Late early Cretaceous peraluminous biotite granites along the Bangong-Nujiang suture zone, Central Tibet: Products derived by partial melting of metasedimentary rocks?

doi:10.1016/j.lithos.2019.06.005

GIG OpenIR

	Hu, Wan-Long 1,2; Wang, Qiang 1,2,3; Yang, Jin-Hui 4; Zhang, Chunfu 5; Tang, Gong-Jian 1,3; Ma, Lin 1; Qi, Yue 1,2; Yang, Zong-Yong 1,2; Sun, Peng 1,2
	Late early Cretaceous peraluminous biotite granites along the Bangong-Nujiang suture zone, Central Tibet: Products derived by partial melting of metasedimentary rocks?
刊名	LITHOS
ISSN号	0024-4937
	2019-11-01
卷号	344 页码:147-158
DOI	10.1016/j.lithos.2019.06.005
语种	英语
WOS研究方向	Geochemistry & Geophysics ; Mineralogy
摘要	The petrogenesis of biotite granites, which may be metaluminous or peraluminous in composition, is a subject of debate. In this study, we present new zircon U-Pb geochronology and O-Hf isotopic, and whole-rock major and trace element, and Sr-Nd isotopic data for biotite granites in the Langla-Laqinpu area of northern Lhasa Terrane, central Tibet. The rocks are distributed along the eastern segment of the Bangong-Nujiang Tethys Ocean suture, and were emplaced during the late Early Cretaceous (ca.119 Ma). The biotite granites are peraluminous, and have high SiO2 (67.5-72.4 wt%) and low MgO (0.57-1.20 wt%) and CaO (2.36-4.38 wt%) contents with variable K2O/Na2O ratios (0.77-132), and show geochemical affinity with the upper-continental crust, e.g enrichment of Rb, Th, U, K and Pb, depletion of Nb,Ta,Ti,P,Eu, and Sr. They are characterized by relatively high initial Sr-87/Sr-86 ratios ((Sr-87/Sr-86); = 0.7098-0.7137) and low epsilon(Nd)(t) values (-8.4 to -10.3), and high zircon delta O-18 values (8.29-13.47 parts per thousand) and variable epsilon(Hf)(t) values (-0.02 to -21.36), indicating they were derived through partial melting of a crustal source consisting of metagreywackes with or without minor metaigneous rocks. Taking into account all available regional geological data, we suggest that the Bangong-Nujiang Tethys Ocean may undergo diachronous closure-although the eastern segment may have been closed by the late Early Cretaceous, its western and western-middle segments may still have been at least partially open and active at that time. The Langla-Laqinpu biotite granites were probably generated in post-collisional setting, following slab break-off after closure of the Bangong-Nujiang Tethys Ocean. (C) 2019 Elsevier B.V. All rights reserved.
关键词	Early Cretaceous Biotite granite Bangong-Nujiang Tethys Ocean Post-collision Tibet
WOS记录号	WOS:000483419900009
收录类别	SCI
引用统计
文献类型	期刊论文
条目标识符	http://ir.gig.ac.cn/handle/344008/49109
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 Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing 100049, Peoples R China 3.CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 5.Ft Hays State Univ, Dept Geosci, Hays, KS 67601 USA
推荐引用方式 GB/T 7714	Hu, Wan-Long,Wang, Qiang,Yang, Jin-Hui,et al. Late early Cretaceous peraluminous biotite granites along the Bangong-Nujiang suture zone, Central Tibet: Products derived by partial melting of metasedimentary rocks?[J]. LITHOS,2019,344:147-158.
APA	Hu, Wan-Long.,Wang, Qiang.,Yang, Jin-Hui.,Zhang, Chunfu.,Tang, Gong-Jian.,...&Sun, Peng.(2019).Late early Cretaceous peraluminous biotite granites along the Bangong-Nujiang suture zone, Central Tibet: Products derived by partial melting of metasedimentary rocks?.LITHOS,344,147-158.
MLA	Hu, Wan-Long,et al."Late early Cretaceous peraluminous biotite granites along the Bangong-Nujiang suture zone, Central Tibet: Products derived by partial melting of metasedimentary rocks?".LITHOS 344(2019):147-158.