贵州平塘县甘寨二叠纪剖面生物地层研究及年代地层界线讨论  

BIOSTRATIGRAPHY AND CHRONOSTRATIGRAPHIC BOUNDARIES OF THE PERMIAN AT THE GANZHAI SECTION,PINGTANG,GUIZHOU PROVINCE

作　　者：常晓琳[1] 石和[2] 李奎[1] 胡芳[1] 

机构地区：[1]成都理工大学博物馆,成都610059 [2]成都理工大学沉积地质研究院,成都610059

出　　处：《微体古生物学报》2012年第4期391-401,共11页Acta Micropalaeontologica Sinica

摘　　要：本文利用多重地层划分方法对贵州平塘县甘寨剖面的岩石地层单位进行了清理,将剖面中的二叠系由下至上划分为马平组、梁山组、栖霞组、茅口组、合山组和大隆组。剖面的二叠纪化石丰富,笔者根据获得的类化石27属60种在地层中的分布特征,将剖面从下至上划分出9个类化石带,并在将它们与邻区及国际上相应的化石带对比的基础上探讨了本剖面的年代地层划分。本文采用了国际上的二叠系三分法,将二叠系自下而上划分为3统8阶,证实了马平组为一穿时岩石地层单位,跨越上石炭统—下二叠统;茅口组也存在一定程度上的穿时现象,推测本剖面可能缺失隆林期的地层。同时还根据在剖面的顶部获得一些牙形刺及菊石化石讨论了剖面的P/T界线。This study revises the lithostratigraphic units from Ganzhai Section, Pingtang County, Guizhou Province and subdivides the Permian of this section into 6 formations from bottom up according to the results of regionally lithostratigraphic liquidation as： Maping Fm. , Liangshan Fm. , Qixia Fm. , Maokou Fro. , Heshan Fm. and Dalong Fm. Unusually diverse fossil assemblages of Permian from Ganzhai section, and 60 fusulinacean species belonging to 17 genera are found from this section, nine fusulinid zones have been recognized according to the changes of components of the fusulinid. Chronostratigraphic subdivision of this section is discussed by comparing these fossil zones with the contemporary ones from adjacent area and other places in the world, using 8 stages belonging to 3 Series of the Permian. On the international geological time scale it is proved that the Maping Fm. is a diachronous unit which be- longs to the Upper Carboniferous--Lower Permian. The Maokou Fro. is also diachronic, and this section is conjec- tured to lack the strata of the Longlinian Stage according to the output of fusulinid fossils. We also discuss the P/T boundary according to the conodont and ammonite fossils from the top of the section.

关 键 词：有孔虫 牙形刺 生物地层 年代地层界线 二叠纪 平塘县 贵州 

分 类 号：Q911[天文地球—古生物学与地层学]