摘要
贡嘎山区在全新世初期（１００００－７５００ａＢＰ），气候渐暖，冰川后退，泥石流发生频次剧增；中期（７５００－４０００ａＢＰ），出现高温气候，冰川强烈后退，沉积物则以冰水河流相为主；晚期（＜４０００ａＢＰ），气候转冷，出现新冰期。嗣后，气候转暖，但有三次明显的冰进过程；４００ａＢＰ前，气候再度转冷，出现小冰期。大量的泥石流点是出现在气候转暖、冰川退缩的初始阶段。
In the Gon gga Mountainous Regioin,the relationship between the glacier variation and thedebris flow development is very close. In the carly Holocene, the climate became warm,the glaciers gradually retreated,and formedthe debris flow laver in the lower section of the fourth glaciofluvial terrace(T_4). In the Hypsithermal period of the middle Holocene(7 500-4000a BP),the glacier retreatedstrongly and formed the middle and upper sections of T_4(7500±4000a BP ) including somedebris flow layers.In the late Holocene,the climate turned into cold and the Neoglaciation can divided into 3stages of the glacier advance:the pre-Guanjingtai glacier advance(>3080±80a BP) , heGuanjingtai glacier advance( 2 35 0±65 1 530±80a BP)and the Hailougou glacier advance(84o±85-78o±90a BP). And also the 3 glaciofluvial-dedris flow terraces are formed respec-tively :T_3 4 000-3000,T_2 3 000-1200 and T_1 1200-750(a BP)。The earliest of the Modern Little Ice Age appeared in 400a BP,and thete were 3 times of Cli- mate waving.Resentily,the climate turned into warm,and the debris flow appeared much more.
出处
《山地研究》
CSCD
1994年第1期1-8,T001,共9页
关键词
贡嘎山区
全新世
冰川变化
泥石流
Gongga Mountainous Rgeion,Holocene,glacier variation,debris flow
