【摘要】 <正> 螺髻山是我国最东一个有多次古冰川作用而无现代冰川作用的山地,是研究我国东部第四纪冰期历史的理想场所。 螺髻山位于川西山地南部,凉山州首府西昌以南10km处,是一个南北长约80km,东西宽约30km的山脉单一的山地,主峰海拔4359m,比邻近山地如贡嘎山、玉龙山、牦牛山山地的现代雪线高度(4900—5000m)要低近500—600m。 螺髻山西临安宁河断陷谷地(海拔1200m),相对高差3150m左右;东邻邛海普格断裂谷地(海拔1500m左右),相对高差2800m左右。组成螺髻山的岩石主要是震旦系列古六砂岩、白云质灰岩、凝灰岩等,走向多近南北向和北西向,主要断裂方向也大致如此。更多还原

【Abstract】 In the Luojieshan mountain, there are four series of paleogfacial traces indicating the corresponding mutiglaciations, i.e. the oldest one-Bamudi Ice Age, the older Luojieshan Ice Age; the younger - Dahaizi Ice Age; and the youngest one neoglaciation or Zhiluoda Ice Age. They are corresponding to the Minder, Riss, Wurm and Neoglaciation respec - tively.Cirques, trough valleys, moraines and nettles on the original flat top of the northern Luojieshan near the Bamudi highland (4200m) were formed during the Bamudi Ice Age, characterized by small ice caps with small glacial tongues. Afterward, it followed by the Baibaiding ’interglacial period. During such a long period, the erosion was so strong that landforms were changed considerably. During the next glaciation the Luojieshan Ice Age, some deeper and wider trough valleys and lager moraines were well-developed. The overflow valley glaciers extended as long as 10km or more and their teminus went down to an elevation of 2500m. The glacial landforms were not changed too much during the Qingshuiguo interglacial period. In the Dahaizi !ce Age landforms formed by glacial erosion, such as troughs, cirque lakes, glacial erosion lakes, glacial bosses, roche moutonnee and subglacial channels, were well-developed and well pressrued. Especially, the numerous and large grooves, typical in form, should be the exceptional features there. There are lots of crescentic cracks in those grooves, some of them tilt downward the valley, others tilt upstream. But they are all located at the wall foot of trough valley.更多还原