中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 地质与地球物理研究所
  3. 中国科学院地质与地球物理研究所
  4. 中国科学院新生代地质与环境重点实验室
New insights into the emplacement mechanism of the Late Triassic granite plutons in the Qinling orogen: A structural study of the Mishuling pluton

文献类型：期刊论文

作者Liang, Wentian1,2; Zhang, Guowei1; Bai, Yong1; Jin, Chunsheng3; Nantasin, Prayath2,4
刊名GEOLOGICAL SOCIETY OF AMERICA BULLETIN
出版日期2015-11-01
卷号127期号:11-12页码:1583-1603
DOI10.1130/B31187.1
文献子类Article
英文摘要Numerous geochronological and geochemical studies of the Late Triassic granite plutons in the Qinling orogen have been conducted over the past few decades. These studies have extensively discussed the genesis and correlations of granite plutons with the collisional processes between the North and South China blocks. However, several contradictory conclusions on the tectonic settings of these plutons (subduction, syncollision, postcollision, or intraplate) have been reached. Moreover, in all these studies, compressional or extensional structures have been always considered to control the magma emplacement, but no direct evidence has been presented so far. In order to clarify the emplacement mechanism of these Late Triassic plutons and avoid the ambiguities from purely geochemical studies, we conducted a multidisciplinary structural study on the Mishuling pluton in West Qinling, one of the biggest Late Triassic plutons in the orogen. New single-grain zircon dating confirmed that the Mishuling pluton was emplaced at 212 +/- 2 Ma. Gravity investigations show an overall wedge shape to the pluton: A deep root is located in its western part, the thickness gradually decreases to the east, and it finally pinches out at its eastern extremity. We studied internal structures of the Mishuling pluton through field, microscopic, and AMS (anisotropy of magnetic susceptibility) observations, which show that the pluton did not undergo penetrative secondary deformation, and preserved cryptic internal fabrics were mainly acquired during the final stage of emplacement. In the western part of the pluton, internal fabrics display a concentric pattern. In the eastern part, the lineations mainly plunge west, while the foliations form an analogous W-plunging synform, mainly dipping SW in the northern part and dipping NW in the southern part. The three-dimensional shape and internal structures of the Mishuling-pluton are concordant with the wrench tectonics of country rocks that developed during the late stage of the Late Triassic collision between the North and South China blocks. We propose an integrated emplacement model involving both the three-dimensional shape and internal fabrics of the Mishuling pluton, and regional structures of the country rocks. In this model, the magma rose in the western part and then spread eastward parallel to the regional strike-slip movements.
WOS关键词CENTRAL CHINA ; SHEAR ZONES ; DYNAMIC SIGNIFICANCE ; MAGNETIC-ANISOTROPY ; TECTONIC EVOLUTION ; NORTHEAST BRAZIL ; MAGMA ; DEFORMATION ; BELT ; ROCKS
WOS研究方向Geology
语种英语
WOS记录号WOS:000364200700008
资助机构"Strategic Priority Research Program" of the Chinese Academy of Sciences(XDB03020102) ; "Strategic Priority Research Program" of the Chinese Academy of Sciences(XDB03020102) ; National Basic Research Program of China(2013CB956403) ; National Basic Research Program of China(2013CB956403) ; National Natural Science Foundation of China(41421002 ; National Natural Science Foundation of China(41421002 ; MOST Special Fund from State Key Laboratory of Continental Dynamics, Northwest University(BJ081331 ; MOST Special Fund from State Key Laboratory of Continental Dynamics, Northwest University(BJ081331 ; 41002070 ; 41002070 ; BJ14257) ; BJ14257) ; 41004023) ; 41004023) ; "Strategic Priority Research Program" of the Chinese Academy of Sciences(XDB03020102) ; "Strategic Priority Research Program" of the Chinese Academy of Sciences(XDB03020102) ; National Basic Research Program of China(2013CB956403) ; National Basic Research Program of China(2013CB956403) ; National Natural Science Foundation of China(41421002 ; National Natural Science Foundation of China(41421002 ; MOST Special Fund from State Key Laboratory of Continental Dynamics, Northwest University(BJ081331 ; MOST Special Fund from State Key Laboratory of Continental Dynamics, Northwest University(BJ081331 ; 41002070 ; 41002070 ; BJ14257) ; BJ14257) ; 41004023) ; 41004023)
源URL[http://ir.iggcas.ac.cn/handle/132A11/62176]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
作者单位1.NW Univ Xian, State Key Lab Continental Dynam, Xian 710069, Peoples R China
2.Karl Franzens Univ Graz, Dept Earth Sci, A-8010 Graz, Austria
3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
4.Kasetsart Univ, Dept Earth Sci, Bangkok 10900, Thailand
推荐引用方式
GB/T 7714		 Liang, Wentian,Zhang, Guowei,Bai, Yong,et al. New insights into the emplacement mechanism of the Late Triassic granite plutons in the Qinling orogen: A structural study of the Mishuling pluton[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2015,127(11-12):1583-1603.
APA Liang, Wentian,Zhang, Guowei,Bai, Yong,Jin, Chunsheng,&Nantasin, Prayath.(2015).New insights into the emplacement mechanism of the Late Triassic granite plutons in the Qinling orogen: A structural study of the Mishuling pluton.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,127(11-12),1583-1603.
MLA Liang, Wentian,et al."New insights into the emplacement mechanism of the Late Triassic granite plutons in the Qinling orogen: A structural study of the Mishuling pluton".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 127.11-12(2015):1583-1603.

入库方式： OAI收割

来源：地质与地球物理研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。