塔里木盆地北缘沙雅隆起两阶段走滑变形的证据

Evidence of two-stage strike-slip structural deformation of Shaya Uplift, northern Tarim Basin

何光玉 顾忆 赵永强 姚泽伟 郑晓丽 肖思东 黄继文 贾存善 周雨双

HE Guangyu GU Yi ZHAO Yongqiang YAO Zewei ZHENG Xiaoli XIAO Sidong HUANG Jiwen JIA Cunshan ZHOU Yushuang

浙江大学 地球科学学院, 杭州 310027 中国石化 石油勘探开发研究院 无锡石油地质研究所, 江苏 无锡 214126 浙江大学 海洋学院, 浙江 舟山 316021 东方地球物理公司, 新疆 库尔勒 841000 浙江国高能源科技有限公司, 杭州 310023

School of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang 310027, China Wuxi Research Institute of Petroleum Geology, SINOPEC, Wuxi, Jiangsu 214126, China Ocean College, Zhejiang University, Zhoushan, Zhejiang 316021, China BGP Inc, CNPC, Korla, Xinjiang 841000, China Zhejiang GOGA Energy Technology Company, Hangzhou, Zhejiang 310023, China

沙雅隆起（塔北隆起）是塔里木盆地北缘极为重要的近东西向构造带。前人研究认为，沙雅隆起以逆冲变形为主，但是，这一认识既与地震剖面上的花状构造样式相矛盾，又与平面图上断层呈扫帚状和拖尾状分布的特征相矛盾。该文基于高分辨率的三维地震剖面，提出塔里木盆地北缘沙雅隆起经历了2个阶段的走滑构造变形：第一阶段为加里东晚期—印支期的压扭构造变形，形成了深部构造层中的大型正花状构造，同时地层被大幅抬升并遭受剥蚀；第二阶段为喜马拉雅期的负反转—张扭构造变形，形成了浅部构造层中的负花状构造。这一认识表明，塔里木盆地北缘可能并非统一的构造—沉积环境，沙雅走滑构造带为一重要的构造—沉积分隔带，而加里东晚期与喜马拉雅早期是塔里木盆地北缘非常重要的2个构造变革期。

The Shaya Uplift, an important structural belt in the northern Tarim Basin, northwestern China, has been regarded as a thrust belt. However, this recognition is not only incompatible with the flower structures on the seismic profiles, but also contradictory with the fault distribution in a broom or trailer mode in plan view. High-resolution 3D seismic profiles indicate that a two-stage strike-slip structural deformation happened in the Shaya Uplift. The first is from the Late Caledonian to the Indosinian, in which transpressional deformation occurred and a huge positive flower structure was thus formed in the deeper part, and strata were eroded because of the structural uplifting. The second is during the Himalayan, in which a negative inverted/transtensional deformation occurred and a negative flower structure was formed in the shallower part. These results indicate that it is not a uniform tectonic-sedimentary environment in the northern Tarim because of the Shaya Uplift barrier and that the Late Caledonian and the Early Himalayan may be two important structural transformation periods.

国家“十三五”科技攻关项目 2017ZX05005002-002

https://doi.org/10.11781/sysydz202002172