武当山北部南化塘地区地质构造演化过程

本文据1：5万南化塘幅成果，主要论述了该地区的地质构造演化过程。指出该区经历了两次重要的构造变动．一次是晋宁运动，造成武当山岩群与耀岭河组之间的不整合接触；另一次是晚海西一印支期的伸展滑晚构造，它包括两个重要的变形阶段：早期为伸展滑晚阶段，形成以三个主滑脱面为骨架的滑脱构造系统；晚期为收缩阶段。这两个阶段的变形导致武当山的隆起以及兰片岩带的形成，有可能是华北与扬子地块沿该区北测商丹带碰撞的结果，属同碰撞伸展构造。

GEOTECTONIC EVOLUTION IN NANHUATANG AREA,NORTHERN WUDANGSHAN

The geotectonic evolution in Nanhuatang area of northern margin of Yangtze block has been resolved through the 1:50000 regional geological survey. Two important deformational episodes were gone through in the area. One of them is the Early Jinnin movement occured about 1000 Ma, which resulted in the uncomformity relationship between the Middle Proterozoic Wudangshan group and the late Proterozoi Yaolinghe formation, and another is the late Hercynian -Indosinian extensional deformation including the early extensional detachment stage and the late contractional stage. During the early stage the detachment system. taking three main detachment surfaces as the skeleton was formed. The extensional deformation made the Wudangshan be uplifted and the blueshist belt in the area be formed. It is likely that the extensional deformation is the result from the collisionvbetween the North China block and Yangtze block in the Shandan suture belt to North of the area.