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川西北地区晚三叠世卡尼期古喀斯特特征及研究意义

发布时间:2018-06-30 19:12

  本文选题:晚三叠世 + 卡尼期 ; 参考:《成都理工大学》2017年硕士论文


【摘要】:卡尼期湿润气候事件是三叠纪内最为显著的全球性气候事件,其在中国的川西北地区、贵州、云南等地都被等时地识别出来。卡尼阶在川西北汉旺青岩沟、观音崖剖面以及安县雎水剖面自下而上表现出由生物灰岩到黑色页岩(粉砂质泥岩)的岩性转变。前人认为从生物颗粒灰岩到黑色页岩反映出水体由浅变深的过程。此次在川西北地区绵竹汉旺、安县雎水剖面上三叠统卡尼阶海绵礁(丘)灰岩顶部发现古喀斯特的存在,表明川西北地区的岩层在卡尼期经历过一次暴露,其后水体逐渐变深,而后在喀斯特之上沉积黑色页岩(粉砂质泥岩)。本次研究通过野外剖面勘察、采样及室内薄片分析,古生物化石鉴定等手段,结合国内外卡尼期事件、龙门山构造活动以及喀斯特的研究资料与方法,对卡尼阶剖面中喀斯特的具体形成时代和成因以及其与卡尼事件及龙门山隆升事件之间的关系进行探讨。在野外岩石露头表面可见明显的花斑状构造以及蜂窝状溶孔,显微镜下可见泥晶化颗粒,喀斯特角砾以及喀斯特溶孔充填物,其中包括泥-亮晶方解石,生物碎屑以及陆源石英颗粒。根据露头岩性和显微薄片特征判断其属于早成岩期喀斯特;喀斯特成单层发育,之上覆盖化石丰富的黑色页岩(粉砂质泥岩),其中的菊石化石鉴定表明其为上卡尼阶底部沉积。喀斯特之上的岩性在汉旺和雎水有差异:在绵竹汉旺青岩沟剖面,喀斯特灰岩之上覆盖有黑色粉砂质页岩,在汉旺观音崖剖面,喀斯特面之上发育黑色页岩,在安县雎水剖面,古喀斯特发育在滚落的海绵巨砾之上。化石证据表明该喀斯特的形成时代应在早卡尼期至晚卡尼早期。喀斯特的形成与地层的暴露以及水体的冲刷淋滤有关,而该喀斯特的形成时间与龙门山的隆升以及卡尼期湿润气候事件在发生时间上非常相近;综合研究表明,推测该喀斯特的形成与早期龙门山的隆升以及卡尼期湿润气候事件有关。
[Abstract]:Carney humid climate event is the most significant global climate event in the Triassic. It has been identified in northwestern Sichuan, Guizhou, Yunnan and other places in China. From the bottom to the top of Hanwang Qingyan ditch, Guanyin Cliff section and Anxian Jushui section in northwestern Sichuan, the Karni stage shows lithologic transformation from biolimestone to black shale (silty mudstone). Previous researchers believe that the process from biogranular limestone to black shale reflects the water body from shallow to deep. The discovery of paleokarst on the top of the cavernous reef (mound) limestone of the Triassic Carney terrace in Hanwang Mianzhu, northwestern Sichuan, Anxian Jushui section, shows that the rock strata in the northwestern part of Sichuan experienced an exposure during the Carney period, and then the water gradually deepened. Black shale (silty mudstone) is then deposited on top of karst. In this study, by means of field profile survey, sampling and indoor slice analysis, and identification of paleontological fossils, combined with domestic and foreign Carney events, Longmen Mountain tectonic activities and karst research data and methods, This paper discusses the formation age and origin of karst in Karni stage profile and its relationship with Karni event and Longmen Mountain uplift event. On the surface of outcrops in the field, there are obvious blotchy structures and honeycomb dissolution pores. Under the microscope, there are mud crystals, karst boulders and karst dissolved pore fillings, including mud and bright crystal calcite, Bioclastic and terrestrial quartz particles. According to the characteristics of outcrop lithology and microslice, it belongs to the early diagenetic karst stage, the karst monolayer developed, and covered with rich fossil black shale (silty mudstone). The identification of the permite fossils indicates that it is the bottom deposit of the upper Carney stage. The lithology of karst is different between Hanwang and Ju water: in Mianzhu Hanwang Qingyanggou section, karst limestone is covered with black silty shale, in Hanwang Guanyin Cliff section, black shale is developed above karst surface, and in Anxian Ju Shui section, Ancient karst developed on top of falling spongy boulders. Fossil evidence suggests that the karst was formed from early Carney to early late Carney. The formation of karst is related to the exposure of strata and the erosion and leaching of water body, and the formation time of karst is very close to the uplift of Longmen Mountain and the humid climate event of Carney period. It is speculated that the formation of this karst is related to the uplift of the early Longmen Mountains and the humid climatic events of the Carney period.
【学位授予单位】:成都理工大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:P534.51;P642.25

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