沂沭断裂带北段大盛-马站早白垩世盆地成因分析

Analysis of Origin of the Early Cretaceous Dasheng-Mazhan Basin in the North Part of Yi shu Fracture

为了分析大盛 -马站盆地的成因类型 ,重点调查了盆地内沉积相带的空间展布特征及盆地沉积中心迁移的规律 .盆地内同生构造显示盆地边缘主干断裂具有左行走滑特点 .盆地内生物化石及火山岩年代学特征表明盆地形成于早白垩世 .盆地性质为左旋走滑拉分盆地 。

In order to analyze the origin of the Dasheng Mazhan basin in the north part of Yi Shu fracture, the spatial distribution regulation that suggests the depocenter of the basin migrated northerly is investigated. The sedimentary structures in the basin indicate that the major boundary faults of the basin are left slip faults. The collected fossils and the age of volcanic rocks determined in the basin illustrate that the basin developed in Early Cretaceous. The Dasheng Mazhan basin is a typical sinistral pull apart basin, which suggests that the Tanlu fault zone underwent sinistral strike slip during Early Cretaceous.