首页|Early Triassic Volcanic Rocks in the Western Yarlung Zangbo Suture Zone:Implications for the Opening of the Neo-Tethys Ocean

Early Triassic Volcanic Rocks in the Western Yarlung Zangbo Suture Zone:Implications for the Opening of the Neo-Tethys Ocean

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In this study,zircon U-Pb dating of volcanic rocks from the Zhongba ophiolite of the Yarlung Zangbo Suture Zone(YZSZ)in southern Xizang(Tibet)yielded an age of 247±3 Ma.According to whole rock geochemical and Sr-Nd-Pb isotopic data,the Early Triassic samples could be divided into two groups:Group 1 with P-MORB affinity,showing initial 87Sr/86Sr ratios of 0.70253-0.70602,εNd(t)values of 4.2-5.3,(206Pb/204Pb)t ratios of 16.353-18.222,(207Pb/204Pb)t ratios of 15.454-15.564,and(208Pb/204Pb)t ratios of 35.665-38.136;Group 2 with OIB affinity,showing initial 87Sr/86Sr ratios of 0.70249-0.70513,εNd(t)values of 4.4-4.9,(206Pb/204Pb)t ratios of 17.140-18.328,(207Pb/204Pb)t ratios of 15.491-15.575,and(208Pb/204Pb)t ratios of 36.051-38.247.Group 2 rocks formed by partial melting of the mantle source enriched by a former plume,and assimilated continental crustal material during melt ascension.The formation of Group 1 rocks corresponds to the mixing of OIB melts,with the same components as Group 2 and N-MORBs.The Zhongba Early Triassic rocks belong to the continental margin type ophiolite and formed in the continental-oceanic transition zone during the initial opening of the Neo-Tethys in southern Xizang(Tibet).

riftEarly Triassic magmatismYarlung Zangbo Suture ZoneNeo-TethysSouthern XizangTibet

HE Juan、LI Yalin、HOU Yunling、ZHOU Aorigele、WEI Yushuai、CHEN Xi、DAI Jingen

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School of Civil Engineering and Architecture,West Yunnan University of Applied Sciences,Dali,Yunnan 671006,China

School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100080,China

West Yunnan University of Applied Sciences,Dali,Yunnan 671006,China

MLR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100080,China

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National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaSecond Tibetan Plateau Scientific Expedition and Research programScientific Research Foundation for Advanced Scholars,West Yunnan University of Applied SciencesYunnan Fundamental Research Projects

91955206416030382019QZKK08032022RCKY0004202301AT070012

2024

10.1111/1755-6724.15141

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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