塔里木盆地下古生界生物标志物分布与沉积环境的关系

塔里木盆地下古生界生物标志物分布与沉积环境有关,反映了藻类和微生物输入的特征。寒武系和奥陶系生物标志物分布具有异同点。塔里木盆地奥陶系与全球奥陶系生物标志物分布的差异反映了不同的生物输入。

RELATION OF LOWER PALEOZOIC BIOMARKER DISTRIBUTION TO SEDIMENTARY ENVIRONMENT IN TARIM BASIN

Lower Paleozoic marine sedimentary rocks in Tarim Basin are characterized by the distribution of biomarkers coming from algae and bacteria, including the distribution of lower carbon number n-alkanes with even carbon predominances or odd carbon predominances and the distribution of lower carbon number alkyl cycloalkanes with even carbon predominances. Gammacerane,,aarotanes, pristane and phytane are widespread, and the contents of rearrange steranes are lower than that of regular steranes, but the contents of tricyclic terpanes are higher. Cambrian sedimentary rocks with besin marginal facies are different from Ordovician Sedimentary rocks with open platform and half-deep water shelf facies in the distribution of biomarkers. The contont of C₂₇ sterane increases from Cambrian to Ordovician. Ordovician sedimentary rocks in Tarim Basin are different from those of shallow water shelf facies in North American in the distribution of biomarkers. The later have no pristane and phytane, containing lower carbon number n-alkanes with odd carbon predominances and lower carbon number a1kyl cycloalkanes with odd carbon predominances,and are characetrized by higher content of C₂₉ sterane, the content of rearrange steranes is equal to the content of regular steranes.