南黄海中部海底沉积物饱和烃地球化学特征及物源判识

Hydrocarbon Geochemical Characteristics and Identification of Seabed Sediment Sources in the Middle of South Yellow Sea

通过对南黄海中部海底表层沉积物饱和烃及生物标志物测试分析,研究了沉积物饱和烃及生物标志物的分子地球化学特征,进行了物源判识。结果显示,研究区表层沉积物正构烷烃系列有3种碳数分布模式:后峰型、双峰型和中间型。各地化指标说明沉积中有机质是混源输入的结果,以陆源高等植物贡献为主。沉积有机质是在海相缺氧的还原条件下沉积的。甾、萜烷中地质构型的化合物丰度高,反映了有机质低熟-成熟特征,推测研究区海底表层沉积物中有机质受人文活动或工业污染的可能性较小。

The seabed surface sediment samples collected in the middle part of the South Yellow Sea were analyzed based on biomarker detected by molecular organic geochemical methods to determine the composition,distribution and origin of organic matters.There were three n-alkane distribution patterns in the study area: back distribution,bimodal distribution and middle distribution.Based on the value of every indexes indicate that a higher proportion of terrestrial particulate organic matter is deposited.The organic matter deposited in reducing environments.The biomarkers of terpane and sterane show that the organic matter are from low mature to mature.All of these demonstrate that there is no possible of human and industrial pollution.