本文選題：馬家灘構(gòu)造區(qū)帶 + 平衡剖面�。� 參考：《西北大學(xué)》2017年碩士論文

【摘要】：馬家灘構(gòu)造區(qū)帶位于賀蘭—銀川伸展構(gòu)造系、六盤山?jīng)_斷構(gòu)造系以及鄂爾多斯地塊之間,處于極其特殊的構(gòu)造位置,其形成演化是與周圍各構(gòu)造單元相互作用的結(jié)果,對馬家灘構(gòu)造區(qū)帶形成演化機(jī)制的研究具有重要的區(qū)域構(gòu)造意義。前人在馬家灘構(gòu)造區(qū)帶取得了許多成果及認(rèn)識,其大型滑脫面之上的逆沖推覆構(gòu)造樣式已經(jīng)得到多數(shù)學(xué)者的認(rèn)可,但對其形成演化機(jī)制尚不清楚,需要進(jìn)一步的深入研究。為了認(rèn)識馬家灘構(gòu)造區(qū)帶的形成演化機(jī)制,首先通過馬家灘構(gòu)造區(qū)帶及鄰區(qū)印支期以來主要不整合面的分析,結(jié)合前人低溫?zé)崮甏鷮W(xué)、沉積學(xué)等方面的研究成果,限定了馬家灘構(gòu)造區(qū)帶及鄰區(qū)主要構(gòu)造變形的發(fā)生時間。然后對穿過馬家灘構(gòu)造區(qū)帶的四條地震剖面進(jìn)行時深轉(zhuǎn)換、剝蝕量恢復(fù)及平衡剖面反演模擬,分析出了馬家灘構(gòu)造區(qū)帶的構(gòu)造演化過程,并在此過程中統(tǒng)計了各地層的縮短量和縮短率。通過對馬家灘構(gòu)造區(qū)帶反演模擬的綜合分析,對其形成演化機(jī)制取得以下幾點(diǎn)認(rèn)識:(1)馬家灘構(gòu)造區(qū)帶的北部和南部屬于不同類型的構(gòu)造樣式及成因類型,北部主要受到賀蘭—銀川構(gòu)造系的影響和控制而形成變形并不劇烈的斷裂褶皺構(gòu)造,可能為逆沖推覆構(gòu)造的雛形;南部主要受到六盤構(gòu)造系的影響和控制,形成明顯的逆沖推覆構(gòu)造。(2)馬家灘構(gòu)造區(qū)帶的石炭系—二疊系存在大型滑脫面,構(gòu)造變形主要發(fā)生于滑脫面以上地層中,下部地層在滑脫過程中變形程度很小。(3)印支運(yùn)動對馬家灘構(gòu)造區(qū)帶的影響不是很強(qiáng)烈,主要表現(xiàn)為輕微的褶皺作用為主,并伴隨有先存古老斷裂的微弱活動。(4)馬家灘構(gòu)造區(qū)帶的現(xiàn)今構(gòu)造樣式主要形成于燕山期—喜馬拉雅期,燕山期中后期奠定大體構(gòu)造格局,喜山期使之進(jìn)一步發(fā)展,構(gòu)造變形的主幕開始于侏羅紀(jì)末。
[Abstract]:The Majiatan tectonic belt is located between Helan-Yinchuan extensional tectonic system, Liupanshan thrust tectonic system and Ordos massif, and is located in a very special tectonic position. The formation and evolution of Majiatan tectonic zone is the result of interaction with the surrounding tectonic units. The study of the formation and evolution mechanism of the Majiatan tectonic zone has important regional tectonic significance. Many achievements and understandings have been made in the Majiatan structural zone. The thrust nappe structure style above the large slip surface has been recognized by most scholars, but the mechanism of its formation and evolution is still unclear and needs further study. In order to understand the mechanism of formation and evolution of the Majiatan structural belt, the main unconformities since the Indosinian period in the Majiatan tectonic zone and its adjacent areas were analyzed, and the results of previous studies in low-temperature thermal chronology and sedimentology were combined. The occurrence time of the main tectonic deformation in the Majiatan structural zone and adjacent area is limited. Then, four seismic sections passing through the Majiatan structural zone are simulated with time-depth conversion, denudation recovery and balanced section inversion, and the tectonic evolution process of the Majiatan structural zone is analyzed. In the process, the shortening and shortening rate of each layer are counted. Based on the comprehensive analysis of the inversion simulation of the Majiatan tectonic zone, the formation and evolution mechanism of the Majiatan tectonic zone is analyzed. The following points are obtained: the northern and southern parts of the Majiatan tectonic zone belong to different types of structural styles and genetic types. The northern part was mainly influenced and controlled by the Helan-Yinchuan tectonic system and formed a fault-fold structure which was not severely deformed, which may be the embryonic form of the thrust-nappe structure, while the southern part was mainly influenced and controlled by the six-plate tectonic system. The Carboniferous to Permian system in the Majiatan structural zone has a large detachment surface, and the structural deformation mainly occurs in the strata above the slip surface. The influence of the Indosinian movement on the Majiatan tectonic zone is not very strong, but mainly shows the slight fold action. The present tectonic style of the Majiatan tectonic zone was mainly formed in the Yanshanian and Himalayan periods, and the general tectonic framework was laid down in the middle and late Yanshanian period, which was further developed during the Himalayan period. The main curtain of tectonic deformation began at the end of Jurassic.
【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】：2017
【分類號】：P618.13
，

本文編號：2014657