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Crustal thickening of the western Tibetan Plateau during the Early Cretaceous: Evidence from adakitic granodiorites, leucogranites, and monzogranites in the Songxi area, western Qiangtang Terrane

文献类型：期刊论文

作者Ke, Qiang1,4,5,6; Hong, Tao1,7,8; Xu, Xing-Wang1,4,5; Li, Hao1,4,5; Tong, Xiao-Xue1,4,5; Dong, Lian-Hui1,2; Fan, Ting-Bin2; Li, Hang1,4,5; Li, Yu-Hao3
刊名LITHOS
出版日期2021-06-01
卷号390页码:16
ISSN号0024-4937
关键词Adakitic rocks Leucogranites Crustal thickening Western Qiangtang Terrane Songxi area
DOI10.1016/j.lithos.2021.106117
英文摘要Felsic igneous rocks in the Songxi area are a key part of the Qiangtang Terrane and India-Asia collision zone, and can constrain the evolution of the Tibetan Plateau. This paper presents new geochronological, geochemical, and isotopic data for Early Cretaceous granodiorites (119 Ma), leucogranites (111 Ma), and monzogranites (107-102 Ma) from the Songxi area in the western Qiangtang Terrane. The granodiorites are characterized by enriched Sr-Nd-Pb-Hf isotopic compositions (Sr-87/(86)Sri = 0.70721-0.70925, epsilon(Nd)(t) = -7.6 to -5.6, (20)6Pb/(204)Pbi = 18.907-18.964, Pb-207/(204)Pbi = 15.782-15.825, and epsilon(Hf)(t) = -24.0 to -2.0) and are adakitic with low Mg-# values (39-44) and high K2O contents (2.6-3.9 wt%). The leucogranites have low Sr concentrations (80-100 ppm), high Rb/Sr (2.83-3.53) and low CaO/Na2O (0.19-0.22) ratios, high initial Sr-87/Sr-86 ratios (0.71653-0.71721), and low epsilon(Nd)(t) (-12.4 to -11.8) and epsilon(Hf)(t) (-18.8 to -6.8) values. The monzogranites are I-type granitoids and have enriched Sr-Nd-Pb-Hf isotopic compositions (Sr-87/(86)Sri = 0.70956-0.70966, epsilon(Nd)(t) = -8.5 to -8.3, Pb-206/(204)Pbi = 18.740-18.749, (20)7Pb/(204)Pbi = 15.759-15.778, and epsilon(Hf)(t) = -16.9 to -1.4). Our data suggest that these three types of granitoids were likely generated by partial melting of a thick-ened lower crust, metapelite-dominated source by fluid-absent muscovite melting, and normal lower crust, re-spectively. Integration of our new and existing data allows us to conclude that the Songxi granitoids formed in a continental margin arc setting. This further suggests that some sediment-derived leucogranites form in a con-tinental arc setting, and are unrelated to continental collision. Tectonic compression and crustal thickening of the western Tibetan Plateau during the Early Cretaceous occurred when the Bangong-Nujiang oceanic lithosphere was subducted northward at a low angle beneath the western Qiangtang Terrane before ca. 119 Ma. (C) 2021 Elsevier B.V. All rights reserved.
资助项目National Natural Science Foundation of China[41672088]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
出版者ELSEVIER
WOS记录号WOS:000640914100006
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
源URL[http://ir.iggcas.ac.cn/handle/132A11/101150]  
专题地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者Hong, Tao; Xu, Xing-Wang
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
2.Xinjiang Bur Geol & Mineral Resources, Urumqi 830000, Xinjiang, Peoples R China
3.Univ Alberta, Dept Earth & Atmospher Sci, Edmonton, AB T6G 2E3, Canada
4.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing 100029, Peoples R China
5.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
6.Wuhan Sample Solut Analyt Technol Co Ltd, Wuhan 430075, Peoples R China
7.Sun Yat Sen Univ, Sch Earth Sci & Engn, Guangdong Prov Key Lab Geodynam & Geohazards, Guangzhou 510275, Peoples R China
8.Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519082, Peoples R China
推荐引用方式
GB/T 7714		 Ke, Qiang,Hong, Tao,Xu, Xing-Wang,et al. Crustal thickening of the western Tibetan Plateau during the Early Cretaceous: Evidence from adakitic granodiorites, leucogranites, and monzogranites in the Songxi area, western Qiangtang Terrane[J]. LITHOS,2021,390:16.
APA Ke, Qiang.,Hong, Tao.,Xu, Xing-Wang.,Li, Hao.,Tong, Xiao-Xue.,...&Li, Yu-Hao.(2021).Crustal thickening of the western Tibetan Plateau during the Early Cretaceous: Evidence from adakitic granodiorites, leucogranites, and monzogranites in the Songxi area, western Qiangtang Terrane.LITHOS,390,16.
MLA Ke, Qiang,et al."Crustal thickening of the western Tibetan Plateau during the Early Cretaceous: Evidence from adakitic granodiorites, leucogranites, and monzogranites in the Songxi area, western Qiangtang Terrane".LITHOS 390(2021):16.

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来源：地质与地球物理研究所

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