山东沂水沂沭断裂带西部中下寒武统岩石地层及沉积特征

山东沂水沂沭断裂带西部寒武纪地层发育．中、下寒武统岩石地层单位划分４个组９个正式和非正式段。早期为滨海相陆源碎瞩岩夹碳酸盐岩沉积，晚期为滨—浅海相碳酸盐岩沉积．属于陆表海环境，为发育鲕粒摊和藻礁的缓坡盆地相模式．划分出七个三级沉积旋回．通过对比表明：沂水西部与复州地区中下寒武统岩石地层单位相当、沉积环境相似，为郯庐断裂带左行平移量估算及沉积古地理恢复提供佐证．

THE CHARACTERISTICS OF LITHOSTRATIGRAPHY AND DEPOSITION OF MIDDLE-LOWER CAMBRIAN SERIES IN WEST OF YISHU FAULT ZONE IN THE YISHUI AREA,SHANDONG PROVINCE

Lithostratigraphic units of the Middle-Lower Cambrian series in the west of Yishu fault zone in Yishui,Shandons province may be divided into four Formations,which are subdivided into nine formal and informal members. In the early stage,the sedimentation was terrigenous debris of littoral fscies sandwiching carbonates. In the late stase,it was carbonates of littoral-neritic factes. The sedimentary environment belongs to epeiric sea,the sedimentary pattern is rampbasin factes pattern of oolitic bank and alsal reef,and the sedimentary cycle may be divided into seven grade-three cycles. The correlation indicates that the Middle-Lower Cambrian lithostratigraphic units of the west of Yishu fault zone in Yishui, Shandong province correspond to that of Fuzhou in Liaoning province. The results provide the proof for estimating the left-lateral translation range of Tan-Lu fracture and for recovering the sedi-paleogeogrphic pattern.