岩溶洞穴堆积与第四纪冰期气候

第四纪气候有过多次大幅度波动,是环境变化的一个重要因素,反映到第四纪的各个方面,因此也必然影响到岩溶洞穴的发展和沉积。在不同气候带,岩溶地貌有不同特点,沉积物也有变化。以常见的钟乳石来说,在热带和温暖气候下,它们的形体特别高大,姿态万千;在温带和寒冷气候下,则比较简单,形体萎缩。如我国广西等地著名的峰林地形,是在热带气候下长期发展的结果;而今天在温带以至西藏高原上保留的热带岩溶地貌,则是在第三纪晚期,或

DEPOSITS IN LIMESTONE CAVE OF EROSION AND THE QUATERNARY CLIMATIC CHANGES

In the Quaternary Period, the climate underwent great changes, which influenced greatly the progress of the erosion of limestone and thus the accumulation of sediments in caves formed as a result. In the limestone areas of mountainous regions, cave sediments of different geological ages exist even in a small area. These different sediments show they had special contact relations. Most of these sediments reflect climatic changes. Recently about 100 km southeast of Nanjing was discovered a cave in the sediments of which fragments of ceramics were found together with several Crocuta ultima, C~(14) 11,200 ± 1000 B. P. with sediments of a still earlier data. All the cave deposit, fossils of mammals and pollen indicate paleoclimatic fluctuations.