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冰川冻土  1992 

安第斯山脉中段的地质过程和冷生作用

, PP. 296-315

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Abstract:

本文描述了安第斯山脉中段南纬35°,西经70°附近面积为370km2的一个地区的地质情况和冻土情况。附有地质图、冻土图及露头-碎屑分布图。文中探讨了不同地质条件下的冻融作用及多年冻结效应。岛状多年冻土分布下界处在海拔3000m,这与安第斯山脉纬度较低地区的纬度-高度梯度相符。在5个地点发现了大型的古山坡堆积物,这些堆积物可能是由融冻泥流作用、碎石流和滑坡所形成的。在实验室内将不同种类的岩块在饱水条件下进行了250次冻融循环试验。根据以下4个方面来考虑这些岩类的野外地质冻融敏感性指标(FGFSC)1)露头指数(%);2)地貌情况;3)冻融过程的次数以及4)实验室冷生破碎情况。用这一指标解释各类岩石山地的高度规律。

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