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长江口—杭州湾及其邻近海域不同粒级沉积有机碳分布特征

DOI: 10.11867/j.issn.1001-8166.2009.11.1202, PP. 1202-1209

Keywords: 沉积物,粒度敏感组分,有机碳,有机碳同位素

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Abstract:

通过对长江口、杭州湾、舟山海域及东海陆架4个海区表层沉积物样品的粒度敏感组分分析,发现东海陆架与长江口具有相似的三级组分物质组成,杭州湾与舟山海域具有相似的两级组分物质组成。综合4个区域粒级组分分布特征,采用湿分法将4个海域表层沉积物样品分成6个粒级0.250mm,分别提取各级组分和全样进行有机碳及同位素测试。定量分析各级组分有机碳含量、来源及物质组分,除杭州湾海域粗粒级外,基本上<0.004mm的粘土组分有机碳含量最高;富集在杭州湾海域粗颗粒中的有机质主要来源于陆源植物碎屑。沉积物颗粒大小、物质组成类型是不同粒级有机质富集的主要控制因素。

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