摘要
勒穆尚洞是位于列日市东南的一个巨大的喀斯特洞穴,作者对位于上层与下层通道连接处的沉积物进行了孢粉研究,根据沉积物性质不同,剖面可分两部分,下部由河流相的砂砾组成,上层为数层石笋质盖板。最上层的石笋质盖板经放射性钍(?)铀(?)法测定,年代为距今10.5万a。 根据孢粉分析,石笋质盖板层可能形成于距今10.5万a的里斯—玉木间冰期中期,当时气候温暖潮湿,生长有以榛、栎、赤杨、千金榆为主,伴有一些椴、榆、常春藤等的阔叶林,洞穴处于低洼积水的环境。剖面下部的砂砾是在此温暖期之前由地下河在不同气候条件下多次堆积而成。 此外,本文还讨论了古植被及古气候的变化以及该洞穴的演化历史。
The Remcuchamps Cave is a huge karst cave located southeast of Liege city, Belgium. The authors have studied the deposits at the joining part between the upper and lower levels by means of sporopollen analysis. The profile car be recegnized to consist of two parts according to different properties of the sediments.The lower part is composed of fluvial gravels and sand, whereas the upper part is composed of several layers of stalagmite plates, with the top stalagmite plate dated 105000 years B.P.by radioactive Th230/U234 method.
The sporopollen analyses indicate that the stalagmite plates were probably formed in the middle period of the Riss-Wurm interglacial epoch about 105000 yrs.B.P,when the climate was warm and humid. There were broad-leaf forests consisting of Corylus, Quercus. Alnus, Carpinus with some Tilia, Ulimus,and Hedera The cave was in a low-lying and waterlogged area. The gravels and sand in the lower part of the profile were transported and deposited repeatly by an underground river under different climatic conditions before that warm period.
Additionally, the paper discusses the changes in paleovegetation and paleoclimate,as well as the evolution history of the cave.
出处
《中国岩溶》
CAS
CSCD
北大核心
1990年第4期353-362,共10页
Carsologica Sinica
