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RETRACTED-Late Permian to early Triassic gabbro in North Lhasa, Tibet: evidence for plume – subduction-zone interaction of the Palaeo-Tethys ocean

Published online by Cambridge University Press:  19 January 2023

Meng-Long Duan ,
Chao-Ming Xie Open the ORCID record for Chao-Ming Xie [Opens in a new window] ,
Bin Wang ,
Yu-Hang Song ,
Wen-qing Li  and
Yu-jie Hao
Meng-Long Duan
Affiliation:
College of Earth Sciences, Jilin University, Changchun 130061, China Research Center for Tibetan Plateau, Jilin University, Changchun, Jilin 130061, China
Chao-Ming Xie*
Affiliation:
College of Earth Sciences, Jilin University, Changchun 130061, China Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources, Jilin University, Changchun 130061, China Research Center for Tibetan Plateau, Jilin University, Changchun, Jilin 130061, China
Bin Wang
Affiliation:
College of Earth Sciences, Jilin University, Changchun 130061, China Research Center for Tibetan Plateau, Jilin University, Changchun, Jilin 130061, China
Yu-Hang Song
Affiliation:
College of Earth Sciences, Jilin University, Changchun 130061, China Research Center for Tibetan Plateau, Jilin University, Changchun, Jilin 130061, China
Wen-qing Li
Affiliation:
Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources, Jilin University, Changchun 130061, China
Yu-jie Hao
Affiliation:
Key Laboratory of Mineral Resources Evaluation in Northeast Asia, Ministry of Natural Resources, Jilin University, Changchun 130061, China
*
Author for correspondence: Chao-Ming Xie, Email: xcmxcm1983@126.com
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Abstract

The Palaeo-Mesozoic geodynamic evolution of the Tangjia–Sumdo accretionary complex belt, which separates the North and South Lhasa Terrane, remains controversial. Moreover, the lack of geological records restricts the understanding of the evolution of the Sumdo Palaeo-Tethys Ocean from the middle Permian until the middle Triassic. Here we present zircon U–Pb geochronology, whole-rock geochemistry and Sr–Nd–Hf isotopic compositions of the Yeqing gabbro. Zircon U–Pb geochronology yields ages from 254 ± 1 to 249 ± 1 Ma. In situ Hf isotopic analyses yield ϵ Hf(t) values of −0.2 to +6.3. These samples have high TiO2 (3.69 wt %) and P2O5 (0.78 wt %) contents, with typical patterns like ocean island basalt (OIB). Besides, they are classified as high-Nb basalts (HNBs) based on the high content of Nb (45.3–113.5 ppm). Whole-rock Sr–Nd isotopic compositions are similar to OIB, with initial 87Sr/86Sr of 0.7047–0.7054, 143Nd/144Nd of 0.512526–0.512647 and ϵ Nd(t) of 0.3–2.7. These signatures suggest that the Yeqing gabbro is mainly derived from low-degree melting of the garnet lherzolite mantle. Based on field observations of HNBs intruding into the continental margin and their geochemical characteristics, we infer that the Yeqing gabbro was generated in a subduction environment. Combined with the regional geology of the subduction environment and the evolution of oceanic islands in the Sumdo Palaeo-Tethys Ocean, we propose that the Yeqing gabbro may represent a product of the asthenosphere upwelling through a slab window produced by subduction of seismic ridge in the Sumdo Palaeo-Tethys Ocean, called plume – subduction-zone interaction, during the late Permian to early Triassic.

Keywords

Lhasa terraneSumdo Palaeo-Tethys OceanOIBgeochemistrygeochronology
Type
Review Article
Information
Geological Magazine , Volume 160 , Issue 2 , February 2023 , pp. 393 - 408
Copyright
© The Author(s), 2023. Published by Cambridge University Press

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