山东兖州煤田太原组类动物群及石炭-二叠系界线探讨

STUDY ON THE FUSULINID FAUNA AND THE CARBONIFEROUS-PERMIAN BOUNDARY IN THE TAIYUAN FORMATION FROM THE YANZHOU COALFIELD, SHANDONG PROVINCE

通过对山东兖州煤田太原组类动物群的系统研究,共鉴定出类化石12属103种及部分未定种。根据类化石在地层中的分布和垂向变化规律,自上而下建立一个带三个亚带:Schwagerina带:3)Triticitesparvus-Quasifusulinalongissima亚带,2)Schwagerinagregaria-Boultoniawillsi亚带,1)Quasifusulinapseudocayeuxi-Rugosofusulinavalida亚带。通过与邻区及华北部分地区对比,本区太原组类动物群的地质时代为早二叠世早期,本区石炭-二叠系界线应置于太原组第十一层灰岩之底。

By a systematic study of the fusulinid fauna in the Taiyuan Formation from the Yanzhou coalfield, Shandong Province, 12 genera and 105 species of fusulinids have been found. According to the geographical distribution and vertical variation of fusulinids in the strata, 1 assemblage and 3 subassemblages may be distinguished as follows （in descending order）： Schwagerina assemblage, 3） Triticites parvus-Ouasifusulina longissirna subassemblage, 2） Schwagerina gregaria-Boultonia willsi subassemblage, 1） Quasi fusulina pseudocayeuxi - Rugoso fusulina valida subassemblage. Compared with those in nearby regions and some other areas in North China, the geological age of the Yanzhou coalfield should be early Early Permian, and the boundary between the Carboniferous and Permian in the Yanzhou coalfield should be placed at the bottom of No. 11 limestone in the lower portion of the Taiyuan Formation.