孟加拉灣中部表層沉積物有機碳分布特征及來源
發(fā)布時間:2019-05-15 12:18
【摘要】:通過對孟加拉灣中部110個表層沉積物樣品有機碳、氮含量及粒度進行測試分析,揭示了研究區(qū)表層沉積物平均粒徑、有機碳(TOC)、總氮(TN)、有機碳/總氮(TOC/TN)的分布特征,并討論了其有機質來源及控制因素。結果表明,研究區(qū)表層沉積物的平均粒徑值為6.2~7.6Φ,平均為7.1Φ,其分布呈現(xiàn)出以16°N和15°N為界南北兩側海域粒度相對較細(7Φ),中間海域相對較粗(7Φ)的特點;研究區(qū)TOC的質量分數為0.37%~1.24%,平均為0.84%,TN質量分數為0.05%~0.15%,平均為0.10%,兩者分布特點相似,大致以15°N和16°N為界表現(xiàn)出南北兩側海域高,中間海域低的特點;TOC/TN比值為6.05~12.88,平均為8.38,中部海域比值高,南北兩側低。根據TOC/TN比值估算研究區(qū)陸源和海洋自生有機質的貢獻,結果表明研究區(qū)陸源與海洋自生有機質平均相對貢獻分別為60%和40%。研究區(qū)有機質的分布主要受控于有機質來源及輸運方式,其中濁流輸運導致的溢流沉積是其最主要的控制因素。另外,粒度、河流懸浮體的輸入沉降和有機質保存條件等因素也起著重要作用。
[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,
本文編號: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,
本文編號:2477501
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