Sedimentary provenance in the Central Canyon of Qiongdongnan Basin in the northern South China Sea

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  • 1.Zhanjiang Branch of China National Offshore Oil Corporation(CNOOC) Limited,Zhanjiang 524057,China;
    2.State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China

Received date: 2017-05-23

  Revised date: 2017-08-12

  Online published: 2017-10-10

Abstract

Provenance studies of the Central Canyon,Qiongdongnan Basin provide significant insights into sedimentology research of the South China Sea (SCS).A suite of geochemical approaches mainly including Rare Earth Elemental (REE) analysis and detrital zircon U-Pb dating has been systematically applied to the comparison between our Upper Miocene-Pliocene Central Canyon samples and the Qiongdongnan basement as well as its surrounding potential source areas.The REE patterns indicate that the western Central Canyon is generally characterized by positive Eu anomaly in contrast to the negative Eu anomaly of its eastern side during the Late Miocene-Pliocene period.Additionally,samples bearing negative Eu anomaly have become more dominant within the younger geological strata for the entire canyon.U-Pb chronology results suggest a wide Proterozoic to Mesozoic age range with the complex peak distribution of Yanshanian,Indosinian,Caledonian and Jinningian periods.For most of the western samples,their age signatures are older than the eastern which mainly shows distinguishable peaks of Yanshanian and Indosinian period.Conclusively,our data implies contributions from two important sources:(Ⅰ) the Indosinian collision orogenic belt in central-northern Vietnam affecting the entire Central Canyon;(Ⅱ) the Hainan Island particularly as an eastern provenance area.
 

Cite this article

Zhang Dao-jun,Zhang Ying-zhao,Shao Lei,Liu Xin-yu,Wang Ya-hui,He Xiao-hu,Cui Yu-chi . Sedimentary provenance in the Central Canyon of Qiongdongnan Basin in the northern South China Sea[J]. Natural Gas Geoscience, 2017 , 28(10) : 1574 -1581 . DOI: 10.11764/j.issn.1672-1926.2017.08.012

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