新疆塔里木玉北井区早奥陶世古环境及生态组合时空分布  

THE TEMPORAL-SPATIAL DISTRIBUTION OF THE EARLY ORDOVICIAN ECOASSEMBLAGES IN THE YUBEI AREA,TARIM BASIN,XINJIANG,NORTHWEST CHINA AND ITS PALEOENVIRONMENTAL SIGNIFICANCE

作　　者：蔡习尧[1] 吴亚生[2,3] 李阳 刘丽静[2,3] 赵锐 CAI Xiyao;WU Yasheng;LI Yang;LIU Lijing;ZHAO Rui(SINOPEC Exploration ＆ Production Research Institute,Beijing 100083;Key Laboratory of Petroleum Research,CAS;Institute of Geology and Geophysics,Chinese Academy of Science,Beijing 10002;3 University of Chinese Academy of Sciences,Beijing 100049)

机构地区：[1]中国石油化工股份有限公司石油勘探开发研究院,北京100083 [2]中国科学院油气资源研究重点实验室中国科学院地质与地球物理研究所,北京100029 [3]中国科学院大学,北京100049

出　　处：《微体古生物学报》2018年第3期273-285,共13页Acta Micropalaeontologica Sinica

基　　金：国家自然科学基金(41372121);国家科技重大项目(2016ZX05004006-002)共同资助~~

摘　　要：新疆塔里木板块玉北地区下奥陶统沉积于极浅海带碳酸盐岩沉积区,化石密度普遍很低,依据该地区6口钻井的化石碎片类型以及所赋存的围岩特征可划分出6种生态组合:三叶虫-介形类组合或介形类组合;介形类-三叶虫组合或三叶虫组合;棘屑-三叶虫组合;三叶虫-棘皮类组合;海绵-三叶虫-介形类组合和三叶虫-腕足类组合。生态组合和沉积微相分析表明,玉北地区该地质时期共有三次沉积环境变迁:蓬莱坝组顶部-鹰山组底部沉积期为局限台地潮坪环境;鹰山组下部沉积期为局限台地潮坪与潮沟交互环境;鹰山组中部沉积期为局限台地潮坪环境;鹰山组上部沉积期为局限台地潮坪与潮沟交互或者局部的局限台地潮坪环境。The early Ordovician ecoassemblages in Yubei area,Tarim basin,Xinjiang,Northwest China was conducted in this study.Six ecoassemblages were recognized,including trilobite-ostracod or ostracod assemblage,ostracodtrilobite or trilobite assemblage,echinoderm-trilobite assemblage,trilobite-crinoid assemblage,sponge-trilobite-ostracod assemblage,and trilobite-brachiopod assemblage.We also found that different strata have different associations of assemblages.In the early Ordovician,the depositional environment changed three times,but the main environment is limited platform.During the deposition time of upper Penglaiba Formation to the bottom of the Yingshan Formation,the depositional environment is tidal-flat environment,while during the early deposition time of the Yingshan Formation,the sedimentary environment is tidal-flat alternative with tidal channel.In the middle deposition time of the Yingshan Formation,the sedimentary environment is dominated by tidal-flat.During the late deposition time of the Yingshan Formation,the dominated depositional environments include tidal-flats and tidal channels.

关 键 词：生态组合 早奥陶世 玉北地区 塔里木板块 新疆 

分 类 号：Q91[天文地球—古生物学与地层学]