本文選題：經(jīng)棚古湖　切入點(diǎn)：典型湖相沉積剖面　出處：《中國地質(zhì)大學(xué)(北京)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：克什克騰旗位于內(nèi)蒙古自治區(qū)東部,地處大興安嶺西南端,屬于半濕潤與干旱半干旱氣候分界線附近。本文以經(jīng)棚古湖沉積物為研究對象,在前人的研究基礎(chǔ)上,通過大量野外實(shí)地調(diào)查,利用沉積地層學(xué)、年代學(xué)及遙感地質(zhì)學(xué)等多種方法,系統(tǒng)深入探討克什克騰經(jīng)棚古湖的形成與演化以及古湖演化與西拉木倫河演化的關(guān)系。主要取得以下認(rèn)識:1.研究區(qū)位于西拉木倫河中上游水系發(fā)育,地形差異較大,河流階地地貌發(fā)育。其干流和支流普遍發(fā)育5、6級階地。階地類型以基座階地和堆積階地為主,少數(shù)可見侵蝕階地。不同河段階地變化大,河谷地貌特征存在較大差異。2.綜合分析湖相沉積剖面特征可知,經(jīng)棚古湖沉積物連續(xù)分布于西拉木倫河上游兩岸,在平面上呈樹枝狀分布,分布面積約232km2。湖相層分布的最高海拔在921~1120m之間,在不同河段形成不同程度沉積。3.根據(jù)測得的年代數(shù)據(jù),結(jié)合前人的資料表明:經(jīng)棚古湖相沉積的年齡在11~34ka之間,其時(shí)間跨度是從晚更新世晚期(Q_p~(3-3))至全新世早期(Qh1),中間淤積年齡約23千年。4.根據(jù)研究區(qū)地質(zhì)地貌特征和典型沉積剖面特征分析,本文初步認(rèn)為經(jīng)棚古湖為一古堰塞湖。其成因可能是由于地震活動等原因引起山崩滑坡體或泥石流堵塞河床,使得西拉木倫河上游河水聚集形成湖泊。5.在經(jīng)棚古湖演化過程中,構(gòu)造運(yùn)動、氣候變化和水系變遷這三個(gè)因素均起到重要作用。
[Abstract]:Keshiketeng Banner is located in the eastern part of Inner Mongolia Autonomous region, located at the southwest end of the Daxingan Mountains, which belongs to the boundary between semi-humid and arid and semi-arid climates. Through a large number of field investigations, and by using various methods such as sedimentary stratigraphy, chronology and remote sensing geology, The formation and evolution of Keshiketeng through the ancient lake and the relationship between the evolution of the ancient lake and the evolution of the Xilamurun River are systematically discussed. The main conclusions are as follows: 1. The study area is located in the middle and upper reaches of the Xilamurun River, and the topography is quite different. The river terraces are developed. The main stream and tributaries generally develop 5 or 6 terraces. The terrace types are mainly pedestal terraces and accumulation terraces, and a few visible erosion terraces. The terraces of different river segments vary greatly. 2. Comprehensive analysis of the lacustrine sedimentary profile shows that the sediments distributed continuously in the upper banks of the Xilamurun River, and distributed in a dendritic shape on the plane. The distribution area is about 232km2. The maximum elevation of lacustrine facies distribution is between 921 ~ 1120m, and the sedimentary sediment of different extent is formed in different reaches. 3. Based on the dating data obtained and combined with previous data, it is shown that the sedimentary age of paleolacustrine facies is between 1134 ka and 1134 ka. Its time span is from late late Pleistocene to early Holocene QH1. The intermediate deposition age is about 23000.4.According to the geological and geomorphological characteristics of the study area and the characteristics of typical sedimentary profiles, In this paper, it is preliminarily considered that the ancient lake is an ancient barrier lake, which may be caused by landslide or debris flow caused by seismic activity, which makes the upper reaches of the Xilamurun River gather into a lake .5.In the course of the evolution of the ancient lake through the shed, Tectonic movement, climate change and water system change all play an important role.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P531

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