首页|Geochronology and Petrogenesis of Late Carboniferous to Early Permian Basalts in the Central Lhasa Subterrane,Southern Tibet:Implications for the Evolution of the Sumdo Paleo-Tethys Ocean

Geochronology and Petrogenesis of Late Carboniferous to Early Permian Basalts in the Central Lhasa Subterrane,Southern Tibet:Implications for the Evolution of the Sumdo Paleo-Tethys Ocean

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Basalts from the Late Carboniferous to Early Permian are extensively developed in the central Lhasa subterrane,southern Tibet.Studying the petrogenesis of these rocks may have implications for the late Paleozoic arc magmatism along the central Lhasa subterrane uncovering more of the evolution of the Sumdo Paleo-Tethys Ocean and its dynamic mechanism.Basalt samples from the Luobadui Formation in the Leqingla area,NW of Linzhou City in the central Lhasa subterrane,southern Tibet exhibit arc-like geochemical signatures in a subduction-zone tectonic setting characterized by high Al2O3 and low TiO2 contents,fractionated REE patterns with low Nb/La ratios and high LREE concentrations,and negative HFSE anomalies.Based on their higher Th/Ce,Nb/Zr,and lower Ba/Th,Pb/Nd ratios,slightly negative to positiveεNd(t)values,and the relatively high Sr-Pb isotopic compositions,these samples were probably derived from partial melting of a depleted mantle source of garnet+spinel lherzolite,metasomatized by subducted sediments around 297 Ma.Modeling of the trace elements indicates that these basalts experienced fractional crystallization of olivine,clinopyroxene and minor plagioclase during magma ascent and eruption.It is proposed that these Late Carboniferous-Early Permian basalts are associated with the northward subduction of the Sumdo Paleo-Tethys Ocean seafloor along the southern margin of the central Lhasa subterrane.

geochemistrynorthward subductionSumdo Paleo-Tethys OceanLhasa terraneTibet

MA Wang、LIU Yingchao、YANG Zhusen、Jan-Marten HUIZENGA、LI Zhenqing、YUE Longlong、ZHAO Sibo

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

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

MLR Key Laboratory of Metallogeny and Mineral Assessment,Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China

Faculty of Environmental Sciences and Natural Resource Management,Norwegian University of Life Sciences,NO-1432 Ås,Norway

Economic Geology Research Centre(EGRU),College of Science and Engineering,James Cook University,Townsville,Queensland 4811,Australia

Department of Geology,University of Johannesburg,Auckland Park 2006,South Africa

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National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaChina Geological SurveyChina Geological SurveyNational Postdoctoral Research Program of ChinaSecond Tibetan Plateau Scientific Expedition and ResearchXingDian Youth Talent Plan of Yunnan ProvinceUNESCO:IUGS IGCP-662 Program

2022YFF08009034230210792162322422611446694192202242003036DD20243512DD20230008GZC202324892021QZKK0304XDYC-QNRC-2022-0136

2024

10.1111/1755-6724.15178

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(4)