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《Acta Geological Sinica》 1964-02
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Basing on the altitude of the Pleistocene névé-line and the lower limit of glaciationas well as other traces of glaciers,during the maximum glaciation(Qn)as an instance,it is proposed in this paper to classify the late ice-cover patterns into three categories:i.e.ice cap,dendritic cover and palm-form cover.Ice caps were all developed on pre-existing degradation surfaces,having the most limited extent of distribution; while den-dritic patterns on the other hand occupied the largest area.From the distribution ofmoraines along the passes of the divides and the extension of U-shaped valleys ap-proaching the summit region of the centres of glaciation development,where cirques be-ing found to lie in a row at the same elevation,it may be realized that glaciers of thispattern showing themselves in linear flowage and each of them possessing their respectivecentres of development.Such a pattern differs essentially from that of an ice-sheet.The pattern of palm-form cover should occur mostly in inland mountains.Being con-fined by limited precipitation,glaciers of this pattern would only occupy the upper partsof the main valleys. Owing to the higher relief of the pre-glaciation topography,in the region of thesouthern part of the N-S trending ranges of Szechuan and Yunnan and the TibetanPlateau,dendritic pattern would predominate,while in the northern part of the sameregion due to the great reduction of precipitation,palm-form pattern should prevail.Only in the intermediate zone,where the topography being less rugged and the pre-cipitation comparatively more favorable,ice caps might form.It thus follows that thedevelopment of ice-cover patterns depends on greatly topographic conditions in the re-gions of low latitudes and low humidity,whereas topography and climatic conditions areinterdependent on each other.
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