| 摘要: |
| 对1990年取自南沙海域102站位岩芯柱样中饱和烃进行色谱－质谱分析，研究沉积物中生物标志化合物组成和地球化学意义。结果表明，正构烷烃、类异成二烯烷烃、甾烷和藿烷组成特征指示了其先质主要为海洋浮游生物和细菌，部分为陆源高等植物，反映了南沙海洋沉积有机质起源于这些生物；较丰富的胡萝卜烷存在和Pr／Ph比值低，说明沉积环境具强还原性；随沉积物理藏深度增加，藿烯和藿烷以及藿烷异构体之间，均存在明显的成岩转化关系。 |
| 关键词: 南沙海洋沉积物 生物标志化合物 生物源 沉积环境 成岩变化 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金资助项目，48970119号;中国科学院南沙综合考察项目：85-927-02-02 |
附件 |
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| COMPOSITION AND GEOCHEMICAL SIGNIFICANCE OF BIOMARKERS IN MARINE SEDIMENTS FROM NANSHA ISLANDS WATERS, THE SOUTH CHINA SEA |
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Duan Yi1, Luo Binjie1, Xu Yanqian2, Ma Lanhua3
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1.Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000;2.Research Institute of Petroleum and Development of Changqing Oilfield,Qingyang 745101;3.Earthquake Research Institute of Lanzhou, SSB, Lanzhou 730000
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| Abstract: |
| The saturated hydrocarbon in core samples collected from Leg NS90-102 (12° 02’N, 111° 00’E) From Nansha islands waters, the South China Sea in 1990 were analysed by GC-MS. Composition and distribution of biomarker compounds in the samples were studied. As a result, compositional characteristics of n-alkanes, isoprenoid alkanes, steranes and hopanes indicate that they come from marine planktons and bacteria as well as small amounts of land-higher plants, which reflect that the sedimentary organic matter From Nansha islands waters, the South China Sea is derived from these organisms. The existence of more abundant carotanes and lower Pr/Ph ratios show that depositional environment is anoxic. With increasing burial depth, the relationship of diagenetic transformation between hopenes and hopanes and those between hopane isomers are found. |
| Key words: Nansha islands waters sediments, Biomarker compounds, Biological source Sedimentary environment, Diagenetic evolution |
