鄂尔多斯盆地西缘南北向断裂的发育及其地质意义

DEVELOPMENT OF THE NS FAULTS ON THE WESTERN MARGIN OF THE ORDOS BASIN AND ITS GEOLOGIAL SIGNIFICANCE

张庆龙 解国爱 任文军 袁玉珍 肖文霞 郭令智

ZHANG Qinglong XIE Guoai REN Wenjun YUAN Yuzhen XIAO Wenxia GUO Lingzhi

南京大学, 地科系, 江苏, 南京, 210093 2. 长庆石油勘探局, 宁夏, 吴忠, 751104

Department of Earth Sciences, Nanjing University, Nanjing, Jiangsu 210093, China 2. Changqing Petroleum Exploration Bureau, Wuzhong, Ningxia 751104, China

该文对鄂尔多斯盆地西缘断裂带中最重要的一条断裂,即青铜峡—固原断裂的几何学、运动学和动力学特征进行了综合研究,认为该断裂带上出露的辉绿岩属于"构造冷侵位"。断裂带两侧在石炭—二叠纪之前有各自不同的地质发展史,三叠纪后断裂带两侧沉积环境基本一致,说明了该断裂为不同地体的碰撞拼贴带。青铜峡—固原断裂带对其西侧的祁连造山带和东侧的鄂尔多斯盆地中央古隆起的形成均起着重要的控制作用。

The geometrical,kinematical and dynamical characteristics of the Qingtongxia Guguan Fault,a most important fault of the fault zone on the western margin of the Ordos Basin,were studied comprehensively in this paper.It is considered that the diabase outcropped in the fault zone belongs to "tectonic cool emplacement".The two sides of the fault zone have different geological development history of their own before the Carboniferous Permian period,and the sedimentary environment of the two sides is identical on the whole after the Triassic.It is suggested that the fault should be the collision-and-matching zone of different terranes.The Qingtongxia Guyuan fault zone plays an important controlling role in the formation of the Qilian Orogenic Belt on its western side and the Central Paleouplift of the Ordos Basin on its eastern side.

高等学校博士学科点专项科研基金课题(1999028437).

https://doi.org/10.11781/sysydz200202119