海螺沟冰川成因浅析

贡嘎山地区发育有71条冰川,其中长5公里以上的有五条,海螺沟冰川是其规模最大海拔最低的一条。根据冰川的分布、形状和规模,它属山岳冰川类型,从成因上看,则属暧型动力变质冰川。 海螺沟冰川形成于16万年前,地处青藏高原东缘。冰川在纵向上,粒雪盆高置、冰舌低伸,其间,为特有高悬的大冰瀑布相联。冰川的形成与存在,主要与挽近时期的造山运动有关,并与有利的贡嘎山南北向构造山系地质背景、区域自然地理环境、南面的南北向横断山系及南部海域东南季风影响相联系。海螺沟冰川现处于强消融退缩时期,这与区域性气候以几十年期的振荡变化有关,与“温室效应”无关。冰川景观不会因目前的退缩而在可以预见的时期消失。

PRELIMINARY ANALYSIS OF ORIGIN OF HAI LUO DITCH GLACIER

Gongga mountain area has developed 71 glaciers, five of which are longer than 5 kilometers, Hai Luo ditch glacier is the largest in scale and the lowest in elevation in Gongga mountain area. According to its distribution, shape and scale, theglacier is a mountain glacier. But it belongs to the dynamic metamorphic glacier by its origih.Hai Luo ditch glacier formed about 1600 years ago on the east edge of Qinghai-Xizang plateau In its longitudinal direction, neve basin stands above, but glacier tongue stretches low. Between them the peculiar big high- hanging glacier cascades connect with each other.The formation and existence of glaciers were mainly concerned with the orogenic movement in recent periods，and with the geological background of north-southern tectonic mountain system of Gongga mountain，the natural regional geographical environment，the north-southern Hengduan mountain system in the south and the influence of southeastern seasonal wind on the southern sea region.Hai Luo ditch glacier is now in the strong melting and flinehing period，which is concerned with regional climate oscilation changes within scores of years，and in not concerned with“Greenhouse effect”.The scenes of the glacier don’t disappear in the predictable period because of flinching.