首页|An Overview on the Composition and Age of Upper Crust of Proto-Tethyan Lajishan Intra-oceanic Arc,NE Tibet Plateau

An Overview on the Composition and Age of Upper Crust of Proto-Tethyan Lajishan Intra-oceanic Arc,NE Tibet Plateau

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  • 国家科技期刊平台
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Identification and anatomy of oceanic arcs within ancient orogenic belt are significant for better understanding the tectonic framework and closure process of paleo-ocean basin.This article summarizes the geological,geochemical,and geochronological characteristics of upper crust of Proto-Tethyan Lajishan intra-oceanic arc and provides new data to constrain the subduction evolution of the South Qilian Ocean.The intra-oceanic arc volcanic rocks,including intermediate-mafic lava,breccia,tuff,and minor felsic rocks,are distributed along southern part of the Lajishan ophiolite belt.Geochemical and isotopic compositions indicate that the intermediate-mafic lava were originated from depleted mantle contaminated by sediment melts or hydrous fluids,whereas the felsic rocks were likely generated by partial melting of juvenile mafic crust in intra-oceanic arc setting.Zircons from felsic rocks yield consistent and concordant ages ranging from 506 to 523 Ma,suggesting these volcanic rocks represent the relicts of upper crust of the Cambrian intra-oceanic arc.Combined with the Cambrian forearc ophiolite and accretionary complex,we suggest that the Cambrian intra-oceanic arc in the Lajishan ophiolite belt is belonging to the intra-oceanic arc system which was generated by south-directed subduction in the South Qilian Ocean at a relatively short interval between approximately 530 and 480 Ma.

volcanic rocksintra-oceanic arcU-Pb ageLajishan ophiolite beltSouth Qilian OceanProto-Tethyan realm

FU Changlei、HE Xiaohu、YAN Zhen、Jonathan C.AITCHISON、XIAO Wenjiao、WANG Bingzhang、LI Wufu、LI Yusen

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SinoProbe Laboratory,Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China

Key Laboratory of the Northern Qinghai-Tibet Plateau Geological Processes and Mineral Resources,Qinghai Geological Survey Institute,Xining 810012,China

Department of Geology,School of Earth Sciences,Yunnan University,Kunming 650091,China

School of Earth and Environmental Sciences,University of Queensland,Brisbane 4072,Australia

Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China

State Key Laboratory of Lithospheric Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China

School of Earth Science and Resources,China University of Geosciences,Beijing 100083,China

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constructive comments from editors and reviewersChina Geological SurveyNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaBureau of Geological Exploration and Development of Qinghai ProvinceXingdian Scholar Fund of Yunnan ProvinceChina Postdoctoral Science FoundationHighlevel Talents Project of Qinghai Province

DD202216494223030842072266[2022]32C62130011552021M691702

2024

10.1111/1755-6724.15137

地质学报(英文版)
中国地质学会

地质学报(英文版)

CSTPCD
影响因子：1.414
ISSN：1000-9515
年,卷(期)：2024.98(2)
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