天然气地球科学

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琼东南盆地中央峡谷沉积物源探讨

张道军,张迎朝,邵磊,刘新宇,王亚辉,何小胡,崔宇驰   

  1. 1.中海石油(中国) 有限公司湛江分公司,广东 湛江 524057;
    2.同济大学海洋地质国家重点实验室,上海 200092
  • 收稿日期:2017-05-23 修回日期:2017-08-12 出版日期:2017-10-10 发布日期:2017-10-10
  • 作者简介:张道军(1973-),男,江苏徐州人,高级工程师,硕士,主要从事层序地层学及储层沉积学研究. E-mail:zhangdaojun@cnooc.com.cn.
  • 基金资助:

    国家科技重大专项项目(编号:2016ZX05026-002;2017ZX05026-005);国家自然科学基金项目(编号: 91128207;41576059)联合资助.

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

Zhang Dao-jun,Zhang Ying-zhao,Shao Lei,Liu Xin-yu,Wang Ya-hui,He Xiao-hu,Cui Yu-chi   

  1. 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:2017-05-23 Revised:2017-08-12 Online:2017-10-10 Published:2017-10-10

摘要:

琼东南盆地中央峡谷沉积物来源是南海地区沉积学研究中的热点问题。研究采用稀土元素及碎屑锆石年龄等方法,对琼东南盆地中央峡谷上中新统—上新统以及盆地基底和周边可能源区开展对比分析。研究发现,中央峡谷西侧上中新统—上新统多数样品呈现出Eu元素正异常,峡谷东侧样品则以Eu元素的负异常为主,并且随着时代变新,呈现Eu元素负异常的样品数量增多;同时,样品中碎屑锆石年龄谱系也呈现规律性变化,峡谷西侧沉积物相对包含的古生代及元古代等古老锆石比峡谷东侧多,峡谷东侧的碎屑锆石年龄则以燕山期和印支期2个中生代年龄峰值为主。结果显示,越南中北部印支期的板块拼合带是中央峡谷的重要物源区,控制着中央峡谷的沉积充填,海南岛是中央峡谷另一重要物源区,其在中央峡谷西侧为次要物源,但是到峡谷东侧则为主要物源区。

关键词: 南海, 中新世, 物源, 稀土元素, 锆石定年

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.
 

Key words: South China Sea, Miocene, Provenance, Rare Earth Elements, Zircon U-Pb dating

中图分类号: 

  • TE121.3
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