贵州二叠纪—三叠纪古气候和古海洋环境的地球化学研究  

GEOCHEMISTRY OF PALEOCLIMATE AND PALEO-OCEAN ENVIRONMENT DURING PERMIAN-TRIASSIC IN GUIZHOU PROVINCE

作　　者：南君亚[1] 叶健骝[1] 王筑明[1] 周德全 

机构地区：[1]环境地球化学国家重点实验室中国科学院地球化学研究所,贵阳550002 [2]贵州地勘局区域地质调查研究院,贵阳550005

出　　处：《矿物学报》1998年第2期239-249,共11页Acta Mineralogica Sinica

基　　金：国家自然科学基金!49372113;IGCP386项目

摘　　要：通过对贵州二叠纪和三叠纪地层沉积岩相、古生物组合、稀土元素、碳氧同位素和微量元素地球化学综合研究，发现贵州二叠纪、早一中三叠世和晚三叠世三个地质时期古气候和古海洋环境有明显差别。其中二叠纪为潮湿的热带海洋性气候，海水相对氧化，盐度正常，平均温度为53℃；早一中三叠世为干燥的大陆性气候，海水相对还原，盐度较高，平均温度为38℃；晚三叠世又转变为潮湿的气候，海水相对氧化，盐度正常，平均温度为44℃。，结合泛大陆演化特征，讨论了造成气候变化的原因。Comprehensive studies on sedimentary lithofacies,paleobiological assemblage, REE geo-chemistry, carbon and oxygen isotopes, and trace elements of the Permian-Triassic strata inGuizhou suggest that the paleoclimate and paleo-ocean environment have obvious dlfferences be-tween Permian, Early-Middle Triassic,and Late Triassic in Guizhou.In the Permian it might be a moist tropical maritime climate with the seawater being charac-terized by relative oxidation, normal salinity and average temperature 53℃ In the Early-MiddleTriassic,however, it turned into an arid and scorning contlnental climate. The seawater might bereduced with relatively high salinity,and its average temperature is about 38℃ - In the Late Trias-sic,the climate was similar to that 1n the Permian and the average temperature of seawater was ap-proximately 44℃.Combined with the evolution of Pangea,the factors leading to climate changes are discussed.

关 键 词：古气候 古海洋环境 地球化学 二叠纪 三叠纪 贵州 

分 类 号：P532[天文地球—古生物学与地层学] P736.22[天文地球—地质学]