本文選題：貴州織金 + 二疊紀(jì)-三疊紀(jì)��； 參考：《中國(guó)礦業(yè)大學(xué)》2017年碩士論文

【摘要】：貴州織金剖面火山凝灰質(zhì)黏土巖比較發(fā)育,地層連續(xù),為華南地區(qū)二疊紀(jì)-三疊紀(jì)之交斜坡相地層或盆地相地層對(duì)比、沉積特征、生物演化與古海洋化學(xué)狀態(tài)特征的研究提供了非常好的條件。本文以貴州織金剖面為研究對(duì)象,通過(guò)資料收集、野外勘查、實(shí)驗(yàn)室分析和鏡下觀察,對(duì)研究區(qū)的有孔蟲類型以及對(duì)古海洋化學(xué)狀態(tài)響應(yīng)進(jìn)行了研究。經(jīng)統(tǒng)計(jì),貴州織金剖面一共鑒定了有孔蟲15個(gè)屬36個(gè)種,劃分出了3個(gè)有孔蟲組合帶。根據(jù)有孔蟲演化揭示了:區(qū)內(nèi)有孔蟲一共出現(xiàn)了兩次生物驟減,第一次驟減之后,有少量的有孔蟲延續(xù)到了上覆地層,第二次驟減之后,上覆地層有孔蟲極少或滅絕;與浙江煤山剖面的對(duì)比,確定貴州織金剖面第一次生物大滅絕滅絕線為第5層頂,第二次位于第8層,P-T界線確定在7-1小層頂,7-2小層底。通過(guò)鐵組分和微量元素測(cè)試,分析了貴州織金二疊紀(jì)末-三疊紀(jì)初水體中的含氧量呈震蕩的變化,總體上二疊紀(jì)末是氧化環(huán)境,三疊紀(jì)初是缺氧環(huán)境。有孔蟲的演化與海水中的含氧量呈很好的相關(guān)性,當(dāng)氧量相對(duì)增加,有孔蟲繁盛,當(dāng)含氧量相對(duì)減少,有孔蟲衰減。探討了造成二疊紀(jì)末生物大規(guī)模滅絕和古海洋化學(xué)狀態(tài)變遷的原因有可能是二疊紀(jì)末大規(guī)模的火山活動(dòng)。
[Abstract]:Volcanic tuffaceous clay rocks in the Zhijin section, Guizhou Province, are relatively developed and the strata are continuous, which is the correlation of slope facies and basin facies strata between Permian-Triassic in South China, with sedimentary characteristics. Biological evolution and the characteristics of paleooceanic chemical state provide very good conditions. In this paper, the foraminifera type and the response to paleooceanic chemical state in the study area were studied by data collection, field exploration, laboratory analysis and microscopic observation. According to statistics, a total of 15 genera and 36 species of foraminifera were identified and 3 foraminiferal assemblages were identified in Zhijin section of Guizhou Province. According to the evolution of foraminifera, the foraminifera occurred two times in the region. After the first dip, a small number of foraminifera continued to the overlying strata, and after the second dip, there were few or no foraminifera in the overlying strata. Compared with the coal-mountain section of Zhejiang Province, the first extinction line of the Zhijin section in Guizhou is determined to be the top of the fifth layer, and the second one is located at the bottom of the 7-1 layer top and the second layer at the P-T boundary of the 8th layer. Based on the measurement of iron composition and trace elements, the oxygen content in the water body of the late Permian to the early Triassic in Zhijin, Guizhou Province was analyzed. The oxygen content in the water was oscillating. In general, the late Permian was an oxidation environment, and the early Triassic was an anoxic environment. The evolution of foraminifera has a good correlation with the oxygen content in seawater. When the oxygen content increases, foraminifera flourish, and foraminifera decay when oxygen content decreases. It is discussed that the reason for the mass extinction of the late Permian organisms and the change of paleo-marine chemical state may be the large-scale volcanic activity at the end of the Permian.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：Q915;P534

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