本文選題：川東南構(gòu)造帶 + 湘鄂西構(gòu)造帶��； 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2016年博士論文

【摘要】：雪峰山陸內(nèi)復(fù)合構(gòu)造系統(tǒng)是目前研究的熱點(diǎn)問題,而川東南-湘鄂西地區(qū)位于該系統(tǒng)的西界,對(duì)于川東南-湘鄂西地區(qū)的構(gòu)造特征和構(gòu)造演化的研究是深入研究雪峰山陸內(nèi)復(fù)合構(gòu)造系統(tǒng)的基礎(chǔ),同時(shí)川東南地區(qū)是油氣資源勘探的重點(diǎn)區(qū),研究其構(gòu)造特征和演化對(duì)油氣勘探有一定的指導(dǎo)作用。本文以構(gòu)造地質(zhì)學(xué)和斷層相關(guān)褶皺理論等為基礎(chǔ),綜合應(yīng)用野外地質(zhì)考察資料、地震剖面資料和鉆井資料,將野外實(shí)測(cè)剖面、淺表地質(zhì)剖面與地震剖面結(jié)合分析川東南構(gòu)造帶和湘鄂西構(gòu)造帶的構(gòu)造幾何學(xué)特征,并應(yīng)用運(yùn)動(dòng)學(xué)分析方法建立動(dòng)態(tài)的構(gòu)造運(yùn)動(dòng)學(xué)模型分析其構(gòu)造演化特征,探討川東南構(gòu)造帶與湘鄂西構(gòu)造帶的構(gòu)造關(guān)系。同時(shí)對(duì)野外采集的樣品進(jìn)行磷灰石裂變徑跡實(shí)驗(yàn)分析來進(jìn)一步厘定川東南地區(qū)的構(gòu)造變形時(shí)間。川東南褶皺帶及湘鄂西西北部在燕山期以來主要經(jīng)歷三次抬升:在約89Ma達(dá)到最大埋深并進(jìn)入緩慢抬升階段,在約28Ma進(jìn)入快速隆升階段,在約20Ma隆升速率減慢。川東南大部分地區(qū)白堊系及新生界的沉積都被剝蝕。川東南構(gòu)造帶劃分為四個(gè)褶皺帶,主要受4套滑脫層控制:基底前震旦系變質(zhì)巖滑脫層、深部寒武系泥頁巖和膏巖滑脫層、中部志留系泥頁巖滑脫層和淺部三疊系嘉陵江組膏巖滑脫層。四個(gè)褶皺帶的所有背斜的構(gòu)造均可劃分為淺層構(gòu)造層、中層構(gòu)造層、深層構(gòu)造層和基底構(gòu)造層。川東南構(gòu)造帶各層的縮短量不同,川東南地區(qū)空間收縮變形最大達(dá)到四分之一,最小為七分之一,大部分地區(qū)的空間收縮變形為六分之一到五分之一之間。四個(gè)褶皺帶的背斜構(gòu)造變形時(shí)間為晚白堊世-古近紀(jì)和新近紀(jì),構(gòu)造變形主要受到晚燕山運(yùn)動(dòng)和喜馬拉雅運(yùn)動(dòng)的影響。湘鄂西構(gòu)造帶垂向上主要發(fā)育三套滑脫層,分別是震旦系的滑脫層和前震旦系的兩套滑脫層。湘鄂西地區(qū)的向斜和背斜構(gòu)造的形成時(shí)間主要是加里東期-海西期和印支期。湘鄂西構(gòu)造帶褶皺形態(tài)為隔槽式褶皺形態(tài),而過渡帶褶皺形態(tài)為等寬箱狀褶皺形態(tài),川東南構(gòu)造帶褶皺形態(tài)為隔檔式褶皺形態(tài),這三個(gè)相鄰褶皺帶的褶皺形態(tài)為褶皺形態(tài)發(fā)展的不同形態(tài)階段。川東南地區(qū)存在著多期次多層滑脫變形的特征,川東南-湘鄂西地區(qū)處于雪峰山陸內(nèi)造山帶的逆沖推覆構(gòu)造帶,推覆構(gòu)造受到南東-北西向的水平擠壓作用下沿滑脫層滑動(dòng),從南東向北西發(fā)生遞進(jìn)衰減變形。
[Abstract]:The complex tectonic system in Xuefeng Mountain is a hot research topic at present, and the southeast of Sichuan and the western part of Hunan and Hubei are located in the western boundary of the system. The study of the structural characteristics and tectonic evolution in the southeast of Sichuan and the western part of Hunan and Hubei is the basis for the in-depth study of the complex structural system in the Xuefeng Mountains, and the southeast part of Sichuan is the key area for the exploration of oil and gas resources. The study of its structural characteristics and evolution has a certain guiding role for oil and gas exploration. On the basis of tectonic geology and fault-related fold theory, this paper synthetically applies field geological survey data, seismic profile data and drilling data. The structural geometry characteristics of the southeastern Sichuan tectonic belt and the western Hunan Hubei tectonic belt are analyzed in combination with the shallow geological profile and the seismic section, and the dynamic tectonic kinematics model is established to analyze the tectonic evolution characteristics by using the kinematics analysis method. The structural relationship between the southeast Sichuan tectonic belt and the western Hunan-Hubei tectonic belt is discussed. At the same time, the fission track analysis of apatite was carried out to determine the tectonic deformation time of southeast Sichuan. Since the Yanshanian period, the southeast Sichuan fold belt and the northwest of Hunan and Hubei mainly experienced three uplifts: at about 89Ma reaching the maximum buried depth and entering the stage of slow uplift, at about 28Ma entering the stage of rapid uplift, and at about 20Ma, the rate of uplift slowed down. The Cretaceous and Cenozoic deposits in most parts of southeast Sichuan were denudated. The southeast Sichuan tectonic belt is divided into four fold zones, which are mainly controlled by four sets of slip beds: basement Psinian metamorphic detachment, deep Cambrian mudstone and gypsum detachment. The central Silurian shale slippage layer and shallow Triassic Jialingjiang formation gypsum detachment layer. All the anticlines in the four fold belts can be divided into shallow layer, middle layer, deep layer and basement layer. The shortening of each layer in the southeast Sichuan tectonic belt is different. The spatial shrinkage deformation of southeast Sichuan is 1/4, the minimum is 1/7, and the shrinkage deformation of most areas is between 1/6 and 1/5. The anticline tectonic deformation of the four fold belts occurred in the late Cretaceous Paleogene and Neogene. The tectonic deformation was mainly influenced by the late Yanshanian and Himalayan movements. There are three sets of slip layers mainly developed in the vertical direction of the western Hunan and Hubei tectonic belt, which are the slippage layers of the Sinian system and the two sets of slippage layers of the pre-Sinian system. The formation time of syncline and anticline in the west of Hunan and Hubei is mainly Caledonian-Hercynian and Indosinian. The fold form of Xiang-Hubei structural belt is secluded fold form, while that of transitional zone is equal-width box fold form, and that of southeast Sichuan structural belt is separated fold form. The fold morphology of the three adjacent fold zones is different morphological stages of fold morphology development. There are many times and multiple layers of slip deformations in southeast Sichuan. The southeast Sichuan-Xiang-Hubei area is located in the thrust nappe tectonic belt of the Xuefengshan intracontinental orogenic belt, and the nappe structure is sliding along the slip layer under the action of horizontal compression in the south-east-northwest direction. Progressive attenuation deformation occurs from south to east to north and west.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2016
【分類號(hào)】：P542

【參考文獻(xiàn)】

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1 郝天珧;胡衛(wèi)劍;邢健;胡立天;徐亞;秦靜欣;劉少華;雷受e，

本文編號(hào)：1882298