中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Early triassic A-type felsic volcanism in the Xilinhaote-Xiwuji, central Inner Mongolia: Age, geochemistry and tectonic implications

文献类型:期刊论文

作者Zhang XiaoHui; Zhang HongFu; Tang YanJie; Liu JianMing
刊名ACTA PETROLOGICA SINICA
出版日期2006-11-01
卷号22期号:11页码:2769-2780
关键词dacite-rhyolite A-type geochemical characteristics petrogenesis early Triassic Inner Mongolia
ISSN号1000-0569
文献子类Article
英文摘要In this paper, we present the combined K-Ar geochronological, elemental and isotopic geochemical data for the felsic volcanics from Xilinhaote-Xiwuqi, Inner Mongolia. The whole-rock K-Ar dating gives an early Triassic age at around 245Ma and we interpret it as representing the intrusive age for these felsic volcanics. Geochemically, these rocks are high in silica and alkalis and low in calcium and magnesium and exhibit fractionated BEE patterns with remarkably negative Eu anomalies. They are also high in Ga,Zr, Nb,Ce,Y and Rb/Sr and low in Ba and Sr and display relatively enriched ( Sr-87/Sr-86) 0.7068 similar to 0.7099)and moderately positive ( + 1.66 similar to + 3.34) values. This indicates that these felsic volcanics share geochemical characteristics with aluminous A(2)-type granites, and probably generated by the direct partial melting of the newly-underplated lower crustal source heated by contemporaneous intrusion of mantle-derived basaltic magmas and the subsequent differentiations. They, together with the coeval tholeiite, constitute typical bimodal volcanic rock association developed within a post-orogenic or anorogenic extension setting. This not only provides further petrological evidences for establishing that the Inner Mongolia has seen the final amalgamation of terranes in the Central Asian Orogenic Belts ( CAOB) during late Permian, but also has important implications for the predominant role played by contributions of mantle-derived magmas in vertical continental growth of the CAOB during post-orogenic period.
WOS关键词TRACE-ELEMENT EVIDENCE ; CRYSTAL FRACTIONATION ; OROGENIC BELT ; MAJOR-ELEMENT ; PETROGENESIS ; CHINA ; GRANITES ; CONSTRAINTS ; ISOTOPE ; ORIGIN
WOS研究方向Geology
语种英语
WOS记录号WOS:000242929100015
出版者SCIENCE CHINA PRESS
源URL[http://ir.iggcas.ac.cn/handle/132A11/66282]  
专题中国科学院地质与地球物理研究所
通讯作者Zhang XiaoHui
作者单位Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithosphere Evolut, Beijing 100029, Peoples R China
推荐引用方式
GB/T 7714
Zhang XiaoHui,Zhang HongFu,Tang YanJie,et al. Early triassic A-type felsic volcanism in the Xilinhaote-Xiwuji, central Inner Mongolia: Age, geochemistry and tectonic implications[J]. ACTA PETROLOGICA SINICA,2006,22(11):2769-2780.
APA Zhang XiaoHui,Zhang HongFu,Tang YanJie,&Liu JianMing.(2006).Early triassic A-type felsic volcanism in the Xilinhaote-Xiwuji, central Inner Mongolia: Age, geochemistry and tectonic implications.ACTA PETROLOGICA SINICA,22(11),2769-2780.
MLA Zhang XiaoHui,et al."Early triassic A-type felsic volcanism in the Xilinhaote-Xiwuji, central Inner Mongolia: Age, geochemistry and tectonic implications".ACTA PETROLOGICA SINICA 22.11(2006):2769-2780.

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。