中国科学院紫金山天文台机构知识库
Advanced  
PMO OpenIR  > 天体化学和行星科学实验室  > 期刊论文
题名: New understanding on Ximeng Group in Three River area, western Yunnan: Evidence from structural characterization and zircon U-Pb dating
作者: Tang Yuan; Wang DongBing; Liao ShiYong; Yin FuGuang
刊名: ACTA PETROLOGICA SINICA
出版日期: 2017
卷号: 33, 期号:7, 页码:2054-2072
英文摘要: Located in the eastern margin of Baoshan-Shan Thai block, the Ximeng Group was long regarded as the only Precambrian metamorphic basement rocks exposed in China of this block. Without scientific and reliable data of geochronology and paleontology, the age of the metamorphic rocks is still controversial. Based on detailed macro- and micro-structural observations, the metamorphic rocks of Ximeng Group which shows domelike uplift can be divided into granitic mylonites and low grade metamorphic rocks. The former are distributed in core of the uplift and have experienced intensively ductile deformation. The latter are distributed in the rim and have the similar features of Pake Formation and Wangya-Yungou Formation. According to EBSD fabric analysis of quartz in the deformed rocks of Ximeng Group, it can reveal that the rocks closed to the core have experienced an early stage of deformation at intermediate temperatures (550 similar to 650 degrees C, corresponding to amphibolite facies) and a late deformation at low temperature (400 similar to 550 degrees C, greenschist facies), while the rocks near the rim of uplift have been deformed at low temperature (400 550 degrees C). In this paper, three samples of granitic mylonites were chosen for LA-ICP-MS zircon U-Pb dating, giving ages of 455 +/- 3Ma, 456 +/- 3Ma and 454 +/- 3Ma respectively. Combined with previous research results of geochronology and paleontology, it indicates that the protolith of the Ximeng metamorphic rocks may be composed of two parts. The first part is the Ordovician granite ( similar to 460Ma) and the other mainly comprises Cambrian carbonate, elastic rocks and minor basic volcanic rock. The former is highly deformed into mylonites during the ductile shearing, and the latter is transformed into phylite, schist and marble due to low grade metamorphism at low temperature (400 550 degrees C, greenschist facies). It also can be concluded that Ximeng Group should not be regarded as the Precambrian metamorphic basement rocks of Baoshan block.
语种: 英语
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17413
Appears in Collections:天体化学和行星科学实验室_期刊论文

Files in This Item: Download All
File Name/ File Size Content Type Version Access License
2017145.pdf(2413KB)期刊论文作者接受稿开放获取View Download
Service
Recommend this item
Sava as my favorate item
Show this item's statistics
Export Endnote File
Google Scholar
Similar articles in Google Scholar
[Tang Yuan]'s Articles
[Wang DongBing]'s Articles
[Liao ShiYong]'s Articles
CSDL cross search
Similar articles in CSDL Cross Search
[Tang Yuan]‘s Articles
[Wang DongBing]‘s Articles
[Liao ShiYong]‘s Articles
Related Copyright Policies
Null
Social Bookmarking
Add to CiteULike Add to Connotea Add to Del.icio.us Add to Digg Add to Reddit
文件名: 2017145.pdf
格式: Adobe PDF
所有评论 (0)
暂无评论
 
评注功能仅针对注册用户开放,请您登录
您对该条目有什么异议,请填写以下表单,管理员会尽快联系您。
内 容:
Email:  *
单位:
验证码:   刷新
您在IR的使用过程中有什么好的想法或者建议可以反馈给我们。
标 题:
 *
内 容:
Email:  *
验证码:   刷新

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.

 

 

Valid XHTML 1.0!
Copyright © 2007-2018  中国科学院紫金山天文台 - Feedback
Powered by CSpace