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2019 Vol. 25, No. 5
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LI Zhenglin, LIU Xijun, XIAO Wenjiao, BAO Houyin, SHI Yu, LIU Lei, LIAO Shuai, QIN Xianzhu. GEOCHRONOLOGY, GEOCHEMISTRY AND HF ISOTOPES OF VOLCANIC ROCKS IN PINGXIANG AREA, SOUTHWEST GUANGXI: IMPLICATIONS FOR THE LATEST STAGE OF PALEO-TETHYAN OCEAN NORTHWARD SUBDUCTION[J]. Journal of Geomechanics, 2019, 25(5): 932-946. doi: 10.12090/j.issn.1006-6616.2019.25.05.076
Citation: LI Zhenglin, LIU Xijun, XIAO Wenjiao, BAO Houyin, SHI Yu, LIU Lei, LIAO Shuai, QIN Xianzhu. GEOCHRONOLOGY, GEOCHEMISTRY AND HF ISOTOPES OF VOLCANIC ROCKS IN PINGXIANG AREA, SOUTHWEST GUANGXI: IMPLICATIONS FOR THE LATEST STAGE OF PALEO-TETHYAN OCEAN NORTHWARD SUBDUCTION[J]. Journal of Geomechanics, 2019, 25(5): 932-946. doi: 10.12090/j.issn.1006-6616.2019.25.05.076
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GEOCHRONOLOGY, GEOCHEMISTRY AND HF ISOTOPES OF VOLCANIC ROCKS IN PINGXIANG AREA, SOUTHWEST GUANGXI: IMPLICATIONS FOR THE LATEST STAGE OF PALEO-TETHYAN OCEAN NORTHWARD SUBDUCTION

  • 1.

    Guangxi Hidden Mineral Exploration Center, College of Earth Sciences, Guilin University of Technology, Guilin 541004, Guangxi, China

  • 2.

    Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, China

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Received Date:  20 August 2019
Revised Date:  01 October 2019
Publish Date:  31 October 2019
    Abstract

  • Pingxiang area located in the southwest margin of Souch China Block (SCB) and north side of the collision zone between the South China and Indochina plate, tectonically belongs to the eastern part of the Tethyan tectonic domain. The Triassic intermediate-acid volcanics exposed in the Pingxiang area are continental arcs formed during the subduction of the Paleo-Tethysan ocean. They carried a large number of captured zircons sourced from the basement of SCB, which provided important information for the tectono-thermal events in SCB. In this paper, the geochronology, geochemistry and zircon Hf isotope studies were carried out on the dacites from Triassic Beisi Formation in Pingxiang area, and a weighted average age yeild 227.8±1.3 Ma from one dacite sample was obtained, representing its crystallization age. Geochemically, the dacites have high contents of SiO2, K2O, and low MgO, MnO and CaO contents, enriched in LILEs (Rb, Ba, Th and U) and depleted in HFSEs (Nb, Ta), which shows a typical characteristics of island arc magma, representing the continental arc products formed by the northward subduction of the Paleo-Tethysan ocean. The U-Pb age frequency distribution of captured zircons from another two dacite samples is mainly concentrated in (1)1010~800 Ma (peak 900 Ma), and the zircon εHf(t) value is 4.5~15.1, responding to the tectonic evolution events of the convergence-rifting-reconvergence between the Yangtze and Cathaysia blocks and the participation of the mantle-derived magma; (2) 720~620 Ma (peak 680 Ma), responding to the re-rifting of the Yangtze-Cathaysia blocks; (3) 490~400 Ma (peak 450 Ma), the zircon εHf(t) value is 2.2~-7.8, responding to the tectono-magmatic event of crust-mantle interaction related to the Caledonian movement in Early Paleozoic in SCB; (4) 280~230 Ma (peak 250 Ma), the zircon εHf(t) value is -13.6~-16.5, and the crustal model age is 2.3~2.1 Ga, which represents the magmatic event of the Paleo-Tethysan Ocean final subduction to closure between Indochina and South China. The study results reveal the dacites from Beisi formation have an intimate affinity with SCB, and its crystallization age constrains the latest time of the Paleo-Tethysan Ocean subduction ending to closure between SCB and Indochina block at least last to Middle to Late Triassic.

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