赣中安福煤田重力滑覆构造带变形岩石的显微构造研究

Microstructures of Deformed Rocks from the Gravity Gliding Nappe of Anfu Coal Field in Central Jiangxi Province

安福重力滑覆构造带中变形岩石的显微构造反映了:(1)该构造带变形的温压具有中间高两侧低的特点;(2)北缘滑覆带的三条断层变形的温压自北向南依次增高;(3)石英C轴组构具有“不完全小圆环带加点极密”的特点。这些证据说明了该区在近南北向应力作用下发生了多次重力滑覆。

The microstructures of some rocks from the Anfu gravity gliding nappe indicate that: 1. The deformation temperature and confining pressure of the structure in the central zone of this nappe are higher than that in the both sides; 2. The deformation temperature and confining pressure of the three faults in the north side of the nappe increase step by step in the direction of north towards south; 3. The pattern of the quartz C-fabrics is mainly characterized by the imperfect small circle girdle with maxima. These evidences support the view that the nappe has a history of multiperiodic gliding under the stress from north to south.