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
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