南秦岭旬阳北部泥盆纪地层格架与盆地演化

运用层序地层学、盆地分析及构造地质的新理论新方法，对旬阳北部泥盆纪岩层序列进行了地层格架调查及盆地褶皱造山前岩层序列构造变形样式、变形变质特征和成矿作用观察研究认为：位于扬子板块北部被动大陆边缘的沉积盆地，主要受区域伸展链锁断层系及间歇性累进式上升的相对海平面变化等因素影响，基本连续发生了不同沉积体系的堆积和南北向与东西向相互交替、此长彼消有规律的岩相变化；伴随盆地伸展沉陷，岩层序列发生了由成岩作用、埋深变质作用到水平分层剪切及固态流变等连续发展、递进变化一系列相互联系动态发展的地质构造作用和成矿作用。

STRATIGAPHIC FRAMEWORK OF THE DEVONIAN SYSTEM IN THE NORTH XUNYANG IN SOUTHERN QLNLING AND THE BASIN EVOLUTION

Investigation of stratigraphic framework,observation and researches on deformation patterns of Devonian stratigraphic seguence at fold oroginy front,deformational metamorphism and mineralization in the north of Xunyang have been achieved by means of new theory and new method in relation to sequential stratigraphy,basin analysis and tectonics.Because the sedimentary basin located in the passive continental margin in the north of Yantze Plate was influenced by such factors as regional extensional chain fault system and intermittently progressive elevation relative to sea level,accumulation of different spdimentary systems,mutual alternating from south to north and from east to west and regularly lithofacies variation had happened in the basin.With extension and subsidence of the basin, the stratigraphic sequence developed frequently from diagenesis,and burial metamorphism to horizontal bedding shear to solid rheologic settling. Tectonic evolution and mineralization occurred in progressive changes with a series of mutually dynamic development.