滇黔地区拉丁期—卡尼期牙形石生物地层格架及沉积环境演变

发布时间：2018-06-13 09:49

本文选题：滇黔地区 + 拉丁期-卡尼期　；参考：《中国地质大学》2016年博士论文

【摘要】：二叠纪-三叠纪之交生物大灭绝事件和早三叠世的高温极端环境导致生物辐射和生态系统的复苏都受到抑制,直到中-晚三叠世生态系统全面复苏和发展,生物辐射,分异度直达顶峰。因此中-晚三叠世的生态环境和生物的协同演化成为新的研究热门。牙形石作为地层划分,古环境恢复的重要载体,为年代地层学和古环境恢复提供强大的支撑。本研究以华南滇东-黔西地区多条不同沉积环境下形成的剖面为载体,对其进行相对高精度的牙形石生物地层,无机碳化学地层,牙形石磷灰石氧同位素和草莓状黄铁矿粒径大小的统计研究,并结合事件地层探讨中-晚三叠世生态环境以及生态环境和生物的协同关系。本文研究的剖面主要有:云南省罗平县菜籽糖剖面,贵州省关岭县天硕剖面,贵州省关岭县卧龙岗剖面,贵州省关岭县巴毛林剖面和贵州省贞丰县踊跃剖面。这些剖面主要由杨柳井组,竹杆坡组和瓦窑组等岩石地层单元组成。底部:杨柳井组主要有厚层白云质灰岩,钙质白云岩组成,该组代表了浅水环境;中部:竹竿坡组的特征是由薄至中层瘤状灰岩组成,代表了较深水的环境;上部:瓦窑组主要由黑色页岩,薄层泥灰岩和泥晶灰岩组成,代表了盆地相的环境。本文取得如下进展:1.在贵州省贞丰县踊跃剖面从中三叠世安尼期-拉丁期至晚三叠世卡尼期共识别出6个牙形石带,由下至上依次为:Paragondolella foliata带,Quadralella polygnathiformis带,Quadralella tadpole带,Quadralella praelindae带,Quadralella auriformis和Quadralella robusta带。在云南省罗平县菜籽塘剖面从下至上共识别出4个牙形石带,分别为:Paragondolella foliata带,Quadralella polygnathiformis带,Quadralella auriformis带和Quadralella robusta带。在贵州省关岭县天硕剖面自下而上共识别出2个牙形石带,分别为Quadralella polygnathiformis带和Quadralella robusta带。依据牙形石Quadralella polygnathiformis首现层位,暂且标定了各剖面拉丁阶-卡尼阶界线。卧龙岗剖面牙形石产出及沉积特征指示剖面底部层为的时代为早卡尼期Julian 1/Julian 2之交,而整个瓦窑组可能延续到Tuvalian 2。2.华南滇黔地区卡尼雨季事件发生在竹竿坡组顶部至瓦窑组底部,即Quadralella auriformis带顶部至Quadralella robusta带。华南卡尼雨季事件伴随着碳酸盐岩生产终止,黑色页岩/砂岩沉积出现,无机碳同位素存在1.5‰-3‰的负漂,古海水温度存在2-5℃升高以及牙形石丰度和多样性的锐减,以及随后的海水底层缺氧-硫化。本文认为卡尼雨季事件的可能引发机制是Wrangellia大火成岩省产生大量温室气体,大气环流改变,全球变暖,风化加强,降雨增多,最终形成卡尼雨季事件。3.云南省罗平县菜籽糖剖面和贵州省贞丰县踊跃剖面中位于拉丁-卡尼阶界线下无机碳同位素存在2.5‰左右的负漂,依据华南牙形石序列,沉积学记录和绝对年龄,本文认为该次无机碳同位素的负漂的可能时代为拉丁期早期(Fassanian)。4.对贵州省关岭县卧龙岗剖面瓦窑组草莓状黄铁矿粒径大小的统计,显示粒径的平均值在3.5-5.5μm指示底层海水处于硫化-缺氧的状态,这可能是瓦窑组产出牙形石非常少的直接原因。5.依据贵州省贞丰县踊跃剖面和云南省罗平县菜籽塘剖面Quadralella polygnathiformis分别产于竹竿坡组底部以及剖面伴生牙形石动物群,确定华南广泛分布的“法郎组”底部竹竿坡组的时代应属于拉丁期-卡尼期。6.贵州省关岭县卧龙岗剖面记录了华南卡尼雨季事件后碳酸盐岩连续沉积厚达90米,而非直接赖石科组碎屑岩沉积,证实扬子碳酸盐岩淹没事件晚于华南卡尼雨季事件,而非同一事件。
[Abstract]:The Permian Triassic Permian mass extinction event and the early three fold high temperature extreme environment have led to the resuscitation of biological radiation and ecosystem, until the comprehensive recovery and development of the mid to late three fold ecosystem, biological radiation, and differentiation to the peak. Therefore, the Synergetic Evolution of the ecological environment and organisms in the middle and late three fold world became the co evolution of the ecological environment and the organism. As an important carrier of stratigraphic division and the restoration of paleoenvironment, odontostines provide strong support for chronostratigraphy and restoration of paleoenvironment. This study takes the profile of a number of different sedimentary environments in the East Southern China Qianxi region as a carrier, and carries out a relatively high degree of dentate biostratigraphy and inorganic carbon chemical formation. The statistical study of apatite apatite oxygen isotopes and the size of strawberry pyrite particle size, combined with the event stratigraphy to explore the middle late three fold ecological environment and the synergistic relationship between the ecological environment and the biological environment. The main sections of this paper are: the rapeseed sugar section in Luoping County, Yunnan Province, Tianshuo section in Guanling County, Guizhou Province, Wolong Guanling County Wolong, Guizhou The post section, the Ba Mao forest section in Guanling County, Guizhou and the Zhenfeng County of Guizhou Province, are mainly composed of Yangliujing formation, bamboo pole slope group and wa kiln group. The thin to middle layer of nodular limestone represents the deeper water environment, and the upper part is composed mainly of black shale, thin mudstone and argillaceous limestone, representing the environment of the basin facies. The following progress has been made in this paper: 1. in Zhenfeng County, Guizhou, 6 teeth were identified from the middle of the middle three anneni period to the late three Carney period. Paragondolella foliata belt, Quadralella polygnathiformis belt, Quadralella tadpole belt, Quadralella praelindae band, Quadralella auriformis and Quadralella robusta belt in the lower first order. 4 toothed stone belts in the rapeseed section of Luoping County, Yunnan Province The Quadralella polygnathiformis band, the Quadralella auriformis band and the Quadralella robusta belt are identified from the bottom of the Tianshuo section in Guanling County, Guizhou Province, which are the Quadralella polygnathiformis band and the Quadralella robusta belt respectively. According to the first occurrence of the odontoid Quadralella polygnathiformis, each of them has been demarcated. The profile Latin - Carney order boundary. The formation and sedimentary characteristics of the ODONTOS in Wollongang section indicate that the age of the bottom layer of the section is the intersection of early Carney phase Julian 1/Julian 2, while the whole tile kiln group may continue to the Carney rainy season in the Tuvalian 2.2. Southern China Yunnan Guizhou region, which occurred at the top of the bamboo pole group to the bottom of the kiln group, that is, Quadralella aurifor. MIS with the top to the Quadralella robusta belt. The Southern China Carney rainy season is accompanied by the termination of the carbonate production, the appearance of black shale / sandstone, the negative drift of 1.5 per thousand -3 per thousand of inorganic carbon isotopes, the increase in the temperature of the ancient sea water, the sharp decrease in the abundance and diversity of the odontoid, and the subsequent hypoxia vulcanization of the bottom of the sea water. The possible initiation mechanism for the Carney rainy season is that the Wrangellia igneous province produces a large amount of greenhouse gases, atmospheric circulation changes, global warming, weathering, increased rainfall, and the eventual formation of the Carney rainy season event,.3. Yunnan Province, Yunnan province and Zhenfeng County, Guizhou Province, which is located in the Latin Carney boundary line with the same inorganic carbon. The negative drift of the position element is about 2.5 per thousand. According to the sequence of ODONTOS in Southern China, the sedimentology record and the absolute age, the possible age of negative drift of the inorganic carbon isotope is the statistics of the size of the grain size of the strawberry shaped pyrite in the early Latin stage (Fassanian).4. in the Wollongang section of Guanling County, Guizhou Province, showing that the average size of the particle size is 3.. 5-5.5 mu m indicates that the bottom sea water is in the state of vulcanization and anoxia, which may be the direct cause of the very few ODONTOS produced in the wa kiln group..5. is produced in the base of the bamboo slope group in Zhenfeng County of Guizhou province and Quadralella polygnathiformis of the rapeseed pond section of Luoping County, Yunnan Province, respectively, and the concomitant conodont fauna of the section is determined in Southern China. The widely distributed "Franc group" at the bottom of the bamboo pole group should belong to the Latin period - Carney period.6. Guizhou Guanling Wollongang section recorded the Southern China Carney rainy season after the precipitation of 90 meters thick carbonate rocks, and not the direct Lai Shike group clastic rock deposition, confirmed that the Yangtze carbonate rock submerge event was later than Southern China Carney rainy season event. Not the same event.
【学位授予单位】：中国地质大学
【学位级别】：博士
【学位授予年份】：2016
【分类号】：Q915;P512.2

【相似文献】