本文選題：遼西南部 + 構(gòu)造變形序列�。� 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：遼西南部建昌藥王廟一帶,處于燕山造山帶的冀北-冀東地區(qū)近EW向構(gòu)造帶與遼西地區(qū)NE向構(gòu)造帶的轉(zhuǎn)折部位的東端,這就涉及到古亞洲洋構(gòu)造體系和古太平洋構(gòu)造體系,雖然前人對(duì)于這兩種構(gòu)造體系之間相互疊加、轉(zhuǎn)換的過(guò)程和方式已經(jīng)有了深入細(xì)致的研究,但是依然缺少包括研究區(qū)在內(nèi)的一些關(guān)鍵區(qū)域的詳細(xì)構(gòu)造變形解析,對(duì)于研究區(qū)及周圍的變形研究工作非常有限,因此,有必要對(duì)研究區(qū)進(jìn)行構(gòu)造變形方面的研究,從而為討論兩種構(gòu)造體系之間的關(guān)系提供區(qū)域研究的基礎(chǔ)。我們?cè)谘芯繀^(qū)進(jìn)行了詳細(xì)的野外地質(zhì)調(diào)查以及相應(yīng)的室內(nèi)數(shù)據(jù)分析與研究,確定了研究區(qū)中生代時(shí)期發(fā)育的主要構(gòu)造形跡的幾何學(xué)、運(yùn)動(dòng)學(xué)特征,并結(jié)合了變形年代學(xué)方面的研究和古構(gòu)造應(yīng)力場(chǎng)方面的分析,將研究區(qū)主要構(gòu)造變形的形成序列劃分如下:D1、近EW向展布的斷裂和褶皺構(gòu)造近EW向構(gòu)造,是研究區(qū)內(nèi)第一期構(gòu)造變形,主要表現(xiàn)為上盤指向南的逆沖以及一系列近EW向展布的褶皺構(gòu)造。這期構(gòu)造的形成時(shí)代在早侏羅世之前,處于近SN向的擠壓應(yīng)力場(chǎng)中。D2、NE向逆沖斷層及褶皺構(gòu)造這期NE向斷裂構(gòu)造與褶皺構(gòu)造形成于晚侏羅世至早白堊世初。這一時(shí)期,在NW-SE向擠壓應(yīng)力場(chǎng)的作用下,形成了NE走向、逆沖指向SE的逆沖斷層以及相關(guān)褶皺構(gòu)造,在研究區(qū)內(nèi)以韓家屯-前營(yíng)子斷層及吳家屯背斜為代表。在此之后,沿韓家屯-前營(yíng)子斷層的主斷層面,斷層在NW-SE向伸展應(yīng)力場(chǎng)和NE-SW向擠壓應(yīng)力場(chǎng)的作用下,先后發(fā)生了伸展活動(dòng)和右行走滑運(yùn)動(dòng)。D3、NNE向左行走滑構(gòu)造系統(tǒng)第三期構(gòu)造是NNE向左行走滑構(gòu)造系統(tǒng),以發(fā)育于藥王廟南部的大規(guī)模左行走滑構(gòu)造系統(tǒng)為代表,多條左行走滑斷層在平面上呈左行左階的排列組合型式,形成時(shí)代在晚白堊世時(shí)期。它的形成與區(qū)域上的郯廬斷裂系具有一致性,受到區(qū)域上NW-SE向擠壓應(yīng)力場(chǎng)的影響,表明與太平洋板塊向NW-NNW俯沖于東亞大陸之下有關(guān)。
[Abstract]:The Yawangmiao area of Jianchang in southwestern Liaoning is located in the eastern end of the EW-trending tectonic belt near the Yanshanian orogenic belt and the NE trending tectonic belt in western Liaoning, which involves the paleo-Asian oceanic tectonic system and the paleo-Pacific tectonic system. Although the previous studies on the superposition and transformation between the two tectonic systems have been deeply and meticulously studied, there is still a lack of detailed structural deformation analysis in some key areas, including the study area. The research work on deformation in and around the study area is very limited. Therefore, it is necessary to study the tectonic deformation in the study area, so as to provide a basis for regional research on the relationship between the two tectonic systems. We carried out detailed field geological survey and related indoor data analysis and research in the study area, and determined the geometric and kinematic characteristics of the main tectonic traces developed during the Mesozoic in the study area. Combined with the study of deformation chronology and the analysis of paleotectonic stress field, the formation sequence of the main tectonic deformation in the study area is divided as follows: 1. The near EW trending faults and fold structures are near EW trending structures. It is the first tectonic deformation in the study area, mainly characterized by thrusts pointing to the south of the upper face and a series of fold structures near the EW direction. Before the early Jurassic, the tectonic formation of this period was in the compressional stress field of near SN direction. D2NE-trending thrust faults and fold structures were formed from late Jurassic to early Cretaceous. During this period, the NE strike, thrust pointing to SE thrust faults and related fold structures were formed under the action of NW-SE compressive stress field, represented by Hanjiatun-Qianying Zi fault and Wujiatun anticline in the study area. After this, along the main fault plane of Hanjiatun-Qianying Zi fault, the fault is under the action of NW-SE extensional stress field and NE-SW compressive stress field. The third stage of the extensional movement and the right-lateral strike-slip movement .D3NNE-left strike-slip system is the NNE left strike-slip tectonic system, represented by the large-scale left strike-slip tectonic system developed in the south of Jawangmiao. Many left strike-slip faults were arranged and combined in the left row and left order on the plane, forming in the late Cretaceous. Its formation is consistent with the Tan-Lu fault system in the region and is influenced by the compression stress field in the NW-SE direction in the region, indicating that the Pacific plate subducts under the East Asian continent towards the NW-NNW plate.
【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)】：P542

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