华北地台东部早中寒武世古气候的识别标志及变化旋回

RECOGNITION MARKS AND VARIATION CYCLE OF EARLYMIDDLE CAMBRAIN PALEOCLIMATE IN THE EAST OF NORTH CHINA PLATFORM

本文依据蒸发岩及伴生沉积构造、沉积红层、碳酸盐类及鲕粒沉积、古生物、古风化壳类型、古水温、海绿石等沉积标志以及与海平面变化的关系，以山东沂水地区为分析重点，结合华北地层区的特征，将华北东部的早中寒武世古气候初步划分为六个温暖潮湿—干燥炎热气候变化旋回（基本上与三级海平面变化一致，周期１Ｍａ～１０Ｍａ），１３个气候期。进而确定本区属于温带—热带半干旱气候区，地处中低纬度。

Based on recognition marks of evaporate and associated sedimentary structures, sedimentary red beds, carbonate and ooid sedimentation, paleobiology, paleoweathering crust types, paleowater temperature, glauconite,and their relationship with sealevel change, the EarlyMiddle Cambrain paleoclimate of the east of North China platform was preliminarily subdivided into 6 warm humiddry hot variation cycles and 13 climate periods. In the end, it was determined that the studied area belonged to temperatetropical semiarid climate zone and was located at midlow latitude.