| 豫西北太原组的时代:来自类化石的证据 |
| |
| 作者单位： | ;1.河南理工大学资源环境学院;2.中国地质大学生物地质与环境地质国家重点实验室 |
| |
| 摘 要： | 在河南省焦作地区太原组典型剖面上,共鉴定出类11属18种及11个未定种。根据类的组合特征,建立了一个类化石带两个亚带:Sphaeroschwagerina延限带,Quasifusulina-Pseudofusulina组合亚带和Schwagerina-Boultonia组合亚带。类在该区的出现次序是:Sphaeroschwagerina→Pseudofusulina→Quasifusulina→Schwagerina,其组合特征与当时华北板块大规模海侵密切相关。根据焦作太原组L1灰岩中首现Sphaeroschwagerina及类的演替特征等证据,石炭系-二叠系(C-P)界线应在太原组L1灰岩之下,太原组应划归下二叠统。
|
| 关 键 词： | 太原组 下二叠统 豫西北 |
GEOLOGIC AGE OF THE TAIYUAN FORMATION IN NORTHWEST HENAN PROVINCE:EVIDENCES FROM FUSULINIDS(FORAMINIFERA) |
| |
| Affiliation: | ,Institute of Resources and Environment,Henan Polytechnic University,State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences |
| |
| Abstract: | The paper focused on a typical section of the Taiyuan Formation in Jiaozuo,Henan.Based on detailed section measurement and description,a total of 11genera and 29species(including 11undetermined species)of fusulinids have been identified.According to the fusulinid assemblages,one zone and two subzones can be devided as follows,Sphaeroschwagerinazone;Quasifusulina-Pseudofusulina and Schwagerina-Boultonia subzones.The succession of fusulinids in Jiaozuo is Sphaeroschwagerina→Pseudofusulina→Quasifusulina→Schwagerina,and this evolutionary character was closely related to the widespread transgressions in North China.Based on the fact that Sphaeroschwagerina was firstly found in the No.1limestone,the boundary between Carboniferous and Permian in Jiaozuo should be placed at the base of the No.1limestone.Therefore,the Taiyuan Formation should be of the Lower Permian age. |
| |
| Keywords: | fusulinids Taiyuan Formation Lower Permian northwest of Henan Province |
| 本文献已被 CNKI 等数据库收录！ |
|
