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重力异常资料显示,库车坳陷南缘西秋构造带深层发育有基底隆起。本文通过地震资料解释确认了西秋构造带深层占隆起的结构,分析了占隆起的形成和演化过程。西秋构造带南侧边缘存在一条区域性基底断裂,断裂北侧新生界下伏中生界、古生界明显减薄或地层缺失,总体上表现为断背斜形态的古隆起构造。结合区域构造演化分析认为,泥盆纪~石炭纪(D-C)塔里木克拉通边缘隆升、二叠纪-三叠纪(P-T)受南天山负荷影响产生的克拉通边缘压陷的构造演化过程中,西秋构造带处于“跷跷板”式地壳升降运动的“支点”部位,发育古隆起和基底卷入高角度断层,晚期南天山隆升向南斜向推挤的挤压剪切应力场使古隆起边界断层复活,基底断裂活动并在新生界之下形成冲断隆起。
Abnormal gravity data show that the Qiku tectonic belt in the southern margin of the Kuqa depression has a basement uplift. In this paper, we confirm the deep uplift structure of the Xiqiu tectonic belt through the interpretation of seismic data, and analyze the formation and evolution of the uplift. There is a regional basement fault on the southern margin of the Xikuang structural belt. The Mesozoic, Mesozoic thinning or stratigraphic subsidence in the northern Cenozoic of the fault north is generally manifested as a paleo-uplift structure with a faulted anticline. Based on the analysis of regional tectonic evolution, it is suggested that during the tectonic evolution of the margin of the Craton across the margin of the Devonian-Carboniferous (DC) Tarim uplift, Permian-Triassic (PT) , The western Qiu tectonic belt is located at the “fulcrum” of the “seesaw” type crustal ascending and descending movement, with developed paleo-uplift and basal involvement in high-angle faults. In the late stage, the southern Tianshan uplift is extruded obliquely southward The stress field revitalizes the paleo-uplift boundary fault and basal faults and forms a thrust uplift beneath the Cenozoic.