【摘要】 <正> 山东蓬莱、栖霞、沂水、临朐等地分布大片新生代玄武岩。过去主要根据其下伏松散沉积层的时代,与临朐中新统山旺组对比,划分为中新世下玄武岩和上新世上玄武岩。 1972年作者之一,在蓬莱一带发现玄武岩覆盖在第四纪黄土层之上,使黄土受到明显烘烤,又在多处发现玄武岩覆盖在不同高度的剥蚀面及松散沉积层之上,这不仅表明本区有第四纪玄武岩和火山产物存在,而且反映新第三纪以来有多期活动的特点。据此,曾将本区玄武岩活动分为四期:更多还原

【Abstract】 According to the preliminary results of thermoluminescence dating, the baked bed and loess from Hongshishan of Penglai yield the ages of 0.839±0.012 m.y., 0.920±0.013 m.y. and 1.032±0.018 m.y. B.P.; the age of the baked bed from Wuliqiao of Penglai is 1.148±0.018 m.y. B.P. and the age of the baked bed from Shanghulin of Lingu is 0.945±0.013 m.y. B.P.This results are consistent with geological conclusion that the age of basalt belongs to the early Middle-Pleistocene or late Early-Pleistocene, according to the basalt flows resting directly upon the Lower Pleistocene Wucheng Loess.更多还原