论文部分内容阅读
结合热释光测年的结果,对Vistula下游地区Vistula沉积地层学和沉积岩石学的近期研究为Drozdowski早期提出的Vistula冰川层序年代地层学划分的三分法提供了证据。出冰碛物与冰碛间的水成沉积物所提供的所有热释光年代都与两个主要的亚冰期有关,按照沉积岩石学的分析,这两个亚冰期似乎代表下列两个独立的冰川旋回:较老的一个距今约59000～51000年;较新的一个距今约17000～15000年。两者间的一段时间命名为Grudziadz间冰期,它是相当冷的。这一间冰期的证据除冰川沉积间断外,还有在早期的冰消作用期间冰下河流切割沟槽的一些充填物,黄土状粉砂,化石砂楔和海侵的海相沉积。后者出现在这一地区北部的局部地区。
Combined with the results of thermoluminescence dating, a recent study of Vistula sedimentary stratigraphy and sedimentary petrology in the lower Vistula region provides evidence of the Drewzski’s earlier dichotomy of the Vistula glacial sequence chronostratigraphy. All of the thermoluminescence ages provided by hydrochemical sediments between moraines and moraine are related to two major sub-glacial stages. According to sedimentary petrology, these two sub-glacial periods appear to represent the following two independent Glacier cycle: the older one is about 59,000 ~ 51,000 years ago; the newer one is about 17,000 ~ 15,000 years ago. The period between the two was named Grudziadz interglacial, which is rather cold. Evidence of this glacial period includes, apart from glacier deposits, some of the fillings of the icy river cutting trenches, marine deposits of loess-like silt, fossil sand wedges and transgressions during the early deicing operation. The latter appears in parts of the northern part of the region.