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在地质历史上曾出现过几次大冰期。其中最近的两期都是全球性的,时间也比较确定。它们是第四纪大冰期(发生在近二百万年)和晚古生代大冰期(距今约2—3亿年)。在每一次大冰期中,又可分为几个冰期和间冰期。在大冰期之间是非冰期。关于气候变迁的原因或冰期的成因问题,在科学界至今还是一个“谜”。虽然前人曾提出过各种各样的理论,但是正如李四光(1972)和施瓦茨巴克(Schwarzbach,1974)等所指出的:这些论点都不足以说明气候变迁的原因或冰期的成因问题。近几十年来,大量新的科学资料的积累,尤其在海洋研究方面所取得的进展,为这个问题的解决提供了素材。
In the geological history there have been several major ice age. Two of the most recent are global and time is relatively certain. They are the Quaternary Great Ice Age (occurred in nearly two million years) and the Late Paleozoic Ice Age (about 2-3 billion years ago). In each Great Ice Age, it can be divided into several glacial times and interglacials. Between the Great Ice Age is non-ice period. The cause of the climate change or the ice age is still a “mystery” in the scientific community. Although various theories have been proposed by the predecessors, as Li Siguang (1972) and Schwarzbach (1974) pointed out, these arguments are not enough to explain the causes of climate change or the genesis of the ice age. The accumulation of a large number of new scientific materials in recent decades, especially in marine research, has provided material for the solution of this issue.