【摘要】：本文以陜西省地震局所承接的《關(guān)中大震危險(xiǎn)性評(píng)價(jià)》項(xiàng)目為依托,對(duì)口鎮(zhèn)—關(guān)山斷裂活動(dòng)性進(jìn)行綜合研究�？阪�(zhèn)—關(guān)山斷裂是渭河盆地北緣一條重要的邊界斷裂,是渭河盆地北緣與鄂爾多斯地塊南緣的構(gòu)造分界線。斷裂的活動(dòng)性控制盆地及周圍構(gòu)造單元的發(fā)育演化,同時(shí)斷裂活動(dòng)會(huì)影響盆地穩(wěn)定性,引發(fā)地震等次生災(zāi)害,從而造成生命安全問題與城市破壞,所以對(duì)斷裂活動(dòng)性的研究具有重要的科學(xué)意義與現(xiàn)實(shí)意義。本次研究結(jié)合前人研究成果與區(qū)域構(gòu)造背景,對(duì)口鎮(zhèn)—關(guān)山斷裂地形地貌與露頭剖面進(jìn)行了詳細(xì)踏勘,并在斷裂面采集碎裂巖定向標(biāo)本,磨制薄片并開展斷層碎裂巖顯微構(gòu)造觀察分析,綜合分析解釋斷裂構(gòu)造演化與活動(dòng)期次。同時(shí)對(duì)斷裂進(jìn)行了鉆孔聯(lián)合剖面分析,提供研究斷裂幾何學(xué)與運(yùn)動(dòng)學(xué)特征的證據(jù),再根據(jù)高分辨地震折射剖面與跨斷層水準(zhǔn)測(cè)量得到斷裂基底延伸特征和近年垂直活動(dòng)速率。綜合分析認(rèn)為：口鎮(zhèn)—關(guān)山斷裂區(qū)域上經(jīng)歷先期擠壓性質(zhì)的構(gòu)造作用,可能包括古老的加里東期、燕山期構(gòu)造作用；在此基礎(chǔ)上又經(jīng)歷了喜山期拉張作用,新老構(gòu)造疊加改造形成了現(xiàn)今的口鎮(zhèn)—關(guān)山斷裂。受到印度洋板塊與太平洋板塊運(yùn)動(dòng)遠(yuǎn)程效應(yīng)影響,鄂爾多斯地塊具有左旋運(yùn)動(dòng)性質(zhì),口鎮(zhèn)—關(guān)山斷裂現(xiàn)今仍處在持續(xù)拉張背景下,并且斷裂活動(dòng)性具有西強(qiáng)東弱的特征。近年來東部活動(dòng)性有增強(qiáng)趨勢(shì),因此斷裂在未來具有引發(fā)有感地震或中震的可能性。
[Abstract]:Based on the project of Guanzhong earthquake risk Assessment undertaken by Shaanxi Seismological Bureau, this paper makes a comprehensive study on the activity of the Zhenzhou-Guanshan fault. Kouzhen-Guanshan fault is an important boundary fault in the north margin of Weihe basin and the structural boundary between the north margin of Weihe basin and the southern margin of Ordos block. The activity of the fault controls the development and evolution of the basin and its surrounding tectonic units. At the same time, the activity of the fault will affect the stability of the basin, cause secondary disasters such as earthquakes, and thus lead to life safety problems and urban destruction. Therefore, the study of fault activity has important scientific and practical significance. Combined with the previous research results and regional tectonic background, the topographic and geomorphological features and outcrop sections of the Zhenzhou-Guanshan fault have been investigated in detail, and the directional specimens of clastic rocks have been collected on the fault surface. The microstructures of faulted clastic rocks were observed and analyzed to explain the evolution and active stages of fault structures. At the same time, the fracture joint section is analyzed, which provides evidence for studying the geometric and kinematic characteristics of the fault. The extension characteristics of the fault basement and the vertical activity rate in recent years are obtained according to the high-resolution seismic refraction profile and the cross-fault leveling. The comprehensive analysis shows that the Kou Zhen-Guanshan fault area experienced a pre-compressional tectonic process, which may include the ancient Caledonian and Yanshanian tectonics, and on this basis experienced the Himalayan extensional process. The new and old structures were superimposed to form the present-day Kou Zhen-Guanshan fault. Influenced by the remote effect of the Indian Ocean plate and the Pacific plate movement, the Ordos block has the property of left-handed movement, and the Kou Zhen-Guanshan fault is still in the continuous extensional background, and the fault activity is characterized by the west strong and the east weak. In recent years, there is an increasing trend of activity in the eastern part of China, so the fault has the possibility of triggering a felt earthquake or a moderate earthquake in the future.
【學(xué)位授予單位】：西北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P315.2

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本文編號(hào)：2128333