湖北建始黄岩及邻区二叠系大隆组生态地层  

ECOSTRATIGRAPHY OF THE PERMIAN DALONG FORMATION IN THE HUANGYAN AND ADJACENT AREA,JIANSHI,HUBEI

作　　者：陈立德[1] 

机构地区：[1]宜昌地质矿产研究所,湖北宜昌443003

出　　处：《地层学杂志》2009年第4期432-440,共9页Journal of Stratigraphy

基　　金：中国地质调查局1/5万<巫山县幅>;<官渡河幅>区域地质调查项目成果

摘　　要：湖北建始黄岩及邻区二叠系大隆相区产丰富的菊石、双壳类、鱼类以及少量的壳薄体轻的腕足类和遗迹化石等底栖生物。根据建始黄岩和巫山纸厂沟剖面上化石的埋葬特征,以化石的形态功能分析为基础,将建始黄岩、巫山纸厂沟二叠纪大隆组—大冶组底部的生物群分为9个群落,根据群落对沉积盆地中游离氧的示踪,将区内群落划分为浮游微生物群落、游泳漂浮群落、底栖表生群落和底栖内生群落四种类型。在群落生态分析及群落带划分的基础上,分析了建始黄岩及邻区群落的时空分布及古地理演变特点。The Dalong Formation in the Huangyan and adjacent area contains abundant ammonites, bivalves, sharks, a small quantity of thin-shelled and light brachiopods,and rare trace fossils. According to the characteristic of the fossils from Huangyan （Hubei） and Zhichanggou （Chongqing）, on the basis of functional morphology analysis, 9 fossil assemblages were recognized in the Dalong Formation and the lower Daye Formation, reflecting varying redox conditions of the bottom water in the basin. Building upon these paleontological data, four community types were identified, including the planktonic-nannoplantonic community, nektonic-planktonic community, epifaunal community, and infaunal community. On the basis of community ecology, spatial and temporal distribution of different communities and the paleogeographic evolution of the Huangyan and adjacent area are discussed.

关 键 词：生态地层 群落类型 含氧量 大隆组 二叠系 建始 湖北 

分 类 号：P534.16[天文地球—古生物学与地层学]