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DOI: https://doi.org/10.11978/2025001

东北印度洋90°E海岭表层沉积物碳酸钙组成与影响因子

  • 杜恕环 ,
  • 向荣 ,
  • 苏翔 ,
  • 张兰兰 ,
  • 潘子锐 ,
  • 谢金沃 ,
  • 罗传秀 ,
  • 万随
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  • 1.       中国科学院边缘海与大洋地质重点实验室，中国科学院南海海洋研究所，广东 广州 510301;

    2.       热带海洋环境与岛礁生态全国重点实验室，中国科学院南海海洋研究所，广东 广州 510301;

    3.       中国科学院大学, 北京 100049;

    4.       广州大学地理科学与遥感学院, 广东 广州 510006

收稿日期: 2025-01-01

  修回日期: 2025-03-07

  网络出版日期: 2025-03-10

基金资助

海南省科技计划三亚崖州湾科技城联合项目(2021JJLH0048);广东省自然科学基金(2023A1515010705, 2023A1515011955)；中国科学院南海海洋研究所自主一体化项目(SCSIO2023HC07)；国家自然科学基金项目（42176082）

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Calcium Carbonate Composition of Surface Sediments and Influencing Factors in the 90°E Ridge of the Northeast Indian Ocean

  • Du Shu-Huan
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  • 1. Key Laboratory of Ocean and Marginal Sea Geology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guang zhou 510301, China;

    2. State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;

    3. University of Chinese Academy of Sciences, Beijing 100049, China;

    4. School of Geography and Remote Sensing, Guangzhou University, Guangzhou 510006, China


Received date: 2025-01-01

  Revised date: 2025-03-07

  Online published: 2025-03-10

Supported by

Hainan Provincial Joint Project of Sanya Yazhou Bay Science and Technology City (2021JJLH0048); the Guangdong Basic and Applied Basic Research Foundation (2023A1515010705, 2023A1515011955)；Independent Integration Program, South China Sea Institute of Oceanography, Chinese Academy of Sciences (SCSIO2023HC07); National Natural Science Foundation of China (42176082)

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摘要

通过对东北印度洋90°E海岭及其临近海域表层沉积物的碳酸钙组成及其空间分布特征的研究，厘清了海岭区不同水深沉积物碳酸钙主要来源，揭示东北印度洋表层沉积物碳酸钙影响因子及其变化机制。基于10个表层沉积物样品的全样碳酸钙及其分粒径碳酸钙测试，结合扫描电镜显微特征与定量统计数据，发现海岭区碳酸钙含量变化在36.95% -74.76%之间，平均含量56.05%，可划分为30%-45%、45%-60%和60%-75%三个等级，碳酸钙区域性分布的影响因子具有多样性。水深在3000米以上的站位，碳酸钙主要来自粒径>150μm的有孔虫壳体；水深接近或超过碳酸钙溶跃面的区域，碳酸钙主要来自粒径<25μm的细颗粒组分；25-38μm组分的显微特征及统计结果显示，表样沉积物中除了钙质超微化石和有孔虫壳体碎片，还首次鉴定出不同属种的钙质沟鞭藻，其占钙质生物比例最高可达73.68%。此外，海岭区碳酸钙含量变化还与陆源物质及硅质生物壳体的稀释作用密切相关。分粒级碳酸钙结合扫描电镜显微特征统计分析，不仅为揭示深海沉积物碳酸钙变化机制研究提供新方法，还可深化对海洋埋藏有机碳和溶解有机碳组成的理解，为全球海洋碳循环研究提供科学依据。

关键词： 90°E海岭; 表层沉积物; 碳酸钙组成; 分粒级碳酸钙

本文引用格式

杜恕环 , 向荣 , 苏翔 , 张兰兰 , 潘子锐 , 谢金沃 , 罗传秀 , 万随 . 东北印度洋90°E海岭表层沉积物碳酸钙组成与影响因子[J]. 热带海洋学报, 0 : 1 . DOI: 10.11978/2025001

Abstract

By studying the calcium carbonate composition and spatial distribution of surface sediments from the 90°E ridge and its adjacent waters in the northeast Indian Ocean, not only clarity the main sources of calcium carbonate in sediments from different water depths, but also reveal the influenced factors and variation mechanism of the calcium carbonate content of surface sediments in the northeast Indian Ocean. Based on the whole-sample calcium carbonate and its particle size calcium carbonate tests of 10 surface sediment samples, combined with the scanning electron microscope microscopic characteristics and quantitative statistical data, found that the calcium carbonate content of the Ridge Area varies between 36.95% -74.76%, with an average content of 56.05%, which can be classified into three grades of 30%-45%, 45%-60%, and 60%-75%, and that the influencing factors for the regional distribution of calcium carbonate have a diversity of factors. At stations with water depths above 3000 m, calcium carbonate mainly comes from foraminiferal shells with particle sizes >150 μm; in areas with water depths close to or exceeding the dissolution surface of calcium carbonate, calcium carbonate mainly comes from fine-grained fractions with particle sizes <25 μm; microscopic characterization of the 25-38 μm fractions and the statistical results show that, in addition to calcareous ultramafic fossils and fragments of foraminiferal shells in the surficial sediment, different genera of calcium carbonate were also identified for the first time, the proportion of calcareous organisms in the surface sediments reached 73.68%. In addition, the variation of calcium carbonate content in the ridge area is closely related to the dilution of land-based materials and siliciclastic shells. The method of statistical analysis of particle size calcium carbonate combined with scanning electron microscope microscopic features established in this study, not only provides a new method for revealing the mechanism of calcium carbonate changes in deep-sea sediments, but also deepens the understanding of the composition of buried and dissolved organic carbon in the ocean, providing a scientific basis for the study of the global ocean carbon cycle.

Key words： 90°E Ridge; surface sediments; calcium carbonate composition; particle size calcium carbonate

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