晋东南上石炭统—下二叠统太原组灰岩中遗迹组合及其沉积环境  

Ichnoassemblages and their sedimentary environments in limestone of the Upper Carboniferous-Lower Permian Taiyuan Formation,southeastern Shanxi Province

作　　者：胡斌[1,2] 胡磊[1] 宋慧波[1] 杨连超[1] 

机构地区：[1]河南理工大学资源环境学院,河南焦作454003 [2]河南省生物遗迹与成矿过程重点实验室,河南焦作454003

出　　处：《古地理学报》2013年第6期809-818,共10页Journal of Palaeogeography：Chinese Edition

基　　金：国家自然科学基金项目(编号:41102002;41272117);国家高校博士点专项基金项目(编号:20094116110002)联合资助

摘　　要：晋东南陵川地区上石炭统—下二叠统太原组灰岩中遗迹化石发育,已识别出10个遗迹属14个遗迹种,常见遗迹化石包括Zoophycos,Helminthopsis,Planolites,Nereites,Chondrites,Thalassinoides,Rhizocorallium,Ophiomorpha,Palaeophycus和Teichichnus等,其中Zoophycos最为发育。依据遗迹化石的组成、分布及产状特征,可建立4个遗迹组合:(1)Zoophycos-Thalassinoides遗迹组合;(2)Planolites-Helminthopsis遗迹组合;(3)Zoophycos-Teichichnus遗迹组合;(4)Nereites-Chondrites遗迹组合。对这些遗迹化石宿主岩石沉积特征的分析表明,太原组灰岩中的遗迹组合分别产生于海湾—潟湖环境(遗迹组合1)、浅海上部(遗迹组合2)、浅海中部(遗迹组合3)和浅海下部(遗迹组合4)。基于遗迹组合特征和沉积特征的综合分析,提出了研究区太原组遗迹化石组合的沉积环境模式,这一成果可为今后该区太原组中煤与煤层气生成的古环境研究提供生物学信息和基础理论资料。The abundant ichnofossils were found in the Upper Carboniferous-Lower Permian Taiyuan Formation of Lingchuan area, southeastern Shanxi Province, in which 10 ichnogenus and 14 ichnospecies were distinguished. Common ichnofossils include Zoophycos , Helminthopsis , Planolites , Nereites , Chon- drites, Thalassinoides, Rhizocorallium, Ophiomorpha, Palaeophycus and Teichichnus, and the most common ichnofossil is Zoophycos. According to the composition, distribution and occurrence characteris-tics of ichnofossils, four ichnoassemblages were recognized： （1） Zoophycos-Thalassinoides ichnoassem- blage ; （2） Planolites-Helminthopsis ichnoassemblage ; （3） Zoophycos-Teichichnus ichnoassemblage ; （4） Nereites-Chondrites ichnoassemblage. By the analysis of sedimentary characteristics of the host rock of these ichnofossils, it is showed that these ichnoassemblages in the limestone of the Taiyuan Formation mainly dis- tributed respectively in embayment-lagoon （ichnoassemblage 1）, the upper shallow sea （ichnoassemblage 2）, the middle shallow sea （ichnoassemblage 3） and the lower shallow sea （ichnoassemblage 4）. Based on the synthesis analysis of the ichnoassemblages and sedimentary characteristics, this paper puts forward the sedimentary environmental model of ichnoassemblages in the Taiyuan Formation of Lingchuan area. The result will provide the biologic information and basic data for the study of coal and coalbed gas formation palaeoenvironment in the Taiyuan Formation of southeastern Shanxi Province in the future.

关 键 词：遗迹组合 沉积环境 太原组 沁水盆地 

分 类 号：Q911.28[天文地球—古生物学与地层学]