赣湘北部挤压造山与拉伸成盆的时序结构演化

ON EVOLUTION OF TILE TIME-ORDER STRUCTURES OF COMPRESSIVE OROGENY AND EXTENSIONAL BASIN FORMATION IN NORTH JIANGXI AND HUNAN PROVINCES

赣湘北部地区从元古代至新生代挤压和拉伸构造变化归纳为三个造山期和三个成盆期,依次为中晚元古代板块俯冲、地体碰撞遗山期;震旦纪至中奥陶世裂陷拉伸成盆期;晚奥陶式至志留纪倾滑压缩造山期;泥盆圮至二叠纪地裂扩张成盆期;早三叠世至晚三叠世前陆推覆造山期;侏罗纪至第四纪内陆伸展成盆期等。该区压缩—拉伸节奏相同的时序结构演变反映其构造运动发展史的特点,在杨子区具有普遍意义。

From the Proterozoic to the Cenozoic the tectonic change of compressive and extensional movements may be included into three orogenic periods and three basin-forming periods in northern Jiangxi and Hunan Provinces. In accordance with order they are: the orogenic period of plate subduction and terrane collision in the middie-late Proterozoic ; the basin-forming period of rifting and extension from the Sinian to the middle Ordovician : the orogenic period of dip slip compression from the late Ordovician to the Süurian ; the basin-forming period of taphrogeny and expansion from the Devonian to the Permian; the orogenic period of foreland-nappe from the early Triassic to the late Triassic; and the basin-forming period of interior-extension from the Jurassic to the Quaternary. Tbe evolution of the time-order structure with the rhythmic and alternative change reflects the characteristics of the history of the tectonic development in the study area, and this feature has a universal significance in the Yangtze region.