【摘要】：榆木山北緣斷裂位于祁連山逆沖斷裂帶中部,是榆木山隆起與河西走廊之間的分界斷裂。探究榆木山北緣斷裂的構(gòu)造活動(dòng),有助于進(jìn)一步了解祁連山向N的擴(kuò)展過(guò)程以及青藏高原向NE方向推擠的機(jī)制。文中主要從斷層滑動(dòng)速率、古地震活動(dòng)習(xí)性和構(gòu)造變形3個(gè)方面總結(jié)了榆木山地區(qū)近20多年以來(lái)的研究成果。通過(guò)遙感影像解譯、野外地質(zhì)調(diào)查、斷錯(cuò)位移測(cè)量及地貌面年齡測(cè)定等方法和手段,估算了榆木山北緣斷裂典型位錯(cuò)點(diǎn)的逆沖滑動(dòng)速率為(0.55±0.15)mm/a;左旋滑動(dòng)速率為(0.95±0.11)mm/a。認(rèn)為前人提出的"駱駝城陡坎"并非斷層活動(dòng)的產(chǎn)物,而是古代引水工程或水利灌溉工程的遺跡,也就是說(shuō)它不是公元180年表氏地震的地表破裂。通過(guò)DEM剖面所反映的山體形態(tài),結(jié)合斷裂各項(xiàng)特征,認(rèn)為榆木山隆起是祁連山向N推擠的結(jié)果,斷裂活動(dòng)目前仍集中在榆木山北側(cè),山體的形態(tài)受斷層擴(kuò)展控制,山脈的擴(kuò)展是1個(gè)垂向和側(cè)向的過(guò)程,晚新生代以來(lái)榆木山持續(xù)隆升。
[Abstract]:The northern margin of Yumushan fault is located in the middle of Qilian Mountain thrust fault zone and is a boundary fault between Yumushan uplift and Hexi corridor. To explore the tectonic activity of the fault in the northern margin of Yumushan is helpful to further understand the extension process of the Qilian Mountains to N and the mechanism of the Qinghai-Xizang Plateau pushing in the direction of NE. In this paper, the research results in Yumushan area in recent 20 years are summarized from three aspects: fault slip rate, paleoseismic activity habits and structural deformation. By means of remote sensing image interpretation, field geological survey, fault dislocation displacement survey and geomorphological surface age determination, the thrust slip rate of typical dislocation points in the northern margin of Yumushan fault is estimated to be (0.55 鹵0.15) mm/a; and (0.95 鹵0.11) mm/a.. It is considered that the "camel city steep ridge" proposed by predecessors is not the product of fault activity, but the relic of ancient water diversion project or water conservancy and irrigation project, that is to say, it is not the surface rupture of the 180 AD Bei earthquake. Through the shape of mountain body reflected in DEM section and the characteristics of faults, it is considered that the Yumushan uplift is the result of N push and extrusion in Qilian Mountains, and the fault activity is still concentrated on the north side of Yumushan Mountains. The shape of the mountain body is controlled by fault expansion. The mountain range expansion is a vertical and lateral process. Yumushan uplift has continued to rise since the late Cenozoic.
【作者單位】： 中國(guó)地震局地質(zhì)研究所地震動(dòng)力學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室;中山大學(xué)地球科學(xué)與工程學(xué)院廣東省地球動(dòng)力作用與地質(zhì)災(zāi)害重點(diǎn)實(shí)驗(yàn)室;中國(guó)科學(xué)院地球環(huán)境研究所;牛津大學(xué)地球科學(xué)系;中國(guó)地震局蘭州地震研究所;
【基金】：國(guó)家自然科學(xué)基金(41590861,41372220,41172194) 公益性行業(yè)科研專(zhuān)項(xiàng)經(jīng)費(fèi)項(xiàng)目(201408023)共同資助
【分類(lèi)號(hào)】：P315.2

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