摘要
金衢盆地发育于浙西钱塘台拗和浙东华夏褶皱带接洽部位,受北东向和东西向断裂联合制约,燕山期(?)幕区域应力转入拉张体制断陷成盆地。盆底盖层由老到新为坡麓相→河流相→河湖相→湖相→河湖相→河流相→(缺层)→河流相。反映了金衢盆地沉积环境为山间盆地,经历了:箱形谷→盆地→湖盆→盆地→准平原→盆地的复杂演变过程。
Jinhua-Quzhou Basin is situated at the junction of West Zhejiang Qiantang syncline and East Zhejiang folded zone. It is controlled by thd fractures with directions both of north to east and of east to west. The graben and semi-graben in the shape of a dust-pan are caused by regional stress, converted later to pull-tension system,during the episode Ⅲof Yanshan Period,its stretching direction being northeast by east. The sedimentary deck of Jinhua-Quzhou Basin is composed of . the Qujiang Group of Cretaceous System and Quaternary sediments. It has a certain regularity of phase varironment of the basin has different stages in time. In the sedimentary deck,from bottom to top,the types of sedimentary phase change from deluvium-proluvium phase to alluvium-lacustrine deposits phase lacustrine deposits phase alluvium- lacustrine deposits phase alluvium phase alluvium-proluvim phase. It reflects that the sedimentary emvironment of Jinhua-Quzhou Basin has experienced different evolution processes: box-shaped valley inland basin lake basin inland basin peneplain inland basin.
出处
《山地研究》
CSCD
1993年第1期15-22,共8页
关键词
金衢盆地
沉积环境
演变
盆底盖层
Jinghua-Quzhou Basin, evolution of sedimentary environment, Quaternary sediments
