南海中沙群岛海域表层沉积物粒度特征及其输运趋势

陈俊锦, 张经纬, 刘时桥, 陈万利, 秦永鹏, 吴时国. 南海中沙群岛海域表层沉积物粒度特征及其输运趋势[J]. 海洋地质与第四纪地质, 2022, 42(2): 15-27. doi: 10.16562/j.cnki.0256-1492.2021090901
引用本文: 陈俊锦, 张经纬, 刘时桥, 陈万利, 秦永鹏, 吴时国. 南海中沙群岛海域表层沉积物粒度特征及其输运趋势[J]. 海洋地质与第四纪地质, 2022, 42(2): 15-27. doi: 10.16562/j.cnki.0256-1492.2021090901
CHEN Junjin, ZHANG Jingwei, LIU Shiqiao, CHEN Wanli, QIN Yongpeng, WU Shiguo. Grain size distribution pattern of surface sediments and its implications for transportation trend: A case from the waters off Zhongsha Islands, the South China Sea[J]. Marine Geology & Quaternary Geology, 2022, 42(2): 15-27. doi: 10.16562/j.cnki.0256-1492.2021090901
Citation: CHEN Junjin, ZHANG Jingwei, LIU Shiqiao, CHEN Wanli, QIN Yongpeng, WU Shiguo. Grain size distribution pattern of surface sediments and its implications for transportation trend: A case from the waters off Zhongsha Islands, the South China Sea[J]. Marine Geology & Quaternary Geology, 2022, 42(2): 15-27. doi: 10.16562/j.cnki.0256-1492.2021090901

南海中沙群岛海域表层沉积物粒度特征及其输运趋势

  • 基金项目: 国家自然科学基金-广东省联合基金重点基金项目“南沙海区减薄陆壳裂陷盆地构造演化及特色深水油气系统”(U1701245);中国地质调查局项目“海南中沙群岛海域海洋区域地质调查”(DD20191027);中国科学院边缘海与大洋地质重点实验室资助项目“西沙群岛宣德孤立碳酸盐台地周缘深水沉积体系研究”(OMG202010);中国工程科技发展战略海南研究院咨询研究项目“海洋地球物理大数据平台建设及其在南海资源勘探开发战略规划中的应用”(20-NH-ZT-01)
详细信息
    作者简介: 陈俊锦(1996—),男,硕士研究生,主要从事海洋地质、海洋地球物理研究,E-mail:chenjj@idsse.ac.cn
    通讯作者: 张经纬(1996—),男,助理工程师,主要从事海底地质研究,E-mail:17801040683@163.com
  • 中图分类号: P736.21

Grain size distribution pattern of surface sediments and its implications for transportation trend: A case from the waters off Zhongsha Islands, the South China Sea

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  • 对南海中沙群岛海域232个表层沉积物样品进行了粒度分析,以探讨研究区沉积物来源、沉积环境和输运趋势。根据Folk沉积物命名法,将研究区沉积物划分为砂、粉砂质砂、砂质粉砂、砂质泥、粉砂和泥等6种类型,以砂质泥和泥为主,粒径较粗、分选较好的沉积物主要分布在中沙台地海域。通过对组分含量、粒度参数和水深进行聚类分析和主成分分析,综合考虑沉积物来源和海底地形地貌的影响,将研究区划分为5类沉积区:台地区、台地阶地区、台地周缘斜坡区、海槽海岭区和深海盆地区结合沉积环境分区进行了粒径趋势分析,研究显示,沉积物主要以中沙台地和西沙隆起海域为中心向周缘输运,在中沙海槽海域形成汇聚区。研究区沉积物输运格局主要受季风、海流、潮汐和波浪等因素的共同控制,与沉积物来源、海底地形地貌和实测水动力条件相吻合。

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  • 图 1  研究区地理位置及采样站位

    Figure 1. 

    图 2  研究区表层沉积物粒级组分百分含量分布

    Figure 2. 

    图 3  研究区表层沉积物粒度参数分布

    Figure 3. 

    图 4  研究区表层沉积物分类三元图

    Figure 4. 

    图 5  研究区表层沉积物类型空间分布

    Figure 5. 

    图 6  表层沉积物R型聚类分析谱系

    Figure 6. 

    图 7  研究区沉积环境分区

    Figure 7. 

    图 8  研究区沉积物净输运趋势

    Figure 8. 

    图 9  研究区MX1—MX4站位底流流速及流向

    Figure 9. 

    表 1  主成分分析因子载荷矩阵

    Table 1.  Principal component analysis factor loading matrix

    变量因子1因子2因子3因子4
    砂含量−0.967−0.0640.165−0.181
    平均粒径0.9550.101−0.2010.183
    粉砂含量0.9530.141−0.1010.186
    黏土含量0.937−0.050−0.2470.164
    峰态−0.0600.9800.0510.033
    分选系数0.2090.943−0.0460.166
    偏态−0.3060.0240.926−0.218
    水深0.3920.211−0.2810.850
    下载: 导出CSV

    表 2  研究区各沉积环境分区相关参数统计值

    Table 2.  Statistical values of relevant parameters in subareas of the study area

    沉积环
    境分区
    主要底质
    类型
    砂/%粉砂/%黏土/%平均粒径/Φ分选系数偏态峰态水深/m
    砂、粉砂质砂72.98(0~
    100)
    19.01(0~
    62.89)
    8.01(0~
    43.13)
    3.04(0.61~
    7.81)
    1.62(0.58~
    2.74)
    1.51(−0.66~
    2.7)
    2.38(0.76~
    3.49)
    108(24~
    475)
    砂质粉砂51.19(37.18~
    83.65)
    39.51(13.39~
    49.57)
    9.30(2.96~
    13.25)
    4.36(2.63~
    5.07)
    2.10(1.9~
    2.28)
    2.16(2.08~
    2.28)
    2.95(2.83~
    3.06)
    373(312~
    481)
    砂质粉砂、砂质泥14.91(0~
    63.62)
    54.78(29.1~
    67.8)
    30.31(7.27~
    45.46)
    6.68(3.67~
    7.81)
    2.16(1.67~
    3.16)
    0.30(−1.23~
    2.39)
    2.63(2.07~
    3.65)
    1904(386~
    3352)
    砂质泥、泥10.14(0~
    41.62)
    56.09(38.56~
    66.91)
    33.77(14.85~
    43.98)
    7.01(5.07~
    7.8)
    2.08(1.57~
    3.05)
    −0.39(−1.32~
    2.1)
    2.56(1.97~
    3.51)
    2784(1080~
    3796)
    砂质泥18.69(6.54~
    42.23)
    53.26(37.77~
    59.39)
    28.05(19.67~
    36.14)
    6.50(5.25~
    7.25)
    2.30(1.95~
    3.06)
    −0.49(−1.29~
    1.77)
    2.80(2.42~
    3.52)
    4077(3631~
    5230)
     注:平均值(最小值~最大值)。
    下载: 导出CSV
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收稿日期:  2021-09-09
修回日期:  2021-09-23
刊出日期:  2022-04-28

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