摘要
贵德盆地是黄河上游所流串的重要新生代断陷盆地之一，早第三纪开始呈现堆积洼地形态；晚第三纪是其发育的鼎盛时期，其内的水体与共和、兴海、青海湖和西宁等盆地的水体相连，构成一浩瀚的“青东古湖”，堆积了上千米厚的含三趾马（Hipparionsp）等动物化石的贵德群。早、中更新世，盆地有所收缩，但仍为河湖环境。大约14×104年前开始的构造运动使盆地抬升，黄河在这里出现，自那以来黄河累计下切了900－1000m。
Guide Basin,one of the important Cenozoic fault basins at the upper reaches of YelIowRiver, has recorded the uplift processes of Qinghai －Xizang Plateau and developing historyof Yellow River. It appeared as a depression in Early Tertiary, and Late Tertiary was theprosperous period of its development. Its water body linked with that of the basins ofGonghe, Xinghai, Xining and Qinghai Lake, and composed a huge lake named the IIEasternQinghai palaeolake' More than 1000 m thick of Guide Group including zoolites of Hipparionsp. deposited in Guide Basin－ In a period from Early to Middle Pleistocene, Guide Basin became smaller than that before and deprsited the alluvial and Iacustrine sediments for 200300 m thick, but the basin was still occupied by a lake and linked with Qinghai Iake througha river. A tectonic uplift began l4O ka B. P. ago made Guide Basin rise. Then, Yellow Riverappeared, and it has cut down for 900－ 1000 m since last more than 100 ka B. P.. The upliftand dry climate made Guide Basin lose the water link with the Qinghai Lake in Late Pleistocene.
出处
《干旱区地理》
CSCD
北大核心
1994年第3期43-50,共8页
Arid Land Geography
基金
国家自然科学基金
青年基金!49101001
关键词
黄河发育
盆地演化
贵德盆地
development of Yellow River
basin evolution
Guide Basin
