本文選題：個舊地區(qū) + 海相盆地�。� 參考：《昆明理工大學(xué)》2015年碩士論文

【摘要】：云南省個舊地區(qū)位于華南板塊南緣處的右江盆地(或稱南盤江盆地、滇黔桂盆地)之西南隅,并以生產(chǎn)錫礦而聞名中外。工作區(qū)位于云南省個舊市南部,前人對該區(qū)域進行了大量的地質(zhì)填圖及礦產(chǎn)勘查,但對地層層序特征的研究普遍較弱,因此本文以層序地層學(xué)、造山帶地層學(xué)、巖相古地理學(xué)、板塊學(xué)說等理論為指導(dǎo),在前人研究的基礎(chǔ)上,結(jié)合主干剖面的測制與區(qū)域構(gòu)造背景,對個舊地區(qū)三疊系進行層序地層學(xué)研究,查明各層序的沉積相及沉積體系特征,并對所處右江盆地進行該時期大地構(gòu)造背景的分析�？傮w上工作區(qū)內(nèi)地層接觸關(guān)系清楚,所涉及的三疊紀地層剖面包括三條實測剖面與三條前人測制剖面,包括三疊系下統(tǒng)冼馬塘組(Tlx)與嘉陵江組(T1j)、中統(tǒng)個舊組(T2g)與法郎組(T2f)、下統(tǒng)把南組(T3b)與火把沖組(T3h)。現(xiàn)將其共分為3個二級層序,具體分為7個三級層序,由2個陸棚邊緣體系域(LST)、6個海侵體系域(TST)和7個高位體系域(HST)組成,層序界面多為巖相轉(zhuǎn)換面與火山事件界面,沉積體系包括碳酸鹽臺地沉積體系、淺海陸棚沉積體系以及濱岸沉積體系。結(jié)合三疊紀地層的沉積相環(huán)境以及對大地構(gòu)造背景的整合分析,認為右江盆地為印支運動的產(chǎn)物,為受古特提斯構(gòu)造與濱太平洋構(gòu)造作用下的復(fù)合盆地,經(jīng)歷由志留紀末期開始的陸內(nèi)裂谷盆地階段—被動邊緣裂谷盆地—弧后裂谷盆地—前陸盆地階段受充填消亡的演化過程,其淺海相臺地不斷消亡并最后接收陸源沉積物的充填。
[Abstract]:Located in the southwestern corner of the Youjiang basin (or the Nanpan River Basin, the Yunnan Guizhou Guangxi basin) in the southern edge of the Southern China plate, the old area of Yunnan province is famous for the production of tin deposits. The working area is located in the southern part of the old city of Yunnan province. The predecessors have carried out a large number of geological mapping and mineral exploration in the region, but the study of the sequence sequence characteristics is generally weak. Therefore, based on the theory of sequence stratigraphy, orogenic belt stratigraphy, lithofacies palaeogeography, plate theory and so on, based on the predecessors' research, the sequence stratigraphy of the Triassic System in the old area is studied, the sedimentary facies and depositional system characteristics of each sequence are identified, and the Youjiang basin is located. The geodetic background of this period is analyzed. In general, the contact relationship between the interior layers of the working area is clear, and the Triassic stratigraphic sections involved include three measured sections and three previous measurement sections, including the lower Triassic Xian Ma Tong formation (Tlx) and the Jialingjiang group (T1j), the middle old group (T2g) and the franc group (T2f), and the lower Southern Group (T3b). T3h, which is divided into 3 two sequence sequences, is divided into 7 three order sequences, consisting of 2 continental margin system domains (LST), 6 transgressive system domains (TST) and 7 high position system domains (HST). The sequence interface is mainly the lithofacies transition surface and volcanic event interface, and the sedimentary system includes carbonate platform sedimentary system and shallow sea shelf depositional system. With the sedimentary facies of the Triassic strata and the integration of the tectonic setting of the Triassic strata, the Youjiang basin is considered to be the product of the Indo branch movement. It is a complex basin under the action of the ancient Tethys structure and the shore Pacific structure, which experienced the stage of the intracontinental rift basin from the late Silurian period to the passive marginal rift. The basin - back arc rift basin - foreland basin stage is affected by the process of backfilling and extinction, and its shallow sea platform is constantly disappearing and finally receives the filling of terrigenous sediments.

【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P534.51;P548

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