孟加拉湾中部表层沉积物有机碳分布特征及来源
发布时间：2019-05-15 12:18
【摘要】：通过对孟加拉湾中部110个表层沉积物样品有机碳、氮含量及粒度进行测试分析,揭示了研究区表层沉积物平均粒径、有机碳(TOC)、总氮(TN)、有机碳/总氮(TOC/TN)的分布特征,并讨论了其有机质来源及控制因素。结果表明,研究区表层沉积物的平均粒径值为6.2~7.6Φ,平均为7.1Φ,其分布呈现出以16°N和15°N为界南北两侧海域粒度相对较细(7Φ),中间海域相对较粗(7Φ)的特点;研究区TOC的质量分数为0.37%~1.24%,平均为0.84%,TN质量分数为0.05%~0.15%,平均为0.10%,两者分布特点相似,大致以15°N和16°N为界表现出南北两侧海域高,中间海域低的特点;TOC/TN比值为6.05~12.88,平均为8.38,中部海域比值高,南北两侧低。根据TOC/TN比值估算研究区陆源和海洋自生有机质的贡献,结果表明研究区陆源与海洋自生有机质平均相对贡献分别为60%和40%。研究区有机质的分布主要受控于有机质来源及输运方式,其中浊流输运导致的溢流沉积是其最主要的控制因素。另外,粒度、河流悬浮体的输入沉降和有机质保存条件等因素也起着重要作用。
[Abstract]:Based on the measurement and analysis of organic carbon, nitrogen content and particle size of 110 surface sediment samples in the central Bay of Bengal, the average particle size of surface sediments and the total nitrogen (TN), of organic carbon (TOC), in the study area were revealed. The distribution characteristics of organic carbon / total nitrogen (TOC/TN) were discussed, and the source and control factors of organic matter were discussed. The results show that the average grain size of the surface sediments in the study area is 6.2 鈮，
本文编号：2477501
[Abstract]:Based on the measurement and analysis of organic carbon, nitrogen content and particle size of 110 surface sediment samples in the central Bay of Bengal, the average particle size of surface sediments and the total nitrogen (TN), of organic carbon (TOC), in the study area were revealed. The distribution characteristics of organic carbon / total nitrogen (TOC/TN) were discussed, and the source and control factors of organic matter were discussed. The results show that the average grain size of the surface sediments in the study area is 6.2 鈮，
本文编号：2477501
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