the Mashan Complex, Heilongjiang Province, China[J]. Tectonophysics, 2000, 328(1): 115-130. [20] Wilde S A, 吴福元, 张兴洲. 中国东北麻山杂岩晚泛非期变质的锆石 SHRIMP 年龄证据及全球大陆再造意义[J]. 地球化学, 2001, 30(1): 35-50. [21] 颉颃强, 苗来成, 陈福坤,等. 黑龙江东南部穆棱地区 “麻山群” 的特征及花岗岩锆石 SHRIMP U-Pb 定年——对佳木斯地块最南缘地壳演化的制约[J]. 地质通报, 2009, 27(12): 2127-2137. [22] 陈行时, 张朋. 张广才岭英城子金矿区早古生代花岗岩的元素地球化学特征、岩石成因及构造意义[J].吉林大学学报(地球科学版), 2011, (2): 2127-2137. [23] 隋振民. 大兴安岭东北部花岗岩类锆石 U-Pb 年龄, 岩石成因及地壳演化[D]. 长春:吉林大学博士学位论文, 2007. [24] 党延松, 李德荣. 关于佳木斯地块前寒武纪同位素地质年代学问题的讨论[J]. 长春地质学院学报, 1993, 23(3): 312-318. [25] Wu F Y, Wilde S A, Sun D Y. SHRIMP U-Pb zircon age of the youngest exposed pluton in eastern China[J]. Chinese Science Bulletin, 2001, 46(20): 1727-1731. [26] Wu F Y, Zhao G C, Sun D Y, et al. The Hulan Group: its role in the evolution of the Central Asian Orogenic Belt of NE China[J]. Journal of Asian Earth Sciences, 2007, 30(3): 542-556. [27] Boynton W V.Cosmochemistry of the rare earth elements: meteoric studies[J]. Rare Earth Element Geochemistry, 1984: 63-114. [28] Sun S S, McDonough W F. Chemical and isotopic systematics of oceanic basalts: implications for mantle composition and processes[J]. Geological Society, London, Special Publications, 1989, 42(1): 313-345. [29] Collins W J, Beams S D, White A J R, et al. Nature and origin of A-type granites with particular reference to southeastern Australia[J]. Contributions to Mineralogy and Petrology, 1982, 80(2): 189-200. [30] Batchelor R A, Bowden P. Petrogenetic interpretation of granitoid rock series using multicationic parameters[J]. Chemical geology, 1985, 48(1): 43-55. [31] Pearce J A, Harris N B W,Tindle A G. Trace element discrimination diagrams for the tectonic interpretation of granitic rocks[J]. Journal of Petrology, 1984, 25(4): 956-983. [32] 温泉波, 刘永江, 李伟民,等.佳木斯地块花岗质片麻岩的独居石年龄及其地质意义[J]. 吉林大学学报(地球科学版), 2008, 38(2): 187-193. [33] 朱群. 佳木斯中间地块花岗岩-绿岩组合中花岗质杂岩的成因与演化[J]. 中国地质科学院沈阳地质矿产研究所集刊, 1990 (21): 116-132. [34] 刘桂香, 赵广江, 李永胜. 佳木斯地块西缘太平沟地区蛇绿岩的发现及其构造意义[J]. 地质与资源, 2012, 21(1): 51-58. [35] 权京玉, 迟效国, 张蕊,等. 松嫩地块东部新元古代东风山群碎屑锆石 LA-ICP-MS U-Pb 年龄及其地质意义[J]. 地质通报, 2013, 32(2): 353-364. [36] 阎鸿铨, 徐学纯.长春地质学院地质研究所文集[M].北京:地震出版社,1992:1-132. [37] 宋彪,李锦轶,牛宝贵,等. 黑龙江省东部麻山群黑云斜长片麻岩中锆石的年龄及其地质意义[J]. 地球学报,1997(3):83-89.
2015, Vol. 2 
