云南建水官厅地区晚泥盆世法门期牙形石带的发现及五指山组的厘定意义  

THE DISCOVERY OF LATE D FAMEN STAGE CONODONT ZONE AND SIGNIFICANCE OF WUZHISHAN FORMATION DETERMINATION OF GUANTING AREA IN JIANSHUI,YUNNAN

作　　者：赵云江 包佳凤 彭成龙 王晓林 ZHAO Yun-jiang;BAO Jia-feng;PENG Cheng-long;WANG Xiao-lin(Yunnan Institute of Geological Survey,Kunming 650216)

机构地区：[1]云南省地质调查院,昆明650216 [2]贵州省地质调查院,贵阳550081

出　　处：《云南地质》2022年第1期1-8,共8页Yunnan Geology

基　　金：中国地质调查局,云南区域地质调查片区总结与服务产品开发(NO.121201102000150012-02)。

摘　　要：官厅地区以南红河北岸前人划分石炭系无古生物依据,对比为扬子地层区石炭系黄龙组。根据官厅地区石炭系泥晶灰岩中采获晚泥盆世法门期牙形石Palmatolepis rhomboids带,结合其夹基性火山岩及硅质岩、硅质条带灰岩等特征,将其厘定为泥盆系上统五指山组。Palmatolepis rhomboids带在滇东南地区晚泥盆世地层中属首次发现,也是东南地层区广西境内五指山组的同名牙形石带。其岩石地层、生物地层、沉积环境可与广西上泥盆统“南丹(海槽)型”五指山组对比,具相同构造背景。因此,将其划归东南地层区右江地层分区,解决了官厅地区前人划分石炭系分区归属、年代及沉积环境三个重大地质问题,对划分右江地层分区与扬子地层区上扬子地层分区(黔西南地层分区)界线具有重要的地质意义。The C setup by the predecessors on Honghe river N bank south of Guanting area is without the palaeontological confirmation,which was in comparison to C Huanglong Formation of Yangtze stratigraphical area.According to late D Famen stage conodont Palmatolepis rhomboids zone collected in C argillo-crystalline limestone of Guanting area,and in combination with its intercalation of basic volcanic rock,siliceous rock and siliceous band limestone,etc characteristics,it is determined as Upper D Wuzhishan Formation.Palmatolepis rhomboids zone is discovered first in late D strata of SE Yunnan,which is also the same name conodont zone of Wuzhishan Formation in Guangxi of SE stratigraphic area.The lithostratigraphic,biostratigraphic and sedimentation environment can be correlated with Upper D“Nandan(marine geosyncline)“Wuzhishan Formation,with the same tectonic background.Therefore,it is divided into SE stratigraphic area Youjiang stratigraphic sub-area,solve predecessors'Guanting area divided into C stratigraphic sub-area,age and sedimentation environment 3 important geological problems,which is significant in dividing Youjiang Stratigraphic sub-area and Yangtze stratigraphic area Upper Yangtze stratigraphic sub-area(SW Guizhou stratigraphic sub-area)boundary.

关 键 词：牙形石Palmatolepis rhomboids带 晚泥盆世 五指山组 南丹型 云南建水 

分 类 号：P534.44[天文地球—古生物学与地层学]