本文選題：晚三疊世 + 卡尼期　； 參考：《成都理工大學》2017年碩士論文

【摘要】：卡尼期濕潤氣候事件是三疊紀內最為顯著的全球性氣候事件,其在中國的川西北地區(qū)、貴州、云南等地都被等時地識別出來�？犭A在川西北漢旺青巖溝、觀音崖剖面以及安縣雎水剖面自下而上表現出由生物灰?guī)r到黑色頁巖(粉砂質泥巖)的巖性轉變。前人認為從生物顆�；�?guī)r到黑色頁巖反映出水體由淺變深的過程。此次在川西北地區(qū)綿竹漢旺、安縣雎水剖面上三疊統(tǒng)卡尼階海綿礁(丘)灰?guī)r頂部發(fā)現古喀斯特的存在,表明川西北地區(qū)的巖層在卡尼期經歷過一次暴露,其后水體逐漸變深,而后在喀斯特之上沉積黑色頁巖(粉砂質泥巖)。本次研究通過野外剖面勘察、采樣及室內薄片分析,古生物化石鑒定等手段,結合國內外卡尼期事件、龍門山構造活動以及喀斯特的研究資料與方法,對卡尼階剖面中喀斯特的具體形成時代和成因以及其與卡尼事件及龍門山隆升事件之間的關系進行探討。在野外巖石露頭表面可見明顯的花斑狀構造以及蜂窩狀溶孔,顯微鏡下可見泥晶化顆粒,喀斯特角礫以及喀斯特溶孔充填物,其中包括泥-亮晶方解石,生物碎屑以及陸源石英顆粒。根據露頭巖性和顯微薄片特征判斷其屬于早成巖期喀斯特;喀斯特成單層發(fā)育,之上覆蓋化石豐富的黑色頁巖(粉砂質泥巖),其中的菊石化石鑒定表明其為上卡尼階底部沉積�？λ固刂系膸r性在漢旺和雎水有差異:在綿竹漢旺青巖溝剖面,喀斯特灰?guī)r之上覆蓋有黑色粉砂質頁巖,在漢旺觀音崖剖面,喀斯特面之上發(fā)育黑色頁巖,在安縣雎水剖面,古喀斯特發(fā)育在滾落的海綿巨礫之上�；C據表明該喀斯特的形成時代應在早卡尼期至晚卡尼早期。喀斯特的形成與地層的暴露以及水體的沖刷淋濾有關,而該喀斯特的形成時間與龍門山的隆升以及卡尼期濕潤氣候事件在發(fā)生時間上非常相近;綜合研究表明,推測該喀斯特的形成與早期龍門山的隆升以及卡尼期濕潤氣候事件有關。
[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.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P534.51;P642.25

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