鄂尔多斯盆地南部环形影像特征及地质意义

为了研究鄂尔多斯盆地中-新生代时期的演化,采用遥感技术与地球物理资料综合分析方法,对 CBERS和ETM+卫星影像的处理,在鄂尔多斯盆地南部发现直径大于300km的环形构造,环形中心位于甘肃 省东部的东华池附近。该环形构造内西部为西峰油田,中东部有古生界—中生界大型煤田,东南和西北部都有 铀矿的发现,4种能源矿产(石油、天然气、煤和铀)居于环中。地球物理和地震资料综合分析证明,该环形构造 为一相对独立的块体,其活动既有升降,又有旋转,受深部控制,主要是中—新生代造山作用(印支运动、燕山运 动和喜山运动)联合作用的结果,对多能源矿产同盆共存具有重要的控制作用。

Ring Structure in South Ordos Basin and Its Geologic Genesis

Through processing the CBERS and ETM+ satellite image, a ring structure which is about to 300 km in diameter was found in the southern Ordos basin. The center of the ring approximately locates at Donghuachi in the east of Gansu province. From the point of view of topography, the main body of the ring is plus-topography, except for the southeastern part of the ring. There are four energy source mineral deposits in the ring conforma- tion. The Xifeng oil field occurs in the western part of the ring structure, a large Mesozoic coalfield in the central- eastern, and uranium deposits both in southeastern and northwestern. It is testified that the ring has close corre- lation with deep-seated structure and dominated by the mantle plume in the deep of the earth through the compre- hensive study of physical geography and natural earthquake. It is the result of the united effects of the orogenic activities during Mesozoic to Cenozoic period(Indo-China movement, Yanshan movement, Himalayan movement). It acts as the interior power to the coexistence of multi-energy sources in the same basin. This cognition has a very important value to study mechanism of the formation of the craton basin and guide geological exploration.