吉林大学学报(地球科学版) ›› 2019, Vol. 49 ›› Issue (4): 1053-1062.doi: 10.13278/j.cnki.jjuese.20180135

• 地质与资源 • 上一篇    下一篇

内蒙古乌拉特中旗色尔腾山岩群东五分子岩组锆石SHRIMP定年及其地质意义

王挽琼1, 刘正宏2, 徐仲元2, 白新会3   

  1. 1. 西南石油大学地球科学与技术学院, 成都 610500;
    2. 吉林大学地球科学学院, 长春 130061;
    3. 四川省冶金地质勘查局成都地质调查所, 成都 610203
  • 收稿日期:2018-05-28 出版日期:2019-07-26 发布日期:2019-07-26
  • 作者简介:王挽琼(1986-),女,讲师,博士,主要从事矿物学、岩石学、矿床学、区域地质调查方面的研究,E-mail:809249638@qq.com
  • 基金资助:
    西南石油大学青年教师"过学术关"项目（201499010045）；西南石油大学科研起航计划项目（2017QHZ007）；四川省教育厅科研项目（16ZB0092）；中国地质调查局项目（1212011120709，1212011220459）

Zircon SHRIMP Dating and Its Geological Significance of Dongwufenzi Formation of Sertengshan Group in Urad Zhongqi, Inner Mongolia

Wang Wanqiong1, Liu Zhenghong2, Xu Zhongyuan2, Bai Xinhui3   

  1. 1. School of Geoscience and Technology, Southwest Petroleum University, Chengdu 610500, China;
    2. College of Earth Sciences, Jilin University, Changchun 130061, China;
    3. Chengdu Geological Survey, Sichuan Metallurgical Geological Prospecting Bureau, Chengdu 610203, China
  • Received:2018-05-28 Online:2019-07-26 Published:2019-07-26
  • Supported by:
    Supported by Project of Academic Check for Yong Teachers of Southwest Petroleum University (201499010045),Research Plan Projects of Southwest Petroleum University (2017QHZ007), Scientific Research Project of the Department of Education, Sichuan Province (16ZB0092) and Project of Geological Survey (1212011120709,1212011220459)

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摘要： 色尔腾山岩群是华北克拉通中西部早前寒武纪变质结晶基底的主要组成部分，对研究华北克拉通基底演化具有十分重要的意义。色尔腾山岩群的形成时代是目前研究的热点之一，本文通过岩石学和锆石SHRIMP U-Pb定年研究，查明了内蒙古乌拉特中旗乌兰乡查干哈达地区色尔腾山岩群东五分子岩组的岩石组成和年代学特征。东五分子岩组遭受了后期岩浆和构造作用的强烈破坏，未见顶底，主要由中细粒斜长角闪岩、细粒黑云斜长片麻岩、眼球状细粒黑云斜长片麻岩、条带状细粒黑云斜长片麻岩和细粒黑云角闪片岩组成，矿物组合特征指示岩石经历了低绿片岩相-低角闪岩相变质。其中，眼球状细粒黑云斜长片麻岩出露相对较厚，与细粒黑云斜长片麻岩多呈互层状产出，局部偶夹细粒黑云斜长片麻岩。本次研究选取其中新鲜的细粒黑云斜长片麻岩进行了锆石SHRIMP U-Pb测年分析，其锆石多呈自形-半自形，发育震荡环带，主体为岩浆成因，锆石SHRIMP U-Pb定年结果为（1 930.7±9.6）Ma，代表原岩（中酸性火山岩）冷凝结晶年龄，表明东五分子岩组经历变质作用的时代应晚于1 930 Ma。

关键词: 黑云斜长片麻岩, 正片麻岩, 锆石U-Pb年龄, 色尔腾山岩群, 东五分子岩组, 乌拉特中旗

Abstract: The Sertengshan Group is an important component of the Early Precambrian metamorphic basement in the mid-west of the North China craton. It is of significance to study the tectonic evolution of the Early Precambrian North China craton. The formation age of the Sertengshan Group is one of the current research hotspots. In this paper, through the study of petrology and zircon SHRIMP U-Pb dating, the rock composition and chronological characteristics of Dongwufenzi Formation of the Sertengshan Group in the Chaganhada area of Urad Zhongqi were identified. The Dongwufenzi Formation suffered severe destruction of magmatism and tectonism in the later period, and has no an intact top and bottom. It is mainly composed of medium-fine amphibolites, fine-grained biotite plagioclase gneisses, augen fine-grained biotite plagioclase gneisses, banded fine-grained biotite plagioclase gneisses, and fine-grained biotite hornblende schists. The mineral assemblage characteristics indicate that it experienced low green schist facies-low amphibolite facies metamorphism. Most automorphic and semi-automorphic zircons with oscillatory zoning indicate its magmatic origin from the fine-bearing biotite plagioclase gneiss. The zircon SHRIMP U-Pb dating results (1 930.7±9.6 Ma) represent the formation age of basal rock, suggesting that the metamorphic age of the Dongwufenzi Formation should be later than 1 930 Ma.

Key words: biotite plagioclase gneiss, granitic gneiss, zircon U-Pb age, Sertengshan Group, Dongwufenzi Formation, Urad Zhongqi

中图分类号: 

  • P588.3
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