贵州晚新生代冰期划分与古冰川问题

Glacial Period Divisions and Palaeoglacial Problems of Late Cenozoic Age in Guizhou

贵州威宁中水一带出露的中水组,是新生代时期贵州地区最早的寒冷期记录,它有可能与副南极地区同位素曲线所表明的中新世晚期至上新世初的寒冷期对比。更新世时期,贵州部分高中山区曾发生过不只一次的冰川作用,其它地区则处于冻融作用比较强烈的冰缘环境中。根据孢粉、元素地球化学、同位素年代学与岩石学等方面的资料,太平洋深海氧同位素记录所反映的早更新世末以来的气候旋回,在贵州地区亦有所显示;贵州主要根据冰碛—冰水阶地及沉积物性质所划分的六次冰期可能均为复合冰期,而且有可能与阿尔卑斯地区的拜伯、多瑙、滚兹、民德、里斯、玉木冰期对比。

The zhongshui Formation in Zhongshui region of Weining,Guizhou,is the record of the earliest ceW period in Cenozoic Age in Guizh;su .Which may have been compared with the cold period from Late Miocene to Early Pliocene shown by isotopic curves of Subsouth Pole area. According to the data of spore-pollen,element geochemistry,isotopic chronology and lithology, etc. , the climate circulations since late early Pleistocene shown by the records of deep-sea oxygen isotope of the Pacific Ocean are also reflected in Guizhou. The six glacial periods divided mainly according to glacial moraines glacial water terraces and the features of sediments may have all been compound glacial periods and compared with Wurm. Riss.Mindel. Gunz.Donau. Biber glaciation of Alps area. In Pleistocene, glaciations occurred more than once in Guizhou, but scales were not Jarge and generally distributed in a few high and mid-high mountain areas Meanwhile, glaciosolifluction occurred in glacial marginal environment in other regions in Guizhou, where freezing and thawing actions were comparatively stronger.