广西乐业上岗剖面三叠系底部微生物岩中的介形虫化石组合变化  

CHANGES OF THE OSTRACOD COMMUNITIES FROM THE LOWERMOST TRIASSIC MICROBIALITES AT THE SHANGGANG SECTION,LEYE,GUANGXI

作　　者：吉霞 黄云飞[1,2] 孙鑫 楚道亮[2] 代旭 田力 JI Xia;HUANG Yunfei;SUN Xin;CHU Daoliang;DAI Xu;TIAN Li(School of Geosciences,Yangtze University,Wuhan 430100,China;State Key Laboratory of Biogeology and Environmental Geology,School of Earth Sciences,China University of Geosciences,Wuhan430074,China)

机构地区：[1]长江大学地球科学学院,武汉430100 [2]中国地质大学(武汉)生物地质与环境地质国家重点实验室,地球科学学院,武汉430074

出　　处：《微体古生物学报》2024年第2期118-141,共24页Acta Micropalaeontologica Sinica

基　　金：国家自然科学基金项目(42030513);生物地质与环境地质国家重点实验室开放课题(GBL22103)共同资助。

摘　　要：通过对广西乐业上岗剖面三叠系底部微生物岩段微体化石的高分辨率采样和精细处理,共获得4756枚介形虫化石,鉴定出27属96种。群落分析结果显示存在2个介形虫组合,分别是Bairdia wailiensis-Liuzhinia antalyaensis-Bairdiacypris ottomanensis组合和Bairdiacypris ottomanensis-Liuzhinia antalyaensis-Paracypris gaetanii组合。微生物岩段下部属种多样性高,没有明显的优势种,而微生物岩段上部则以Bairdiacypris ottomanensis,Liuzhinia antalyaensis,Paracypris gaetanii为优势种。总体上呈现出生物多样性减少,优势度上升的趋势,可能是种间竞争的结果。In this study,about 4756 ostracod specimens were obtained from the lowermost Triassic microbialites following the end-Permian mass extinction at the Shanggang section,Leye City,Guangxi Zhuang Autonomous Region.These ostracods could be assigned to 96 species in 27 genera.Two ostracod assemblages were recognized:Bairdia wailiensis-Liuzhinia antalyaensis-Bairdiacypris ottomanensis assemblage and Bairdiacypris ottomanensis-Liuzhinia antalyaensis-Paracypris gaetanii assemblage.The lower part of the microbialites was characterized by high diversity of genus and species with no obvious dominant species,while the upper part of the microbialites was dominated by Bairdiacypris ottomanensis,Liuzhinia antalyaensis and Paracypris gaetanii.The overall trend of decline in biodiversity and increase in dominance may be the result of interspecific competition.

关 键 词：微体化石 介形虫 微生物岩 生物灭绝 二叠纪-三叠纪 

分 类 号：Q915.2[天文地球—古生物学与地层学]