山东省高密—景芝一带晚更新世以来沉积特征与沉积环境分析

Analysis on Sedimentary Characteristics and Environment in Gaomi—Jingzhi Area in Shandong Province since Late Pleistocene Period

摘要:

基于研究区施工的39个第四系浅层钻孔资料，通过系统采集粒度、孢粉、自然重砂、14C等样品，对研究区晚更新世以来地层结构、沉积类型及沉积相等进行了详细研究。结果表明，黑土湖组沉积早于10154BP，临沂组以1500~3500BP为主要沉积时期。晚更新世—全新世以来气候经历了温凉偏干、温暖湿润、趋于温凉3个阶段。粒度分析表明，于泉组为河床河漫滩沉积；第四纪沉积物主要来源为北侧胶北基岩隆起区，搬运距离短。对研究区第四纪沉积物按成因类型进行沉积相划分与对比，初步建立了沉积模式。

Abstract:

Based on the date of 39 shallow Quaternary boreholes constructed in the study area，through collecting size, pollen, natural heavy concentrate and 14C samples , the stratigraphic structure sedimentary types and sedimentary have been studied in detail. It is showed that the deposition of Heituhu formation is earlier than 10154BP, and main sedimentary period of Linyi formation is 1500~3500BP. Since the late Pleistocene and Holocene period, the climate has experienced three stages, they are warm, cool and dry period, warm and humid period, warm and cool period. As showed by size analysis, Yuquan formation is riverbedfloodplain deposits. Quaternary sediments are from the north uplift area of Jiaobei bedrock uplift area，and the transportation distance is short. The sedimentary facies of Quaternary sediments in the study area are divided and compared according to genetic types, and the sedimentary model is preliminarily established.