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现代地质 ›› 2022, Vol. 36 ›› Issue (01): 77-87.DOI: 10.19657/j.geoscience.1000-8527.2021.166

• 海洋地质学 • 上一篇    下一篇

湛江湾海域表层沉积物稀土元素特征及其物源指示意义

远继东1,2(), 姜正龙2, 代友旭1, 郝连成1, 张健康1, 张德程1,3, 郑立龙1()   

  1. 1. 中国地质调查局烟台海岸带地质调查中心,山东 烟台 264004
    2. 中国地质大学(北京) 海洋学院,北京 100083
    3. 中国地质大学(北京) 地球科学与资源学院, 北京 100083
  • 收稿日期:2021-05-28 修回日期:2021-11-09 出版日期:2022-02-10 发布日期:2022-03-08
  • 通讯作者: 郑立龙
  • 作者简介:郑立龙,男,1988年出生,构造地质学专业,主要从事海岸带综合地质调查与研究。Email: zhenglilong1020@126.com
    远继东,男,硕士研究生,1993年出生,资源与环境专业,主要从事海岸带综合地质调查与研究。Email: 787312820@qq.com
  • 基金资助:
    中国地质调查局项目“雷州半岛东部海岸带综合地质调查”(DD20208011)

REE Characteristics in Surface Sediments of Zhanjiang Bay and their Provenance Indicating Significance

YUAN Jidong1,2(), JIANG Zhenglong2, DAI Youxu1, HAO Liancheng1, ZHANG Jiankang1, ZHANG Decheng1,3, ZHENG Lilong1()   

  1. 1. Yantai Center of Coastal Zone Geological Survey, China Geological Survey, Yantai, Shandong 264004, China
    2. School of Ocean Sciences, China University of Geosciences, Beijing 100083, China
    3. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
  • Received:2021-05-28 Revised:2021-11-09 Online:2022-02-10 Published:2022-03-08
  • Contact: ZHENG Lilong

摘要:

通过对湛江湾近海海域表层沉积物样品粒度和稀土元素(REE)测试分析,系统地研究海域沉积物稀土元素地球化学特征并探讨其物质来源。结果表明,研究区沉积物的稀土元素含量变化较大,平均值为163.23 μg/g,湾外的REE含量(168.61 μg/g)高于湾内的REE含量(142.17 μg/g);不同类型沉积物的稀土元素含量存在差异,但都表现为随沉积物粒度变细呈增长的趋势。(La/Yb)N变化范围在4.80~11.76之间,平均值为8.01;δEu变化范围为0.22~0.61,平均值为0.45;δCe变化范围为0.98~1.07,平均值为1.03;样品均具有典型的轻稀土元素(LREE)富集、重稀土元素(HREE)均一、Eu负异常明显的陆源物质特征。球粒陨石标准化配分曲线及特征参数分析显示,湛江湾沉积物与鉴江、漠阳江、珠江附近海域沉积物近似同源,物源主要来自华南大陆的花岗岩以及雷州半岛北部玄武岩和湛江组(Qp1z)、北海组(Qp2b)的松散沉积物。

关键词: 表层沉积物, 稀土元素, 物源, 湛江湾海域

Abstract:

Sediment geochemical characteristics and provenance in offshore Zhanjiang Bay were systematically studied by analyzing the grain size and rare earth elements (REEs) of surface sediment samples. The results show that the REE contents of sediments vary greatly (average 163.23 μg/g). The REE contents of outside the bay (168.61 μg/g) is higher than those in the bay (142.17 μg/g). The REE contents in different sediment types vary, which increase with the decrease of grain size. (La/Yb)N ranges from 4.80 to 11.76 (average 8.01); Europium anomaly (δEu) value ranges from 0.22 to 0.61 (average 0.45); Cerium anomaly (δCe) value ranges from 0.98 to 1.07 (average 1.03). The samples are characterized by typical light rare earth element (LREE) enrichment, homogeneity of heavy rare earth element (HREE) and distinct negative Eu anomaly, indicating that these sediments are terrigenous. Chondrite-normalized REE curves and REE parameters show that the sediments in Zhanjiang Bay are approximately homologous with those from around Jianjiang, Moyangjiang and Pearl Rivers, and are mainly sourced from granitoids in South China, basalts in northern Leizhou Peninsula, and unconsolidated sediments of the Zhanjiang and Beihai Formations.

Key words: surface sediment, rare earth element, provenance, Zhanjiang Bay

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