世界地质 2017, 36(2) 371-380 DOI:   10.3969/j.issn.1004-5589.2017.02.005  ISSN: 1004-5589 CN: 22-1111/P

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宝音图群
锆石U-Pb年龄
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内蒙古霍林郭勒地区“宝音图群”锆石U-Pb年龄及其构造意义
徐民, 刘永江, 温泉波, 高飞
吉林大学地球科学学院, 长春 130061
摘要

对内蒙古霍林郭勒地区出露的“宝音图群”砂岩进行了锆石LA-ICP-MS U-Pb同位素测年,样品112个分析点结果显示,具有主要峰值年龄257 Ma、283 Ma、313 Ma和少数老年龄(>1 700 Ma),且257 Ma的年龄表明该地层主体的沉积下限的时代为早三叠世,原定为下元古界的“宝音图群”实为早三叠世地层。该地层物源主要来自于大石寨组火山岩、苏尼特左旗—锡林浩特—西乌旗南岩浆弧和相邻地块的变质基底,并有少量华北板块北缘物源混入,说明在早三叠世初华北板块北缘与北侧地块已经开始碰撞。

关键词 宝音图群   锆石U-Pb年龄   早三叠世   物源区  
Zircon U-Pb ages and tectonic significance of Buyant Group in Holingola area,Inner Mongolia
XU Min, LIU Yong-jiang, WEN Quan-bo, GAO Fei
College of Earth Sciences, Jilin University, Changchun 130061, China
Abstract:

The zircon LA-ICP-MS U-Pb isotopic dating of sandstones in Buyant Group in Holingola area of Inner Mongolia has been presented. The results from 112 sampling points show that the main peaks of yield ages are 257 Ma, 283 Ma, 313 Ma and some older ages(>1 700 Ma). The zircons with a peak age of 257 Ma indicate that the depositional age of the sedimentary rocks was Early Triassic, which means that Buyant Group should be assigned into Lower Triassic, rather than Lower Proterozoic. The provenance of the sandstones are mainly the volcanic rocks of Dashizhai Formation, the Sunidzuoqi-Xilinhot-southern Xi Ujimqin volcanic arc and the metamorphic basement of the adjacent block, and partly from the northern margin of the North China Plate. It is indicated that the collision between the northern margin of North China Plate and the blocks to the north began in Early Triassic.

Keywords: Buyant Group   zircons U-Pb ages   Early Triassic   provenance  
收稿日期 2017-01-09 修回日期 2017-03-01 网络版发布日期  
DOI: 10.3969/j.issn.1004-5589.2017.02.005
基金项目:

国家重点基础研究发展计划“973”项目(2013CB429802)、国家自然科学青年基金项目(41102140)、中国地质调查局天津地质调查中心项目(DD20160128-04)联合资助.

通讯作者: 刘永江(1964),男,教授,主要从事构造地质学教学与研究.E-mail:yongjiang@jlu.edu.cn
作者简介:
作者Email: yongjiang@jlu.edu.cn

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