盘县-罗平动物群--中三叠世初期生物复苏、辐射的标志性生物群  

THE PANXIAN AND LUOPING FAUNAS:IMPLICATIONS FOR THE TRIASSIC RECOVERY FROM END-PERMAIN MASS EXTINCTION

作　　者：尹超[1] 郝维城[1] 季承[2,3] 江大勇[1,2] 孙作玉[1] 

机构地区：[1]北京大学地质系与地质博物馆,北京100871 [2]现代古生物学和地层学国家重点实验室中国科学院南京地质古生物研究所,江苏南京210008 [3]资源地层学与古地理学重点实验室中国科学院南京地质古生物研究所,江苏南京210008

出　　处：《地层学杂志》2014年第3期328-335,共8页Journal of Stratigraphy

基　　金：国家自然科学基金国际合作重大项目(No.40920124002);国家自然科学基金(No.40672002,40302009);现代古生物学和地层学国家重点实验室(南京地质古生物研究所)开放基金(123102)资助

摘　　要：中国贵州、云南地区发现的盘县动物群和罗平动物群中保存了数量丰富、完整精美且具有较高分异度的海生脊椎动物化石并伴生多门类无脊椎动物化石,是二叠纪末期生物大灭绝后,生物圈复苏和生态系统重建过程中进入快速和全面辐射时期的标志。对这两个动物群的时代、地理、地层与生物组成等方面进行了详细对比后发现,盘县动物群与罗平动物群均产自中三叠统关岭组上段,且同处于牙形石Nicoraella kockeli带,时代均为中三叠世安尼期Pelsonian亚期早期,但同名带内牙形石面貌、地层分布特征及形态演化等存在差异。盘县动物群与罗平动物群中的海生爬行类的多样性组成在科级别的分类单位上比较相似,但在属级别的分异度上略有差异,盘县动物群的组成分子比罗平动物群更加原始,且具有一些后者没有的较原始的形态类型。罗平动物群中的鱼类和节肢类的丰度和分异度均显著高于盘县动物群,从这点来看,罗平动物群的环境中有机质更加丰富,生态系统更加完善,反映其陆源补给更加充足,与盘县动物群相比可能离岸更近。The Panxian Fauna from Guizhou and Luoping Fauna from Yunnan yield abundant,complete and high diversity marine vertebrate fossils associated with invertebrate fossils,which represents the biological recovery following the Permo-Triassic extinction.The two faunas are compared in terms of their spatial and distribution,stratigraphy,and taxonomic composition.The Panxian and Luoping faunas are both preserved in the Upper Member of the Guanling Formation,belonging to the conodont Nicoraella kockeli Zone of the early Pelsonian age.However,there are differences in the conodont diversity,stratigraphic distribution,and morphological evolution between the two faunas.The diversity of the marine reptile of the two faunas is similar at the family level,but slightly different at the genus level.The Panxian Fauna consists of more primitive marine reptiles that do not occur in the Luoping Fauna.The abundance and disparity of the fish and arthropods in the Luoping Fauna are significantly higher than in the Panxian Fauna.Compared with the Panxian Fauna,the Luoping Fauna may have lived in a coastal environment with graeter nutrient supplies.

关 键 词：生物地层 海生爬行动物 盘县动物群 罗平动物群 中三叠世 贵州 云南 

分 类 号：P534.51[天文地球—古生物学与地层学]