Crust-mantle mixing and crustal reworking of southern Tibet during Indian continental subduction: Evidence from Miocene high-silica potassic rocks in Central Lhasa block

doi:10.1016/j.lithos.2019.05.035

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 岩石圈演化国家重点实验室

	Crust-mantle mixing and crustal reworking of southern Tibet during Indian continental subduction: Evidence from Miocene high-silica potassic rocks in Central Lhasa block
	Hao, Lu-Lu 1,2; Wang, Qiang 1,3,4; Wyman, Derek A.5; Yang, Jin-Hui 6; Huang, Fang 2; Ma, Lin 1
刊名	LITHOS
	2019-10-01
卷号	342 页码:407-419
ISSN号	0024-4937
DOI	10.1016/j.lithos.2019.05.035
英文摘要	Collisional zones are commonly considered as important regions for crustal reworking, but the reworking mechanism remains debated. The well-known Himalayan-southern Tibetan orogen, built by India-Asia collision and convergence, has the thickest continental crust on Earth and is therefore an ideal region for studying crustal reworking during collisional orogenesis. Here we revisit the Miocene high-silica potassic rocks (trachytes) in the Konglong area of the central Lhasa block, southern Tibet. Integrated studies of geochronology, mineral compositions, bulk-rock major- and trace-element geochemistry, and Sr-Nd-Pb-Hf-O isotopes unequivocally indicate that the Konglong trachytes formed by mixing between enriched mantle-derived ultrapotassic and thickened ancient crust-derived magmas. Combined with post-collisional magma mixing recently identified in the southern Lhasa block, we suggest that magma underplating and subsequent mantle-crust interaction (i.e., the matter and energy transfer from the mantle to the crust) has been a common and important crustal reworking process in southern Tibet during Indian continental subduction. This process may be related to Indian plate flat subduction and subsequent foundering during the post-collisional stage. In combination with the nature of Cenozoic magmatism in the Himalaya block, we suggest that in addition to partial melting of the subducted continental crust, magma underplating and subsequent crust-mantle mixing beneath the obducted continent has also played an important role in crustal reworking of the collisional zone. (C) 2019 Elsevier B.V. All rights reserved.
资助项目	Strategic Priority Research Program (A) of Chinese Academy of Sciences (CAS)[XDA2007030402] ; National Natural Science Foundation of China[91855215] ; National Natural Science Foundation of China[41630208] ; National Natural Science Foundation of China[41802048] ; Second Tibetan Plateau Scientific Expedition and Research (STEP)[2019QZKK0702] ; Key Program of the Chinese Academy of Sciences[QYZDJ-SSW-DQCO26] ; National Key R & D Program of China[2016YFC0600407] ; Key Program of Guangzhou City[201604910124] ; Guangzhou Institute of Geochemistry, Chinese Academy of Science[135TP201601] ; Guangzhou Institute of Geochemistry, Chinese Academy of Science[GIGCAS 135]
WOS关键词	ZIRCON U-PB ; CALC-ALKALINE MAGMATISM ; ULTRAPOTASSIC MAGMATISM ; ISOTOPIC COMPOSITIONS ; ADAKITIC AFFINITIES ; TECTONIC EVOLUTION ; GANGDESE BATHOLITH ; INTRUSIVE ROCKS ; ASIA COLLISION ; DABIE OROGEN
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000477091500026
资助机构	Strategic Priority Research Program (A) of Chinese Academy of Sciences (CAS) ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Key Program of the Chinese Academy of Sciences ; National Key R & D Program of China ; Key Program of Guangzhou City ; Guangzhou Institute of Geochemistry, Chinese Academy of Science ; Strategic Priority Research Program (A) of Chinese Academy of Sciences (CAS) ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Key Program of the Chinese Academy of Sciences ; National Key R & D Program of China ; Key Program of Guangzhou City ; Guangzhou Institute of Geochemistry, Chinese Academy of Science ; Strategic Priority Research Program (A) of Chinese Academy of Sciences (CAS) ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Key Program of the Chinese Academy of Sciences ; National Key R & D Program of China ; Key Program of Guangzhou City ; Guangzhou Institute of Geochemistry, Chinese Academy of Science ; Strategic Priority Research Program (A) of Chinese Academy of Sciences (CAS) ; National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research (STEP) ; Key Program of the Chinese Academy of Sciences ; National Key R & D Program of China ; Key Program of Guangzhou City ; Guangzhou Institute of Geochemistry, Chinese Academy of Science
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/92964]
专题	地质与地球物理研究所_岩石圈演化国家重点实验室
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.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Anhui, Peoples R China 3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 4.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 10049, Peoples R China 5.Univ Sydney, Sch Geosci, Sydney, NSW 2006, Australia 6.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Hao, Lu-Lu,Wang, Qiang,Wyman, Derek A.,et al. Crust-mantle mixing and crustal reworking of southern Tibet during Indian continental subduction: Evidence from Miocene high-silica potassic rocks in Central Lhasa block[J]. LITHOS,2019,342:407-419.
APA	Hao, Lu-Lu,Wang, Qiang,Wyman, Derek A.,Yang, Jin-Hui,Huang, Fang,&Ma, Lin.(2019).Crust-mantle mixing and crustal reworking of southern Tibet during Indian continental subduction: Evidence from Miocene high-silica potassic rocks in Central Lhasa block.LITHOS,342,407-419.
MLA	Hao, Lu-Lu,et al."Crust-mantle mixing and crustal reworking of southern Tibet during Indian continental subduction: Evidence from Miocene high-silica potassic rocks in Central Lhasa block".LITHOS 342(2019):407-419.