摘要
在研究羊毛甾烷的基础上，又从泌阳凹陷第三系湖相泥质白云岩地层中检测出了其他系列的特殊甾烷化合物，如３β－乙基甾烷（Ｃ（２９）－Ｃ（３１）），３β－正丙基甾烷（Ｃ（３０）－Ｃ（３２））和３β－丁基甾烷（Ｃ（３１）－Ｃ（３３））和甲藻甾烷等。这些特殊甾烷集中出现的情况曾未报道过。除母源输入具有特殊组合外，水体较高盐度和强还原环境可能是这些化合物得以保存的重要原因。
The 3-ethyl steranes (C29-C31), 3-n-propyl steranes (C30-C32) and 3-butyl steranes (C31-C33) were identified in the clayey dolomite formation of Biyang Depression.Lano steranes (C30-C32) and abundant regular steranes (C27-C29) and 4-methyl steranes (mainly dinostane) were found in the same samples. This is a rare case that so many kinds of steranes occur together. It was also recognized that these non-ordinary steranes varies in Pr/Ph ratio and gammacerane content, and are controlled by the water salinity and oxidation/reduction condition of depositional environment. The hopane/sterane ratio has no relationship to their relative content.There is no evidence that the 3-alkylated steranes are of biological origin.
出处
《地球化学》
CSCD
北大核心
1995年第4期379-386,共8页
Geochimica
关键词
生物标志物
甾烷
泥质白云岩
沉积环境
地球化学
biomarker
sterane
clayey dolomite
depositional environment
organic matter input
