沂沭断裂中段莱阳群浊积地层的特征及意义

沂沭断裂中段的石场—中楼一带，存在受北北东向断裂控制的早白垩世莱阳群火山碎屑岩系。沉积厚度大于６２６３．７１ｍ，主体为火山碎屑浊积岩，层序结构以间断不完整的鲍马序列为主，形成于沂沭断裂强烈活动的构造背景。在综合盆地边界断裂的构造形迹、盆地沉积中心的迁移状态以及浊积地层沉积特征的基础上，讨论了莱阳群浊积地层形成与郯庐断裂早白垩世走滑运动的关系。

STUDY OF TURBIDITE STRATA OF THE LAIYANG GROUP IN THE CENTRAL SECTOR OF THE YISHU FAULT

A volcaniclastic series of the Early Cretaceous Laiyang Group controlly by NNE trending faults is distributed in the Shichang Zhonglou area in the central sector of the Yishu (Yihe Shuhe) fault. It, with a total thickness of over 6263.71 m, consists dominantly of volcaniclastic turbidites. The sedimentary structures of the sequence are mainly marked by a discontinuous, incomplete Bouma sequence. They originated in a tectonic setting of strong activity of the Yishu fault. On the basis of an integrated study of the structural features of the boundary fault of the basin, migration of the depocenter of the basin and sedimentary characteristics of the turbidites of the Laiyang Group, the paper discusses the relation of the formation of the turbidites of the Laiyang Group with the strike slip movement of the Tanlu (Tancheng Lujiang) fault during the Early Cretaceous.