【摘要】 地处青藏高原东北缘的祁连山系是晚新生代以来构造隆升的结果,酒泉盆地的沉积记录了祁连山隆升的过程;第四纪以来,在青藏高原强烈隆升的影响下,酒泉盆地的古地理环境演化变迁经历了漫长和复杂的过程。本文主要依据区内祁连山的冰期及冰川变化、第四纪地层特征及历史文化记录,结合酒泉黄泥堡乡第四纪研究钻孔资料中的孢粉分析成果等,在酒泉盆地第四纪以来建立了交替演化的12个寒冷期和12个温暖期,并分析了酒泉盆地第四纪沉积所记录的环境演变与祁连山隆升之间的关系,认为第四纪以来2500ka左右的“青藏运动B幕”之后,900ka左右的“昆仑-黄河运动”之后和150ka左右的“共和运动”之后随着青藏高原及祁连山的不断隆升,酒泉盆地的气候环境发生了三次大的转型。更多还原

【Abstract】 The Qilian Mountains located in the northeastern margin of Tibetan Plateau are products of the tectonic uplift since late Cenozoic, and the deposition of Jiuquan basin kept a record of the uplift process of the Qilian Mountains. During Quaternary, the paleogeography and environmental evolution of Jiuquan basin experienced a prolonged and complicated process, intensely affected by the uplift of Tibetan Plateau. According to such factors as the ice age and glacier change, the characteristics of Quaternary strata, the historical and cultural records and the palynological records in the Q(y1) drill hole at Jiuquan, the authors divided the Quaternary environment at Jiuquan basin into alternate 12 cold periods and 12 warm periods. The relation between the environmental evolution of (Jiu)-quan basin and the uplift of the Qilian Mountains is discussed and a conclusion is drawn that there have been three great climatic shifts in the Jiuquan basin since Quaternary, which occurred respectively after “Series B of Qinghai-Tibetan tectonic movement” (about (2 500) ka B P), after“Kunlong-Huanghe tectonic movement” (about 900 ka B P) and after“Gonghe tectonic movement” (about 150 ka B P).更多还原