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    南海西部晚中生代岩浆弧:KP1-1-1井碎屑锆石约束

    范彩伟 胡林 胡潜伟

    范彩伟, 胡林, 胡潜伟, 2022. 南海西部晚中生代岩浆弧:KP1-1-1井碎屑锆石约束. 地球科学, 47(7): 2328-2336. doi: 10.3799/dqkx.2022.033
    引用本文: 范彩伟, 胡林, 胡潜伟, 2022. 南海西部晚中生代岩浆弧:KP1-1-1井碎屑锆石约束. 地球科学, 47(7): 2328-2336. doi: 10.3799/dqkx.2022.033
    Fan Caiwei, Hu Lin, Hu Qianwei, 2022. Late Mesozoic Magmatic Arc: Constraints from Well KP1-1-1 Detrital Zircon U-Pb Data, South China Sea. Earth Science, 47(7): 2328-2336. doi: 10.3799/dqkx.2022.033
    Citation: Fan Caiwei, Hu Lin, Hu Qianwei, 2022. Late Mesozoic Magmatic Arc: Constraints from Well KP1-1-1 Detrital Zircon U-Pb Data, South China Sea. Earth Science, 47(7): 2328-2336. doi: 10.3799/dqkx.2022.033

    南海西部晚中生代岩浆弧:KP1-1-1井碎屑锆石约束

    doi: 10.3799/dqkx.2022.033
    基金项目: 

    中海石油(中国)有限公司重大科技专项 KJZH-2021-0003-00

    详细信息
      作者简介:

      范彩伟(1973-), 男, 教授级高级工程师, 主要从事海洋油气地质研究.ORCID: 0000-0003-1517-6255.E-mail: fancw@cnooc.com.cn

    • 中图分类号: P597.3

    Late Mesozoic Magmatic Arc: Constraints from Well KP1-1-1 Detrital Zircon U-Pb Data, South China Sea

    • 摘要: 晚中生代是古太平洋板块俯冲和南海北部岩浆弧发育时期,开展珠江口盆地KP1-1-1井钻遇的浅变质砂岩的近源沉积研究有助于揭示岩浆弧源区的构造特点.根据LA-ICPMS碎屑锆石分析,KP1-1-1浅变质砂岩中存在129~155 Ma、155~172 Ma和172~196 Ma三个年龄组分,这一特点与区域上构造岩浆事件一致.碎屑岩浆锆石流体活动性元素富集(如U和Th),高场强元素亏损(如Nb、Hf和Ti);元素组成U/Yb(0.34~3.92)、Sc/Yb(0.48~2.28)、Hf/Th(14.4~186.6)和Th/Nb(24.3~462.7)具有大陆岩浆弧特点;计算的锆石Ti温度为551~786℃,表明属于低温弧岩浆作用.碎屑岩中172~196 Ma锆石组分记录了东沙-大仑-雁荡岩浆弧向西南的进一步延伸,与侏罗纪早期古太平洋斜向俯冲到华南陆块之下有关.155~172 Ma岩浆锆石与古板块强烈俯冲有关,对应于华南165~150 Ma大规模花岗质岩浆活动.129~155 Ma时期板块俯冲减弱或俯冲带后撤,可与浙闽同时期板内强烈火山活动对比.碎屑岩中测得最年轻年龄为128.8 Ma,表明KP1-1-1钻遇浅变质砂岩形成时代晚于128 Ma,应属于白垩系,不是传统上认为的下古生界岩系.

       

    • 图  1  南海北部主要盆地、KP1-1-1井位和砂岩岩性照片

      据中海石油(中国)有限公司湛江分公司,2021.《南海西部海域油气勘探年报(2020年度)》

      Fig.  1.  Main Cenozoic basins of the northern South China Sea with KP1-1-1 sandstone locality and lithology

      图  2  南海珠江口盆地KP1-1-1井碎屑锆石U-Pb年龄谐和图和频谱图

      Fig.  2.  Zircon U-Pb concordia diagram and age histogram of Well KP1-1-1 sandstone from the Pearl River Mouth Basin, South China Sea

      图  3  珠江口盆地KP1-1-1井碎屑锆石相关图解

      a. Th/U比值;b~d. 构造环境判别,图b和图c底图据Grimes et al.(2015),图d底图据Yang et al.(2012);e. 锆石类型,底图据Grimes et al.(2007);f. 锆石Ti温度

      Fig.  3.  Relative diagrams of zircons for Well KP1-1-1 from the Pearl River Mouth Basin

      图  4  珠江口盆地KP1-1-1井浅变质砂岩重矿物组成特点

      Fig.  4.  Characteristics of heavy minerals KP1-1-1 sandstone from the Pearl River Mouth Basin

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