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关于我国东北地区多年冻土形成时代,从本世纪六十年代开始就有过各种看法。有人认为是更新世冰期的产物;有人认为既有更新世的残留,又有现代小冰期形成的。近年来,该区综合水文地质普查及新生代地层编表工作的开展,积累了大量地层、古生物、古冻土遗迹等方面资料。特别是孢粉分析及同位素等方法的广泛应用,对于该区第四纪地质历史、古地理环境演变、以及古气候变迁的认识有了长足的进展,为本文讨论第四纪时期古冻土演变和现今冻土的形成时代提供了丰富的资料。
On the formation of permafrost in Northeast China, there have been various opinions since the 1960s. Some thought it was a product of the Pleistocene glaciation; some thought that both Pleistocene residues were formed during the modern Little Ice Age. In recent years, the comprehensive hydrogeological survey and the work of the Cenozoic stratigraphic tabulation in this area have accumulated a great deal of information on the strata, paleontology and ancient frozen soil relics. Especially sporopollen analysis and isotopes, have made great progress in understanding Quaternary geological history, palaeogeographic environment evolution and paleoclimatic change in this area. This article discusses the evolution of paleo-frozen soil in Quaternary period And the formation of today’s frozen soil provides a wealth of information.