四川盆地南缘的二叠系及生物群  

THE PERMIAN AND ITS BIOTA IN THE SOUTHERN MARGIN OF THE SICHUAN BASIN

作　　者：罗冰 张玺华 陈延贵 袁东勋 王向东 史宇坤[3] 马鑫怡 王文琦 侯章帅 陈吉涛 沈树忠 LUO Bing;ZHANG Xi Hua;CHEN Yan Gui;YUAN Dong Xun;WANG Xiang Dong;SHI Yu Kun;MA Xin Yi;WANG Wen Qi;HOU Zhang Shuai;CHEN Ji Tao;SHEN Shu Zhong(Exploration and Development Research Institute,PetroChina Southwest Oil&Gasfield Company,Chengdu 610041;School of Resources and Geosciences,China University of Mining and Technology,Xuzhou 221116;Frontiers Science Center for Critical Material Cycling,School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023;Key Laboratory of Palaeobiology and Petroleum Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008)

机构地区：[1]中国石油西南油气田公司勘探开发研究院,四川成都610041 [2]中国矿业大学资源与地球科学学院,江苏徐州221116 [3]南京大学地球科学与工程学院,关键地球物质循环前沿科学中心,江苏南京210023 [4]中国科学院南京地质古生物研究所,古生物学与油气地层应用重点实验室,江苏南京210008

出　　处：《地层学杂志》2024年第3期318-328,共11页Journal of Stratigraphy

摘　　要：四川盆地的二叠系是油气勘探的重要目的层,有必要对盆地内的二叠系开展更加精细的划分和对比研究。四川盆地南缘的二叠系缺乏详细的生物地层和年代地层研究,本文选取最具代表性的四川古蔺三道水剖面,开展岩石地层和生物地层研究。剖面下部199 m的地层主要为中层至厚层状的灰岩和泥质灰岩,归为栖霞组,可见多层以炉渣状灰岩为特征的古风化壳,反映了浅水碳酸盐台地沉积环境并伴随多次暴露,主要产?类化石及少量牙形类化石。?类可识别出下部的Nankinella顶峰带和上部的Pseudodoliolinaoliviformis-Chusenellachoshiensis组合带,而牙形类归为Pseudosweetognathus带,指示时代为早二叠世空谷期。剖面上部,即199~296m的地层,主要为薄层至中层状微晶灰岩,归为茅口组,含硅质结核和硅质条带,反映了较深水的沉积环境,未见?类化石,牙形类可归为3个化石带,从下到上为Jinogondolella sp. 1带、J. postserrata带和J. shannoni带,指示时代为中二叠世。The Permian is an important target for oil and gas exploration in the Sichuan Basin.It is needed to carry out research in more detail of subdivision and correlation on the Permian succession in the basin.However,it is still lack of detailed bio-and chronostratigraphic research on the Permian in the southern margin of the Sichuan Basin.We selected the most representative Sandaoshui section in Gulin County,Sichuan,from which both litho-and biostratigraphic frameworks were established.The lower part(1.5−199 m)of the section is mainly composed of medium-to thick-bedded limestone and argillaceous limestone and we grouped them as the Chihsia Formation that contains several subaerial exposures and paleo-karst deposits such as slag-like limestones,reflecting shallow to very shallow-water platform depositional environment with multiple exposures.The lower part of the section yields fusulines and could be grouped into two zones:the lower Nankinella Zone and the upper Pseudodoliolina oliviformis–Chusenella choshiensis Assemblage,while a few conodonts contained could be ascribed into the Pseudosweetognathus Zone,indicating the Kungurian of Early Permian in age.The upper part(199−296 m)of the Sandaoshui section is thinto medium-bedded limestone and could be grouped as the Maokou Formation containing abundant chert nodules and bands,reflecting relatively deep-water environment.No fusulines were found but conodonts only that could be grouped into three biozones:the Jinogondolella sp.1 Zone,the Jinogondolella postserrata Zone,and the Jinogondolella shannoni Zone in ascending order,indicating the Middle Permian in age.

关 键 词：四川盆地南缘 二叠系 ?类 牙形类 古蔺三道水剖面 

分 类 号：P534.46[天文地球—古生物学与地层学]