本文選題：共和盆地 + 古流向分析　； 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：對(duì)于青海省東部共和盆地的研究,不僅能揭示出在早—中三疊世時(shí)期共和盆地的盆地屬性,對(duì)恢復(fù)當(dāng)時(shí)該地區(qū)的古地理面貌,對(duì)研究盆地及其周緣的構(gòu)造演化也有著非常重要的意義。本文利用典型的物源分析對(duì)共和盆地的物源進(jìn)行研究,然后根據(jù)地層特征結(jié)合物源性質(zhì)來(lái)揭示共和盆地的盆地屬性。首先,根據(jù)文獻(xiàn)資料和野外考察發(fā)現(xiàn)盆地內(nèi)東部和西部早—中三疊世的沉積物具有不同特征,地層序列也與弧后盆地地層相似,其火山巖的組成也與弧后盆地類似;然后根據(jù)古流向研究確定物源來(lái)自于西部、東北部以及南部;從迪金森三角圖解法確定物源來(lái)自于再旋回造山帶以及巖漿弧物源區(qū),與弧后盆地的沉積物源相同;通過(guò)地球化學(xué)方法得到物源區(qū)母巖的構(gòu)造背景分別是活動(dòng)大陸邊緣以及大陸島弧,顯示其物源為火山及陸源物質(zhì);然后通過(guò)重礦物分析方法再次確定物源來(lái)自于三個(gè)方向,即東昆侖、南祁連、阿尼瑪卿山。最后根據(jù)以上結(jié)果,共和盆地物源主要有東北方的祁連造山帶和西方的東昆侖巖漿弧,還有南部的阿尼瑪卿山(在此時(shí)期阿尼瑪卿山已經(jīng)隆起),東昆侖此時(shí)期處于火山活躍時(shí)期,東北部的祁連造山帶為盆地的陸相物源供給區(qū),盆地周圍并無(wú)廣闊的大洋在當(dāng)時(shí)。西部火山相,東部陸相,古地理位置又恰好位于火山弧后與造山帶淺海之間,再根據(jù)盆地內(nèi)地層充填序列發(fā)現(xiàn)其為典型的弧后盆地沉積特征,所以確定共和盆地在早—中三疊世時(shí)期為一弧后盆地。
[Abstract]:The study of the Gonghe Basin in eastern Qinghai Province can not only reveal the basin attributes of the Gonghe Basin during the early and Middle Triassic, but also restore the paleogeographic features of the area at that time. It is also of great significance to study the tectonic evolution of the basin and its periphery. In this paper, the provenance of Gonghe basin is studied by means of typical provenance analysis, and then the basin attributes of Gonghe basin are revealed according to stratigraphic characteristics and provenance properties. Firstly, according to the literature and field investigation, it is found that the sediments of the eastern and western part of the basin have different characteristics, the stratigraphic sequence is similar to that of the back-arc basin, and the composition of the volcanic rocks is similar to that of the back-arc basin. According to the study of paleodirection, the source is from the west, the northeast and the south, and from the Dickinson triangle diagram, the source comes from the re-cycle orogenic belt and the source of magmatic arc, which is the same as the sediment source of the back-arc basin. The tectonic setting of the parent rocks in the source area is obtained by geochemical method, which shows that the active continental margin and the continental island arc are the source of volcanic and continental source materials, and the source is determined from three directions by the method of heavy mineral analysis. That is, East Kunlun, South Qilian, the Animaqing Mountains. Finally, according to the above results, the provenance of the Gonghe Basin mainly consists of the Qilian orogenic belt in the northeast and the eastern Kunlun magmatic arc in the west. There are also the Animaqing Mountains in the south (the Animaqing Mountains have been uplifted in this period, the East Kunlun is in the period of volcanic activity, the Qilian orogenic belt in the northeast is the continental material supply area of the basin, and there is no broad ocean around the basin at that time. The western volcanic facies, the eastern continental facies and the paleogeographic location are located between the volcanic arc and the shallow sea of the orogenic belt. According to the filling sequence of the interior layer of the basin, it is found to be a typical sedimentary feature of the back-arc basin. Therefore, the Gonghe basin was determined to be a back-arc basin during the early-Middle Triassic.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P534.51

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