泰山南坡沉积物特征及第四纪冰缘环境探讨

针对泰山第四纪冰川有无的争议,在泰山南坡采集沉积物样品进行分析研究。孢粉分析结果显示优势植物种群为"松属+中华卷柏+蒿属+藜科",指示的沉积环境为湿冷环境。扫描电镜观察石英颗粒表面,显示出边缘棱角清晰、具贝壳状断口和解理片的冰川环境特征。通过热释光测试得样品年龄为(30.54±2.59)kaB.P.,相当于末次冰期主冰期中的Paudorf-Stillfried间冰阶。根据泰山现代气候环境推演泰山古气候温度和降水量,得出泰山地区在末次冰期时具备了形成冰川的基本气候条件。鉴于Paudorf-Stillfried间冰阶持续的时间较短,因此初步推断该沉积物指示的古气候环境为冰缘环境。

Study on Characteristics of Sediment in Southern Slope of Mount Tai and Quaternary Periglacial Environment

Pointing to the disbute whether there is Quaternary glacier or not in Mount Tai,sedimentary samples have been collected and analyzed in southern slope of Mount Tai.As showed by Pollen analysis,dominant plant species were "Pinus + Selaginella + Artemisia + Chenopodiaceae",and the indicating sedimentary environment was cold and wet environment.By the observations of quartz grain surface by using scanning electron microscopy,it indicated some glacier environmental characteristics,that is the edges and corners were clear with conchoidal fracture and cleavage plane.The sample age was 30.54±2.59 ka B.P,which was equivalent with the Paudorf-Stillfried in middle glacial stage.According to the modern climate and environment,the temperature and precipitation about Mount Tai paleoclimate have been evaluated.It is found that Mount Taish region had the basic weather conditions of the formation of glaciers in the last glaciation.However,due to short time of Paudorf-Stillfried,it is regarded that the palaeoclimatic and environmental as indicated by the sediments was periglacial environments.