Structural characteristics and active ages of the Gudongshan fault belt in Bachu uplift, Tarim Basin

Yang Yong; Tang Liangjie; Yue Shujuan; Huang Taizhu; Yun Lu; Xie Daqing

doi:10.11743/ogg20140114

Views : 0 下载量: 512 CSCD: 0

PDF
Export
Share
Collection
Album

Structural characteristics and active ages of the Gudongshan fault belt in Bachu uplift, Tarim Basin
Vol. 35, Issue 1, Pages: 116-123(2014)
Online First：08 February 2014，

Published：2014
DOI： 10.11743/ogg20140114
稿件说明：

移动端阅览

DOI：

Yang Yong, Tang Liangjie, Yue Shujuan, et al. Structural characteristics and active ages of the Gudongshan fault belt in Bachu uplift, Tarim Basin[J]. 2014, 35(1): 116-123. DOI： 10.11743/ogg20140114.

摘要

根据二维地震资料解释成果，利用构造解析方法建立了塔里木盆地古董山断裂带的几何学模型，确定了断裂主要活动时代。古董山断裂带构造变形复杂，其形成演化过程与塔里木盆地周缘洋盆和造山带的演化密切相关，在加里东中期、海西早期、海西中期、喜马拉雅早期和晚期等关键变革期均发生了明显的断裂活动。古董山1号和2号断层控制断裂带两侧古生代地层的厚度变化，具有多期活动特征。古董山1号断层活动时间是加里东中期Ⅰ幕和Ⅲ幕，并具有持续增强的特征。古董山2号断层形成于海西早期，之后在石炭纪、古近纪末分别经历了负反转、正反转的过程。古董山3号控制了断裂带两侧前寒武系基底南西高北东低的构造格局，形成于喜马拉雅早期。古董山4号和5号断层形成于喜马拉雅晚期，其中古董山4号断层的逆冲推覆距离达20 km，强烈的剥蚀作用导致其上盘残留地层表现为一个单斜的构造形态。

Abstract

2-D seismic data interpretation combined with structural analysis was used to build a geometry model and determine active ages of the Gudongshan fault belt.The formation and evolution of this fault belt with complicated tectonic deformation may be closely related to the evolution of oceanic basins and orogenic belts around Tarim Basin.Faulting activities were the most obvious in key tectonic periods of Tarim Basin

namely the Middle Caledonian

Early Hercynian

Middle Hercynian

Early Himalayan and Later Himalayan.Faults No.1 and No.2 in the Gudongshan fault belt control the thickness of the Palaeozoic strata on both sides of the belt and also show signs of multiple-stage activities.Fault No.1 was active during phase Ⅰ and Ⅲ of the Middle Caledonian and shows feature of progress intensification of its activity.Fault No.2 was developed in the Early Hercynian and successively experienced negative inversion in the Carboniferous and positive inversion at the end of Paleogene.Fault No.3 was formed in the Early Himalayan and controlled the tectonic framework of the Precambrian basement which is higher in southwest and lower in northeast.Faults No.4 and No.5 were developed in the Later Himalayan.The former has a thrust displacement up to 20 km and a denudation-caused monocline at the hanging wall.