Volume 43 Issue 2
Feb.  2024
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Yu Zhang, Kefu Yu, Shiying Li. U-Pb zircon geochronology of basaltic pyroclastic rocks from the basement beneath the Xisha Islands in the northwestern South China Sea and its geological significance[J]. Acta Oceanologica Sinica, 2024, 43(2): 83-93. doi: 10.1007/s13131-023-2198-2
Citation: Yu Zhang, Kefu Yu, Shiying Li. U-Pb zircon geochronology of basaltic pyroclastic rocks from the basement beneath the Xisha Islands in the northwestern South China Sea and its geological significance[J]. Acta Oceanologica Sinica, 2024, 43(2): 83-93. doi: 10.1007/s13131-023-2198-2

U-Pb zircon geochronology of basaltic pyroclastic rocks from the basement beneath the Xisha Islands in the northwestern South China Sea and its geological significance

doi: 10.1007/s13131-023-2198-2
Funds:  The National Natural Science Foundation of China under contract Nos 42030502, 42090041 and 42166003, the Guangxi Scientific Projects under contract Nos AD17129063 and AA17204074, the Guangxi Youth Science Fund Project under contract 2019GXNSFBA185016; the Ph.D. Research Start-up Foundation of Guangxi University under contract No. XBZ170339.
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  • Corresponding author: Dr. Kefu Yu E-mail: kefuyu@scsio.ac.cn
  • Received Date: 2022-11-17
  • Accepted Date: 2023-03-27
  • Available Online: 2024-02-29
  • Publish Date: 2024-02-01
  • As one of the micro-blocks dispersed in the South China Sea (SCS), the basement of the Xisha Islands has rarely been drilled because of the thick overlying Cenozoic sediments, which has led to a confused understanding of the pre-Cenozoic basement of the Xisha Islands. Well CK-1, a kilometer-scale major scientific drill in the Xisha Islands in the northwestern SCS, penetrated thick reefal limestone (0–888.4 m) and the underlying basement rocks (888.4–901.4 m). In this study, we present the zircon U-Pb ages of basement basaltic pyroclastic rocks from Well CK-1 in the Xisha Islands of the northwestern SCS to investigate the basement nature of the Xisha micro-block. The basement of Well CK-1 consists of basaltic pyroclastic rocks on the seamount. The zircon grains yielded apparent ages ranging from ca. 2 138.9 Ma to ca. 36 Ma. The old group of zircon grains from Well CK-1 was considered to be inherited zircons. Two Cenozoic zircons gave a weighted mean 206Pb/238U age of (36.3 ± 1.1) Ma, Mean Squared Weighted Deviations (MSWD) = 1.2, which may represent the maximum age of the volcano eruption. The Yanshanian inherited zircons (116.9–105.7 Ma and 146.1–130.2 Ma) from Well CK-1 are consistent with the zircons from Well XK-1, indicating that the basement of Chenhang Island may be similar to that of Well XK-1. We propose that the Xisha micro-block may have developed on a uniform Late Jurassic metamorphic crystalline basement, intruded by Cretaceous granitic magma.
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