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The role of subduction channel melanges and convergent subduction systems in the petrogenesis of post-collisional K-rich mafic magmatism in NW Tibet

文献类型：期刊论文

作者Guo, Zhengfu1; Wilson, Marjorie2; Zhang, Lihong1; Zhang, Maoliang1; Cheng, Zhihui1; Liu, Jiaqi1
刊名LITHOS
出版日期2014-06-01
卷号198页码:184-201
关键词Potassium-rich magmatic rocks Subduction channel Enriched asthenospheric mantle source Plateau uplift Northwest Tibet
ISSN号0024-4937
DOI10.1016/j.lithos.2014.03.020
文献子类Article
英文摘要Post-collisional potassium-rich mafic magmatism occurred in the northwestern part of the Tibetan Plateau, close to the western syntaxis of the Himalayan orogen, from 8.3 Ma to the present. This magmatism is associated with a tectonic setting influenced by opposing N and S dipping subduction systems formed during the collision of India and Asia. It postdates continent-continent collision and has been linked to the onset of near vertical subduction of Indian continental lithosphere at similar to 8 Ma. The magmatic rocks have relatively high MgO (4.02-9.04 wt.%), SiO2 (46.15-57.49 wt.%), K2O (3.26-7.23 wt.%), Ba (1071-3210 ppm), Th (8.2-85.2 ppm), and Pb (18.6-54.8 ppm) contents, and relatively low Al2O3 (12.74-15.78 wt.%). Sr-Nd-Pb isotopic compositions range from: (Sr-87/Sr-86)(i) (0.7072-0.7131), (Nd-143/Nd-144)(i) (0.511953-0.512528) and (Pb-206/Pb-204)(i) (18.67-19.08). Chondrite-normalized rare earth element (REE) patterns are characterized by light REE (LREE) enrichment, flat heavy REE (HREE) patterns and slightly negative Eu anomalies in some of the magmatic rocks. Primitive mantle-normalized incompatible element patterns display strong enrichments in large ion lithophile elements (LILE) relative to high field strength elements (HFSE) and distinct negative Ta-Nb-Ti anomalies. The major and trace element and Sr-Nd-Pb isotope characteristics of the most primitive mafic igneous rocks are interpreted in terms of a mantle source region dominated by subduction channel-derived melange material derived from both the Indian and Asian subduction systems. This melange material was underplated below the lithosphere of the Songpan-Ganzi terrane of NW Tibet, probably within the past 25 Ma Partial melting of the underplated melange was induced by adiabatic decompression linked to the onset of near vertical subduction of the Indian slab at similar to 8 Ma. (C) 2014 Elsevier B.V. All rights reserved.
WOS关键词EAST-WEST EXTENSION ; VOLCANIC-ROCKS ; GEOCHEMICAL CONSTRAINTS ; CONTINENTAL SUBDUCTION ; NORTHERN TIBET ; TRACE-ELEMENTS ; ARC MAGMAS ; ULTRAPOTASSIC MAGMATISM ; SHOSHONITIC VOLCANISM ; PLATEAU IMPLICATIONS
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000337851100014
出版者ELSEVIER SCIENCE BV
资助机构Chinese Academy of Sciences(XDB03010600) ; Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China (NSFC)(41020124002 ; National Natural Science Foundation of China (NSFC)(41020124002 ; Royal Society of London - NSFC ; Royal Society of London - NSFC ; 41130314) ; 41130314) ; Chinese Academy of Sciences(XDB03010600) ; Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China (NSFC)(41020124002 ; National Natural Science Foundation of China (NSFC)(41020124002 ; Royal Society of London - NSFC ; Royal Society of London - NSFC ; 41130314) ; 41130314) ; Chinese Academy of Sciences(XDB03010600) ; Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China (NSFC)(41020124002 ; National Natural Science Foundation of China (NSFC)(41020124002 ; Royal Society of London - NSFC ; Royal Society of London - NSFC ; 41130314) ; 41130314) ; Chinese Academy of Sciences(XDB03010600) ; Chinese Academy of Sciences(XDB03010600) ; National Natural Science Foundation of China (NSFC)(41020124002 ; National Natural Science Foundation of China (NSFC)(41020124002 ; Royal Society of London - NSFC ; Royal Society of London - NSFC ; 41130314) ; 41130314)
源URL[http://ir.iggcas.ac.cn/handle/132A11/86514]  
专题中国科学院地质与地球物理研究所
通讯作者Guo, Zhengfu
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
2.Univ Leeds, Sch Earth & Environm, Leeds LS2 9JT, W Yorkshire, England
推荐引用方式
GB/T 7714		 Guo, Zhengfu,Wilson, Marjorie,Zhang, Lihong,et al. The role of subduction channel melanges and convergent subduction systems in the petrogenesis of post-collisional K-rich mafic magmatism in NW Tibet[J]. LITHOS,2014,198:184-201.
APA Guo, Zhengfu,Wilson, Marjorie,Zhang, Lihong,Zhang, Maoliang,Cheng, Zhihui,&Liu, Jiaqi.(2014).The role of subduction channel melanges and convergent subduction systems in the petrogenesis of post-collisional K-rich mafic magmatism in NW Tibet.LITHOS,198,184-201.
MLA Guo, Zhengfu,et al."The role of subduction channel melanges and convergent subduction systems in the petrogenesis of post-collisional K-rich mafic magmatism in NW Tibet".LITHOS 198(2014):184-201.

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来源：地质与地球物理研究所

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