本文選題：桌子山地區(qū) + 中-新生代��； 參考：《西北大學(xué)》2015年碩士論文

【摘要】：桌子山地區(qū)位于鄂爾多斯盆地西北部,該地區(qū)為鄂爾多斯盆地構(gòu)造隆升研究較為薄弱的地方。桌子山地區(qū)中-新生代出露地層較全,巖性以砂巖為主。該區(qū)自中-新生代以來不同時期受不同構(gòu)造運動的影響較為強烈。區(qū)內(nèi)斷層、褶皺構(gòu)造發(fā)育,且構(gòu)造線呈近南北向展布。逆沖構(gòu)造為該區(qū)最大的構(gòu)造特點,且逆沖構(gòu)造多為斷層所破壞。根據(jù)區(qū)內(nèi)地層接觸關(guān)系、地震剖面結(jié)構(gòu)、構(gòu)造變形特征等可以看出區(qū)內(nèi)部分地層之間出現(xiàn)平行不整合甚至角度不整合,地層不同程度的遭受到剝蝕。從桌子山地區(qū)的裂變徑跡數(shù)據(jù)可以得出,該區(qū)自三疊紀以來主要經(jīng)歷了以下三個時期的快速隆升階段：晚侏羅世-早白堊世(155Ma-110Ma)、晚白堊世晚期-古近紀早期(85Ma-45Ma)和新近紀以來(20Ma-OMa)。桌子山東麓斷裂東西兩側(cè)的樣品新近紀以來的隆升速率有一定差異,表明桌子山東麓地區(qū)可能存在差異隆升過程。磷灰石裂變徑跡熱演化史模擬可知桌子山地區(qū)中-新生代的隆升剝蝕量可達3000余米。該區(qū)地層的隆升剝蝕對應(yīng)于一定的構(gòu)造事件。桌子山地區(qū)自晚三疊世以來便受構(gòu)造活動的強烈影響。晚三疊世受印支運動的影響,桌子山地區(qū)逐步結(jié)束了內(nèi)陸坳陷環(huán)境,局部地區(qū)開始遭受剝蝕。早-中侏羅世桌子山地區(qū)處于弱拉張環(huán)境,接受一定范圍的沉積。晚侏羅世,桌子山地區(qū)開始強烈隆升,并且主要斷裂基本形成。侏羅紀隆升剝蝕量可達700m左右。早白堊世隆升速率減小,到了晚白堊世直至古近紀早期,該區(qū)強烈隆升,且構(gòu)造變形作用進一步加強,褶皺、斷裂構(gòu)造基本形成,面貌已接近現(xiàn)今,白堊紀隆升剝蝕量達到1100m左右。新生代以來桌子山地區(qū)受喜馬拉雅運動的影響而進一步抬升,特別是自上新世以來該區(qū)發(fā)生了快速隆升,剝蝕量可達1300m左右。桌子山地區(qū)中-新生代以來受周圍多個塊體的聯(lián)合影響,這些塊體的綜合作用鑄就了該區(qū)復(fù)雜的應(yīng)力環(huán)境,這是該區(qū)構(gòu)造現(xiàn)象復(fù)雜的根源。桌子山地區(qū)不同時期的隆升與區(qū)域構(gòu)造活動密切相關(guān),受控于一定的深部地球動力學(xué)環(huán)境。
[Abstract]:The Tabaoshan area is located in the northwest of Ordos Basin, where the study of structural uplift in Ordos Basin is weak. Mesozoic-Cenozoic outcrop strata are relatively complete and sandstone is the main lithology in Guoshan area. Since the Mesozoic-Cenozoic, the area has been strongly influenced by different tectonic movements in different periods. In this area, the fault, fold structure is developed, and the tectonic line is distributed in the north-south direction. Thrust structure is the largest structural feature in this area, and the thrust structure is mostly destroyed by fault. According to the stratigraphic contact relationship, seismic profile structure and structural deformation characteristics, it can be seen that there are parallel unconformities or even angular unconformities among some strata in the region, and the strata are eroded to varying degrees. From the fission track data of the Taijiaoshan area, it can be concluded that the area has experienced three stages of rapid uplift since Triassic: late Jurassic-early Cretaceous (155Ma-110 Ma), late Cretaceous to early Paleogene (85 Ma-45 Ma) and Neogene (20 Ma-O Ma.). There are some differences in the uplift rates between the samples from the east and west sides of the table Shandong foot fault since the Neogene, which indicates that there may be a differential uplift process in the table-Shandong foothill area. The thermal evolution simulation of apatite fission track shows that the uplift and denudation amount of Mesozoic to Cenozoic can reach more than 3000 meters. The uplift and denudation of the strata in this area correspond to a certain tectonic event. The Taijiaoshan area has been strongly influenced by tectonic activity since the late Triassic. Due to the Indosinian movement in the late Triassic, the Taijiaoshan area gradually ended the inland depression environment, and the local area began to be eroded. The early-Middle Jurassic table mountain area is in a weak extensional environment and accepts a certain range of deposits. In the late Jurassic, the Taijiaoshan area began to uplift strongly, and the main faults were basically formed. The denudation amount of Jurassic uplift can reach about 700m. From the late Cretaceous to the early Paleogene, the uplift of the area was strong, the tectonic deformation was further strengthened, the fold and the fault structure were basically formed, and the appearance of the uplift was close to that of the present, and the uplift rate decreased in the early Cretaceous period until the early Paleogene. The Cretaceous uplift and denudation amount is about 1100m. Since the Cenozoic, the Taijiaoshan area has been further uplifted by the Himalayan movement, especially the rapid uplift occurred since the Pliocene, and the denudation amount can reach about 1300m. Since the Mesozoic to Cenozoic, the Taijiaoshan area has been influenced by several blocks around the area. The complex stress environment has been cast by the combined action of these blocks, which is the root of the complex tectonic phenomena in this area. Uplift in different periods is closely related to regional tectonic activity and is controlled by a certain deep geodynamic environment.
【學(xué)位授予單位】：西北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P542

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