广西来宾栖霞组缺氧沉积环境地球化学特征

地层的岩石地球化学特征是判断其形成环境氧化还原条件的重要手段之一。本文对广西来宾铁桥剖面栖霞组中层纹状灰岩和含泥质灰岩进行地球化学分析 ,结合栖霞组沉积学和古生态学特征 ,对栖霞组沉积环境进行了探讨。岩石微量元素含量、黄铁矿矿化程度 (DOP值 )、痕量元素V/Cr、Ni/Co、U/Th、V/(V +Ni)等比值的研究结果显示 ,研究区具有缺氧沉积成因的地球化学特征。

GEOCHEMISTRY OF ANAEROBIC SEDIMENTARY ENVIRONMENTS OF THE QIXIA FORMATION IN LAIBIN, GUANGXI

The geochemistry of sediments and rocks in the anaerobic environments is commonly an important indicator for the interpretation of palaeo-redox conditions. The analyses of twenty eight moderately laminated limestone and argillaceous limestone samples collected from the Lower Permian Qixia Formation of the Laibin section, Guangxi, integrated with their sedimentary and palaeoecological characteristics, have confirmed that the carbonate successions in the study area were accumulated in an anaerobic environment. In addition, it is caused by seasonal thermocline in the bottom water.