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Late Triassic ridge subduction of Paleotethys: Insights from high-Mg granitoids in the Songpan-Ganzi area of northern Tibet

文献类型：期刊论文

作者Liu, Yin1,2; Xiao, Wenjiao1,2,3; Windley, Brian F.4; Li, Rongshe5; Ji, Wenhua5; Zhou, Kefa1; Sang, Miao1; Chen, Yichao1,2; Jia, Xiaoliang1; Li, Liang1,2
刊名LITHOS
出版日期2019-06-01
卷号334页码:254-272
关键词High-Mg andesite/diorite Slab window Ridge subduction Songpan-Ganzi Jinsha Ocean Qiangtang Tibet
ISSN号0024-4937
DOI10.1016/j.lithos.2019.03.012
英文摘要The time of final closure of the Paleotethys Ocean is still hotly debated in particular regarding the Jinsha Ocean in northern Tibet. This study reports new geochronologic, geochemical and zircon Hf isotopic data of six granodiorites-diorites, which intrude the Mid-Late Triassic Songpan-Ganzi complex (SGC). LA-ICP-MS zircon U-Pb analyses of three quartz diorites (214.9 +/- 2.2, 211.0 +/- 1.3, 205.8 +/- 1.4 Ma) and three granodiorites (210.8 +/- 2.7, 206.7 +/- 3.3, 205.9 +/- 3.5 Ma) gave a Late Triassic age range (214.9-205.8 Ma). These granodiorite-diorite rocks have relatively high MgO (up to 9.1%) and Mg-# (up to 70.2), Al2O3, Cr, Ni, but low TiO2, and high magnesium andesite/diorite (HMA) chemical signatures with low Sr and Y content, and slight-moderate negative Eu anomaly. Also, the dioritic enclaves and Late Triassic detrital zircons (as young as 208 Ma) were captured by studied rocks. Hf isotope data show overall slight to moderate negative zircon epsilon Hf(t) values (-1.97 to -5.76, -4.12 to -6.72) and heterogeneous T-DM(C) ages (1.38-1.61Ga, 1.51-1.68Ga) for quartz diorites and granodiorites respectively, together with other published Hf isotopic data in SGC, are in highly concert with those around similar to 240 and similar to 440Ma magmas (as potential sources for SGC turbidites) in east Kunlun orogenic belt. Taken together, the HMA magmas were probably derived from a reaction between subducted marine sedimentary siliceous melts and peridotites from a mantle wedge. The linear distribution of Late Triassic HMAs and their eastward-younging trend (from northern Qiangtang to southern SGC), in combination with the contrasting distribution of volcanic rocks in the northern Qiangtang terrane, lead us to suggest that a slab window opened in the downgoing oceanic crust with two diverse slab angles during oblique subduction. Accordingly, the final closure of the Paleotethys Ocean was later than 205 Ma, and most likely in the end of the Late Triassic to Early Jurassic. (C) 2019 Elsevier B.V. All rights reserved.
WOS关键词GARZE FOLD BELT ; SETOUCHI VOLCANIC BELT ; A-TYPE GRANITES ; PB ZIRCON AGES ; ADAKITIC MAGMATISM ASSOCIATION ; HIGH-MAGNESIAN ANDESITES ; WESTERN KUNLUN RANGE ; ASIAN OROGENIC BELT ; SLAB-DERIVED MELTS ; U-PB
资助项目National Natural Science Foundation of China[41888101] ; National Key R&D Program of China[2017YFC0601206] ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences (CAS)[XDB18020203] ; Key Research Program of Frontier Sciences, CAS[QYZDJ-SSW-SYS012]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000468720900017
出版者ELSEVIER SCIENCE BV
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 Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences (CAS) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences (CAS) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences (CAS) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences (CAS) ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; 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 Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences (CAS) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences (CAS) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences (CAS) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences (CAS) ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; 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 Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences (CAS) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences (CAS) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences (CAS) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences (CAS) ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; 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 Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; National Key R&D Program of China ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences (CAS) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences (CAS) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences (CAS) ; Strategic Priority Research Program (B) of the Chinese Academy of Sciences (CAS) ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS ; Key Research Program of Frontier Sciences, CAS
源URL[http://ir.iggcas.ac.cn/handle/132A11/92100]  
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Xiao, Wenjiao
作者单位1.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, Xinjiang Res Ctr Mineral Resources, Urumqi 830011, Peoples R China
2.Univ Chinese Acad Sci, Sch Earth & Planetary Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
4.Univ Leicester, Dept Geol, Leicester LE1 7RH, Leics, England
5.Xian Inst Geol & Mineral Resources, Xian 710054, Shaanxi, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Yin,Xiao, Wenjiao,Windley, Brian F.,et al. Late Triassic ridge subduction of Paleotethys: Insights from high-Mg granitoids in the Songpan-Ganzi area of northern Tibet[J]. LITHOS,2019,334:254-272.
APA Liu, Yin.,Xiao, Wenjiao.,Windley, Brian F..,Li, Rongshe.,Ji, Wenhua.,...&Zhang, Haidi.(2019).Late Triassic ridge subduction of Paleotethys: Insights from high-Mg granitoids in the Songpan-Ganzi area of northern Tibet.LITHOS,334,254-272.
MLA Liu, Yin,et al."Late Triassic ridge subduction of Paleotethys: Insights from high-Mg granitoids in the Songpan-Ganzi area of northern Tibet".LITHOS 334(2019):254-272.

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