本文選題：先鋒礦區(qū)　切入點：有孔蟲　出處：《中國礦業(yè)大學》2015年碩士論文

【摘要】：二疊紀末的生物大滅絕與三疊紀初生物復蘇是顯生宙生命發(fā)展史上最偉大的變革,見證了海洋生態(tài)系結(jié)構(gòu)的巨大轉(zhuǎn)變,同時也促使古生代生物群向現(xiàn)代生物群的轉(zhuǎn)變。二疊紀末期生物大滅絕的型式是當前古生物學研究的熱點問題之一。而通過詳細的碳酸鹽巖沉積微相及古生物特征的研究能夠識別碳酸鹽巖沉積歷史的整體或局部環(huán)境。在ZK1501孔及ZK17503兩個鉆孔的P-T界限附近共識別了碳酸鹽巖緩坡相、鑲邊碳酸鹽巖臺地相兩個沉積相;高能生屑淺灘、局限內(nèi)緩坡、開闊海內(nèi)緩坡、開闊海中緩坡、泥炭沼澤相、局限臺地相、開闊海臺地7個沉積亞相和26個微相類型。識別了有孔蟲18屬,72種,統(tǒng)計分析表明主要為Glomospira、Hemigordius、Nodosaria及Pachyphloia等種屬。通過多種生物的統(tǒng)計分析,將P-T界限附近生物的組合劃分為粗枝藻-大殼有孔蟲、造煤植物、復蘇生物、小化介形蟲、底棲生物及鈣質(zhì)微生物、殘存生物群、廣棲性生物群和介形蟲生物群八個生物組合帶。發(fā)現(xiàn)了236-5層出現(xiàn)了二疊紀末的三葉蟲-粗枝藻生物群,之后全部滅絕。根據(jù)區(qū)域?qū)Ρ?將ZK1501孔的P-T界限定于236-4層底部之上的3-4厘米之處,而相對應的ZK17503孔則位于k9-13層內(nèi)。
[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.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：Q915;P588.245

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