摘要:
作者从中国南海北部湾海洋柱状(0—465cm)沉积物中,分离和鉴定出10种甾醇有机物,其中C27、C28甾醇是海洋浮游动物和硅藻红藻等的生态示踪剂,C29甾醇是陆源高等植物输入海洋的信息.研究结果表明,C27、C28和C29甾烷醇和甾烯醇的比值,随着柱状沉积物的深度增加而逐渐增大,反映了甾醇在早期成岩作用中的演化特征。
关键词:
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甾烯醇 /
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甾烷醇 /
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甾醇 /
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生态示踪剂
Abstract:
The distribution of stenols and stanols were examined in leg 4-60-65(0-465cm)of marine sediment core from Beibuwan gulf of South China sea.Ten sterols named as Cholest-5-en-3β-o1; 5x-Cholest-3β-ol; 24-MethylchoIest-5, 22-di-en-3β-ol; 24-Methyl-5x-cholest-22-en-3β-ol; 24-Methylene cholest-5-en-3β-ol: 24-Methyl-5x-cholest-3β-ol; 23, 24-di-methy-lcholest-5, 22-di-en-3β-ol; 23, 24-Dimethyl-5x-cholest-22-en-3β-ol; 24-Ethylcholest-5-en-3β-ol; 24-Ethyl-5α-cholest-3β-ol have been identified by means of gas chromatography-mass spectromatry-data system. A high concentration of C27 sterols were mainly originated from zooplankton lipids. the C28 sterols were derived from diatom, the C27-C29 sterols were observed in various species of green and red algae, the C29 24-Ethylcholest-5-en-3β-ol as a biomarker is thought to indicate input of terrigeous organic matter, the C27-C29 sterols as a ecological indicator to recognize the source of organic matter in marine. These sterols are mainly come from zooplankton in marine environment. The results show that the C27 C28 and C29 5x-stanol/△5 stenol ratio increase with sediment depth, that means the evolution of sterols occur in the reducing environment of deeper marine sediments from Beibuwan gulf of South China Sea.