南沙群岛海区现代海洋沉积物的芳烃地球化学特征  

Aromatic Hydrocarbon Geochemical Features in Modern Sediments from the Nansha Islands Sea Area

作　　者：李原[1] 周世新[2] 曾凡刚[3] 罗斌杰[2] 李智明[4] 

机构地区：[1]中国科学院地质研究所,北京100029 [2]中国科学院兰州地质研究所,兰州730000 [3]北京大学地质系,北京100083 [4]中共兰州市委党校,兰州730000

出　　处：《沉积学报》1997年第A12期30-34,共5页Acta Sedimentologica Sinica

摘　　要：南沙群岛海区第四纪沉积物的芳烃地球化学研究表明,NS90-109和NS90-103沉积物有丰富的芳烃种类,位于礁区上陆坡的NS90-109样品的芳烃相对丰度较高。低分子量的芳烃化合物含量很低,如萘系化合物低于检测限,与未被污染现代海洋沉积物的芳烃分布特征一致。芳烃各种热演化参数值较低、多环芳烃的烷基化程度较低,而古代沉积物成熟度较高,反映了有机质初期演化阶段的特征。NS90-109样品的甲基硫芴分布特征,明显不同于湖沼相和咸水—盐湖相。NS90-109现代海洋沉积物的三芴分布特征与其它环境不同,应属于未被污染的现代海洋沉积物,属于有机质演化的初期阶段,母质来源于海洋生物的多环芳烃前身物以及陆生植物自然大火燃烧物,后者经过风的长距离搬运。The aromatic hydrocarbon geochemical study for Quaternary sediments from the Nansha Islands Sea Area shows that there are a variety of aromatics types for NS90 - 109 and NS90 - 103 samples,and the relative abundances of aromatics for the NS90 - 109 sample are higher,while both samples have lower maturity levels and alkylation intensity,indicating non - pollution marine sediment features.The three - fluorene and methyl - dibenzothiophanes' distribution of NS90 - 109 is different from swamp - lake and lacustrine environments,reflecting modern oceanic sediments' characters.The orgnic matter of NS90 - 109 is in the initial peroid of the early diagenesis evolution with ocean biological PAHs' precursors or pyrolysis porducts carried from terriestial plant fire wind.

关 键 词：南沙群岛海区 现代沉积物 芳烃化合物 地球化学 

分 类 号：P736.41[天文地球—海洋地质]