安山岩,锆石U-Pb年龄,Hf同位素,早古生代,原特提斯洋,海南岛
," /> 安山岩,锆石U-Pb年龄,Hf同位素,早古生代,原特提斯洋,海南岛
,"/>  andesite,zircon U-Pb age,Hf isotope,Early Paleozoic,Proto-Tethys Ocean,Hainan Island ,"/> <p class="MsoNormal"> Evolution of the Proto-Tethys Ocean in Hainan Island: Evidence from Zircon U-Pb Geochronology and Hf Isotopic Compositions of Andesite <p class="MsoNormal"> #br#

Journal of Jilin University(Earth Science Edition) ›› 2023, Vol. 53 ›› Issue (5): 1483-1498.doi: 10.13278/j.cnki.jjuese.20210399

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Evolution of the Proto-Tethys Ocean in Hainan Island: Evidence from Zircon U-Pb Geochronology and Hf Isotopic Compositions of Andesite

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Du Yujing1, Zhou Yun1, Liu Xijun1, 2, Cai Yongfeng1, 2, Song Hongxing1, Zhao Yongshan1   

  1. 1. College of Earth Sciences/Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration, Guilin University of

    Technology, Guilin 541004, Guangxi, China

    2. Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources in Guangxi,Guilin University of Technology, Guilin 541004, Guangxi, China

  • Online:2023-09-26 Published:2023-10-31
  • Supported by:

    Supported by the National Natural Science Foundation of China (41503021, 92055208) and the Natural Science Foundation of Guangxi (2020GXNSFGA297003)

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Abstract:

Hainan Island is located at the intersection of Pacific, Indo-Australian and Eurasian plates. It is an ideal location to reveal the tectonic evolution of plate tectonics. In order to gain a better understanding of the Early Paleozoic tectonic evolution of the island, systematic zircon U-Pb geochronological and Hf isotopic analyses of the andesite from the northwestern Hainan Island have been carried out. The results of zircon U-Pb dating show that two representative andesite samples yield ages of LA-ICP-MS(448±5) Ma and (447±11) Ma, respectively. This suggests that Early Paleozoic (Late Ordovician) magmatism occurred on the Island. In-situ zircon Hf isotopic results show that the εHf(t) values of the andesites are -16.48-5.22 and their two-stage model ages (TDM2) are 2 030-953 Ma. Combined with regional geological data, it is evident that the andesites were produced by mixture of mafic and felsic magmas, and their formation is related to the subduction of the Proto-Tethys Oceanic crust.


Key words:  andesite')">

 andesite, zircon U-Pb age, Hf isotope, Early Paleozoic, Proto-Tethys Ocean, Hainan Island

CLC Number: 

  • P597
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