【作者】 黄明立； 田坤烜； 史宇坤；

【机构】 南京大学生物演化与环境科教融合中心；

【摘要】 亚丁斯克期华南滇黔桂地区沉积环境分异明显,主要发育局限或半局限海台地沉积区、开阔海台地沉积区和台地边缘沉积区,不同沉积区?有孔虫动物群面貌也有所区别。作者详细研究了黔南地区的猴场打望剖面和惠水竹子冲剖面阿瑟尔期-亚丁斯克期的地层,在打望剖面识别出4个?类化石带,由老至新为Pseudoschwagerina beedei—Sphaeroschwagerina constans共存延限带、Staffella xiushuiensis—Eoparafusulina contracta富集带、Pseudofusulina ellipsoidalis富集带和Misellina subcycloidea间隔带。竹子冲剖面识别出3个化石带,由老至新为Pseudoschwagerina uddeni—Sphaeroschwagerina sphaerica组合带、Eoparafusulina certa富集带和Staffella discoides延限带。对滇黔桂地区不同沉积相区剖面沉积的综合研究显示:开阔海台地或台地边缘环境的?动物群以Pamirina为特征分子,同时还产出丰富的希瓦格?亚科(Schwagerininae)分子;局限或半局限海台地环境的?类以史塔夫?亚科分子(Staffellininae)为主。更多还原

【Abstract】 During Artinskian age of Early Permian, marine environment around the junction of Yunnan, Guizhou and Guangxi provinces, so called Dianqiangui Basin, in South China were diverse. Restricted or semi-restricted marine lagoon, open and marginal marine platforms have been recognized, within distinctively evolved fusulinids. Two geological sections, Dawang Section and Zhuzichong Section, located in southern Guizhou, were studied in detail and described here for their Asselian to Artinskian strata. Four fusulinid biostratigraphic zones, Pseudoschwagerina beedei—Sphaeroschwagerina constans concurrent range zone, Staffella xiushuiensis—Eoparafusulina contracta abundance zone, Pseudofusulina ellipsoidalis abundance zone and Misellina subcycloidea interval zone, have been recognized upwards in Dawang Section. Three fusulinid zones, Pseudoschwagerina uddeni—Sphaeroschwagerina sphaerica assemblage zone, Eoparafusulina certa abundance zone and Staffella discoides range zone, were defined upwards in Zhuzichong Section. An extended section study covering different types of marine environment in the Dianqiangui Basin showed that Pamirina was the typical genus in the open and marginal marine platform along with thrived schwagerininids, while staffellininids developed abundantly in the restricted or semi-restricted environment.更多还原