本文選題：天山 + 北輪臺斷裂��； 參考：《新疆大學(xué)》2015年碩士論文

【摘要】：天山是歐亞大陸內(nèi)部最大的一條造山帶(Avouce et al.,1993;Hendrix et al.,1994;鄧起東等)�，F(xiàn)如今對于天山的統(tǒng)一認(rèn)識為:第四紀(jì)以來,天山的構(gòu)造活動主要以山前、山間盆地邊緣的逆沖推覆為主,如北天山山前的推覆構(gòu)造體(Avouce et al.,1993;鄧起東等,2000)、南天山山前的庫車坳陷(馮先岳等,1991)和柯坪推覆構(gòu)造(Yin et al.,1998)等。本文主要研究了位于新疆天山南麓山前庫車坳陷東側(cè)的北輪臺斷裂。該斷裂全長超過300km,晚第四紀(jì)以來活動強(qiáng)烈,控制著塔里木盆地北緣中、新生代地層分布,沿斷裂多處可見到古生界地層逆沖至中、新生界地層之上,局部有切割全新統(tǒng)現(xiàn)象,是一個長期繼承性活動斷裂帶。沿斷裂多處分布有清晰的古地震形變帶,顯示出該斷裂具有強(qiáng)烈的活動性。由于該斷裂距離庫爾勒市僅10公里左右,對庫爾勒市的發(fā)展規(guī)劃產(chǎn)生了影響,且該活動斷層可能對周圍城市庫爾楚市造成地震災(zāi)害。為此本論文通過遙感解譯法、地貌學(xué)方法、探槽方法和年代學(xué)方法等對該斷裂幾何特征、地質(zhì)地貌特征和典型段古地震特征進(jìn)行了初步的研究。通過研究我們得到了以下結(jié)論:1.北輪臺斷裂位于新疆南天山與塔里木盆地之間,逆沖推覆是其最主要的構(gòu)造變形方式之一。該斷裂整體呈現(xiàn)NWW—EW向展布,全長約300km,斷層面傾向N,傾角50~80°沿斷裂不僅形成了典型的斷錯地貌特征,而且還存在多期古地震事件。2.北輪臺斷裂從西向東分為5個較大的自然不連續(xù)段落:拉依布拉克至野云溝段(130km)、野云溝至阿克艾肯溝段(50km)、庫爾楚至吉格代布拉克段(40km)、吉格代布拉克至庫爾勒段(20km)以及庫爾楚至鐵門關(guān)水庫段(100km)。3.通過微地貌測量、斷層陡坎地形測量,以及探槽剖面研究分析我們發(fā)現(xiàn)在喀臘薩喀拉阿塔木溝探槽附近至少發(fā)生過三次大型古地震事件,其時間均位于晚第四紀(jì)。4.在庫爾勒西帝禾農(nóng)業(yè)探槽附近,我們通過地質(zhì)地貌特征的研究和探槽剖面的分析發(fā)現(xiàn)該區(qū)域至少發(fā)生過兩次大型古地震事件。
[Abstract]:Tianshan is the largest orogenic belt in Eurasia, (Avouce et al.1993, Hendrix et al. 1994; Deng Qidong et al. Nowadays, the unified understanding of Tianshan is that since the Quaternary, the tectonic activities of Tianshan are mainly in the front of mountains and the thrust and nappe in the margin of intermountain basins. For example, the nappe tectonics in front of North Tianshan Mountain, (Avouce et al. 1993; Deng Qidong et al., 2000), Kuqa Depression in front of South Tianshan Mountain (Feng Xianyue et al. 1991) and Keping nappe structure (Yin et al., 1998), etc. In this paper, the north Luntai fault located at the east side of Kuqa depression at the south foot of Tianshan Mountain, Xinjiang is studied. The fault is over 300km in length and has been active since the late Quaternary, controlling the distribution of Mesozoic and Cenozoic strata in the northern margin of the Tarim Basin. Along the fault, the Paleozoic strata can be seen thrust to the Mesozoic and the Cenozoic strata, and there is a phenomenon of cutting new series locally. It is a long-term inherited active fault zone. There are clear paleoseismic deformation zones along the fault, which shows that the fault has strong activity. Because the fault is only about 10 kilometers from Kurla City, it has an impact on the development planning of Kurla City, and the active fault may cause earthquake disaster to the surrounding city of Kurchu City. In this paper, the geometrical characteristics, geological features and paleoseismic characteristics of the fault are preliminarily studied by means of remote sensing interpretation, geomorphology, grooving and chronology. By studying, we get the following conclusion: 1. The north Luntai fault lies between the southern Tianshan mountain and the Tarim basin in Xinjiang, and the thrust and nappe is one of the main structural deformation modes. The whole fault is NWW-EW, with a total length of about 300 km. The fault plane inclines to N, and the dip angle of 5080 擄along the fault not only forms the typical fault-fault geomorphologic characteristics, but also has many paleoearthquake events. 2. The north Luntai fault is divided into five large natural discontinuities from west to east: from Raeblak to Yeyungou (130km), from Yeyungou to Akaiken gully (50km), from Kuerchu to Jigdebrak (40km), and from Jigdebrak to 20km. And Kulchou to Tienmen Guan Reservoir Section (100km). 3. By means of microgeomorphology survey, fault steep ridge topographic survey, and trough profile study, we found that at least three large paleoearthquakes occurred near the Kalasakaraamu grooves, all of which took place in the late Quaternary. Based on the study of geological and geomorphologic characteristics and the analysis of trench profiles, it is found that there were at least two large paleoearthquakes in the area near the Kulla Xidihe agricultural exploration trough.
【學(xué)位授予單位】：新疆大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P548;P315.2

【參考文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 史杰;新疆阜康斷裂晚第四紀(jì)活動性研究[D];中國地震局蘭州地震研究所;2011年

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本文編號：2058150