吉林大学学报(地球科学版) ›› 2019, Vol. 49 ›› Issue (5): 1209-1221.doi: 10.13278/j.cnkij.juese.20180040
• 地质与资源 • 下一篇
杨庚, 陈竹新, 刘银河, 王晓波
Yang Geng, Chen Zhuxin, Liu Yinhe, Wang Xiaobo
摘要: 石油地震资料揭示塔里木盆地中央巴楚隆起为结晶基底和古生代地层相对隆升区,地表为第四纪陆相碎屑岩不整合覆盖,隐伏隆起大部分区域缺失中、新生界。在隆起南北两侧构造变形比较强烈,均发育基底卷入的逆冲构造和古生界内逆冲构造。根据钻井资料和二维地震测线详细的构造解释,应用断层相关褶皱理论得知:吐木休克基底卷入逆冲断层是在中生界早期形成的基底卷入楔形构造的基础上,在新生界晚期再次活动形成的;新生代晚期中亚地区强烈陆内变形,导致塔里木盆地先期形成的巴楚隆起再次挤压隆升;晚期变形过程中,先存构造与形成新构造挤压方向的偏差导致新构造发育有走滑分量,形成典型的斜向挤压构造——吐木休克旋转弧形构造。平面分布上,弧形构造东西向延伸的中段和北东向延伸的西段,早期为基底卷入楔形构造,晚期发育基底卷入逆冲构造;近北西向延伸的东段,晚期发育基底卷入楔形构造叠加在早期基底卷入楔形构造之上,说明该构造至少经历了两期变形。由于晚期基底卷入逆冲断层具有走滑分量,导致盖层单斜构造发育3类应变带及相应构造:拉伸变形带发育的正断层、剪切变形带发育的走滑断层及挤压应变带即走滑构造分量;西段发育左行逆冲走滑断裂带及伸展变形;东段发育右行逆冲走滑断裂带。弧形构造西部发育的构造样式与2012年Keating等模拟的斜向断层位移形成的构造样式非常相似,说明弧形构造西段吐木休克基底卷入逆冲构造具有走滑分量,从而合理地解释了该区发育的构造样式及正断层形成机制。
中图分类号:
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