先锋矿区P-T界限附近地层碳酸盐岩微相与有孔虫分布研究

发布时间：2018-03-30 14:25

本文选题：先锋矿区　切入点：有孔虫　出处：《中国矿业大学》2015年硕士论文

【摘要】：二叠纪末的生物大灭绝与三叠纪初生物复苏是显生宙生命发展史上最伟大的变革,见证了海洋生态系结构的巨大转变,同时也促使古生代生物群向现代生物群的转变。二叠纪末期生物大灭绝的型式是当前古生物学研究的热点问题之一。而通过详细的碳酸盐岩沉积微相及古生物特征的研究能够识别碳酸盐岩沉积历史的整体或局部环境。在ZK1501孔及ZK17503两个钻孔的P-T界限附近共识别了碳酸盐岩缓坡相、镶边碳酸盐岩台地相两个沉积相;高能生屑浅滩、局限内缓坡、开阔海内缓坡、开阔海中缓坡、泥炭沼泽相、局限台地相、开阔海台地7个沉积亚相和26个微相类型。识别了有孔虫18属,72种,统计分析表明主要为Glomospira、Hemigordius、Nodosaria及Pachyphloia等种属。通过多种生物的统计分析,将P-T界限附近生物的组合划分为粗枝藻-大壳有孔虫、造煤植物、复苏生物、小化介形虫、底栖生物及钙质微生物、残存生物群、广栖性生物群和介形虫生物群八个生物组合带。发现了236-5层出现了二叠纪末的三叶虫-粗枝藻生物群,之后全部灭绝。根据区域对比,将ZK1501孔的P-T界限定于236-4层底部之上的3-4厘米之处,而相对应的ZK17503孔则位于k9-13层内。
[Abstract]:The great extinction of life at the end of Permian and the recovery of life at the beginning of Triassic were the greatest changes in the history of life development in the Phanerozoic, and witnessed the great changes in the structure of marine ecosystems. At the same time, it also promoted the transformation of Paleozoic biota to modern biota. The pattern of bioextinction in late Permian period is one of the hot issues in paleontology research. And through detailed carbonate sedimentary microfacies and paleontological characteristics. The study can identify the whole or local environment of carbonate sedimentary history. The gentle slope facies of carbonate rock were identified near the P-T boundary of ZK1501 hole and ZK17503 borehole. Two sedimentary facies of rimmed carbonate platform facies: high energy debris shoal, limited inner gentle slope, open sea gentle slope, open sea gentle slope, peat marsh facies, limited platform facies, There are 7 sedimentary subfacies and 26 microfacies types in open sea platform. 72 species of foraminifera belonging to 18 genera have been identified. Statistical analysis shows that they are mainly species and genera of Glomospirae Hemigordius Nodosaria and Pachyphloia. The assemblage of organisms near the P-T boundary was divided into four groups: Cladophyllum macrophacia, coal-producing plants, resuscitation, ostracoda, benthos and calcium microbes, and residual biota. Eight assemblages of benthic biota and ostracod biota were found in the 236-5 layer, where the late Permian trilobites and Trichoderma biota were found, and then all of them were extinct. The P-T limit of the ZK1501 hole is set at 3-4 cm above the bottom of the 236-4 layer, while the corresponding ZK17503 hole is located in the k9-13 layer.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：Q915;P588.245

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