摘要
在草海盆地和柴窝堡湖沉积物中分析鉴定出十几种甾醇、甾二烯醇和甾烷醇等。草海盆地生物输入以陆生高等植物为主,柴窝堡湖以浮游动、植物为主。对比二者甾醇类分布,表明高等植物贡献较多的 C_(29)甾醇,浮游生物、尤其是浮游动物贡献较多的 C_(27)甾醇和其他甾二烯醇等多种化合物;还原条件有利于甾醇转化为甾烷醇,它们在早期成岩作用阶段易于脱水产生甾烯。
In order to understand the distribution characteristics of biomarkers in source rocks,whichmay be related to organic input,Quaternary sediments from the Caohai Basin and the Chai-wobu Lake were analyzed for sterols.As a result,various sterols have been found in the sedi-ments.The composition of sterols in the sediments reveals that cholesterols and cholestedienolsare more abundant than their C_(29) counterparts in the Chaiwobu Lake sediments and that C_(29) ste-rols are more abundant in the peats from the Caohai Basin.It is also found that starol/sterolratios in clays are higher than in peats.Studies show that organic input to the Chaiwobu Lake is mainly plankton and zooplanktonand to the Caohai Basin is mainly terrestrial high plant.The authors have proposed that therelative abundance of C_(27) or C_(29) sterane in source rocks may reflect input characteristics to someextent and the staral/sterol ratios may reflect the redox conditions of the depositional environ-ments.
出处
《地球化学》
CAS
CSCD
北大核心
1993年第2期179-186,共8页
Geochimica
基金
国家自然科学基金
