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Crustal Melting and Flow beneath Northern Tibet: Evidence from Mid-Miocene to Quaternary Strongly Peraluminous Rhyolites in the Southern Kunlun Range

文献类型：期刊论文

作者Wang, Qiang1,2,3; Chung, Sun-Lin4; Li, Xian-Hua5; Wyman, Derek6; Li, Zheng-Xiang2,3; Sun, Wei-Dong1; Qiu, Hua-Ning1; Liu, Yong-Sheng7; Zhu, Ying-Tang8
刊名JOURNAL OF PETROLOGY
出版日期2012-12-01
卷号53期号:12页码:2523-2566
关键词Tibet crustal melting crustal flow low-velocity zone crustal thickening plateau growth
ISSN号0022-3530
DOI10.1093/petrology/egs058
文献子类Article
英文摘要One of the major geophysical discoveries concerning the Tibetan Plateau is the existence of unusually weak layers in the mid- to lower crust, a characteristic widely interpreted as the result of crustal melting. This interpretation, however, remains highly contentious, particularly when applied to northern Tibet where crustally derived magmatic rocks are scarce. Here we report the finding of tourmaline-bearing mica and biotite rhyolites in the Bukadaban-Malanshan area, southern Kunlun Range, near the northern margin of the Tibetan Plateau. Zircon U-Pb and whole-rock or mineral Ar-40-Ar-39 analyses suggest that these rocks erupted between 9 center dot 0 and 1 center dot 5 Ma. These rocks are geochemically similar to Himalayan leucogranites (interpreted as crustal melts), with strongly peraluminous compositions, high SiO2 contents (69 center dot 0-76 center dot 0 wt %), and clear negative Eu, Ba and Sr anomalies. They have low epsilon Nd (-5 center dot 8 to -8 center dot 6) and high Sr-87/Sr-86 (0 center dot 7125-0 center dot 7178), Pb-206/Pb-204 (18 center dot 59-18 center dot 70), Pb-207/Pb-204 (15 center dot 49-15 center dot 63) and Pb-208/Pb-204 (38 center dot 31-38 center dot 74) isotopic compositions as well as magmatic zircon epsilon Hf (-0 center dot 7 to -5 center dot 0) compositions similar to those of global marine sediments and Proterozoic-Triassic sedimentary rocks in northern Tibet. We suggest that the Bukadaban-Malanshan rhyolites were generated by dehydration melting of metasedimentary rocks at 0 center dot 5-1 center dot 2 GPa and 740-863 degrees C. Our data not only confirm the occurrence of a partially molten zone in the mid- to lower crust beneath northern Tibet but also constrain the crustal melting to have existed from middle Miocene to Quaternary times. Adopting the crustal flow model, we further argue the importance of outward flowing of the melt-weakened crust in the formation of crustal inflation, surface uplift, and earthquakes along the northern margin of the Tibetan Plateau.
WOS关键词CENOZOIC TECTONIC EVOLUTION ; PB ZIRCON GEOCHRONOLOGY ; PLASMA-MASS SPECTROMETRY ; UPPER-MANTLE STRUCTURE ; ULUGH-MUZTAGH AREA ; ALTYN TAGH FAULT ; TRACE-ELEMENT ; CONTINENTAL-CRUST ; VOLCANIC-ROCKS ; CHANNEL FLOW
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000311670500005
出版者OXFORD UNIV PRESS
资助机构Chinese Academy of Sciences(KZCX2-YW-Q09-05-01) ; Chinese Academy of Sciences(KZCX2-YW-Q09-05-01) ; National Natural Science Foundation of China (NSFC)(41025006 ; National Natural Science Foundation of China (NSFC)(41025006 ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS)(Y234021001) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS)(Y234021001) ; 41073029 ; 41073029 ; 41121002) ; 41121002) ; Chinese Academy of Sciences(KZCX2-YW-Q09-05-01) ; Chinese Academy of Sciences(KZCX2-YW-Q09-05-01) ; National Natural Science Foundation of China (NSFC)(41025006 ; National Natural Science Foundation of China (NSFC)(41025006 ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS)(Y234021001) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS)(Y234021001) ; 41073029 ; 41073029 ; 41121002) ; 41121002) ; Chinese Academy of Sciences(KZCX2-YW-Q09-05-01) ; Chinese Academy of Sciences(KZCX2-YW-Q09-05-01) ; National Natural Science Foundation of China (NSFC)(41025006 ; National Natural Science Foundation of China (NSFC)(41025006 ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS)(Y234021001) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS)(Y234021001) ; 41073029 ; 41073029 ; 41121002) ; 41121002) ; Chinese Academy of Sciences(KZCX2-YW-Q09-05-01) ; Chinese Academy of Sciences(KZCX2-YW-Q09-05-01) ; National Natural Science Foundation of China (NSFC)(41025006 ; National Natural Science Foundation of China (NSFC)(41025006 ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS)(Y234021001) ; Guangzhou Institute of Geochemistry, Chinese Academy of Sciences (GIGCAS)(Y234021001) ; 41073029 ; 41073029 ; 41121002) ; 41121002)
源URL[http://ir.iggcas.ac.cn/handle/132A11/84314]  
专题中国科学院地质与地球物理研究所
通讯作者Wang, Qiang
作者单位1.Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China
2.Curtin Univ Technol, ARC Ctr Excellence Core Crust Fluid Syst CCFS, Perth, WA 6845, Australia
3.Curtin Univ Technol, Inst Geosci Res TIGER, Dept Appl Geol, Perth, WA 6845, Australia
4.Natl Taiwan Univ, Dept Geosci, Taipei 10617, Taiwan
5.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
6.Univ Sydney, Sch Geosci, Sydney, NSW 2006, Australia
7.China Univ Geosci, Fac Earth Sci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Peoples R China
8.Chengdu Univ Technol, Sedimentary Geol Inst, Chengdu 610059, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Qiang,Chung, Sun-Lin,Li, Xian-Hua,et al. Crustal Melting and Flow beneath Northern Tibet: Evidence from Mid-Miocene to Quaternary Strongly Peraluminous Rhyolites in the Southern Kunlun Range[J]. JOURNAL OF PETROLOGY,2012,53(12):2523-2566.
APA Wang, Qiang.,Chung, Sun-Lin.,Li, Xian-Hua.,Wyman, Derek.,Li, Zheng-Xiang.,...&Zhu, Ying-Tang.(2012).Crustal Melting and Flow beneath Northern Tibet: Evidence from Mid-Miocene to Quaternary Strongly Peraluminous Rhyolites in the Southern Kunlun Range.JOURNAL OF PETROLOGY,53(12),2523-2566.
MLA Wang, Qiang,et al."Crustal Melting and Flow beneath Northern Tibet: Evidence from Mid-Miocene to Quaternary Strongly Peraluminous Rhyolites in the Southern Kunlun Range".JOURNAL OF PETROLOGY 53.12(2012):2523-2566.

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