腾格里沙漠晚更新世以来湖相沉积年代学及高湖面期的初步确定  

Preliminary Study on the Chronology of Lacustrine Deposits and Determination of High Palaeo Lake Level in Tengger Desert Since Late Pleistocene

作　　者：张虎才[1,2] 

机构地区：[1]兰州大学地理科学系 [2]柏林自由大学地理研究所

出　　处：《兰州大学学报（自然科学版）》1997年第2期87-91,共5页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金

摘　　要：对腾格里沙漠古湖泊沉积和地貌的考察及对典型代表剖面初步研究结果表明，一个连续而巨大的淡水湖泊高水位形成于距今３．９～３．６万年前．在距今３．３～２．３万年期间，腾格里沙漠西北部曾存在一面积至少达１６２００ｋｍ２、水深２５ｍ（白碱湖，最大水深超过６０ｍ，分布于大海子一带）的淡水湖泊．大量的瓣鳃类、腹足类化石及介形类化石组合的存在表明该时期湖泊水温不低于１０℃，由此把该时期的湖泊暂且称“腾格里大湖”（ＭｅｇａｌａｋｅＴｅｎｇｇｅｒ）The filed investigation on palaeo lake deposits and landforms, and the primary analytic results on the typical sections indicate that a lake level about 30～31m higher than present playa surface was formed at 3.9～3.6×10 4 aBP. During that time there existed a vast continual fresh water lake. In the period between 3.3～2.3×10 4aBP, a lake, about 25m deep in Baijian Hu area and over 60m deep in Dahaizi area existed in NW Tengger Desert. This palaeolake covered at least about 16200 km 2 in area. Abundant fossil assemblage of shells, snail, and ostracoda reveal that at that time, the water temperature was higher than 10℃. Based on variety evidences, the paleaolake formed in that period is called Megalake Tengger.

关 键 词：晚更新世 湖相沉积 年代学 高湖面期 古环境 

分 类 号：P531[天文地球—古生物学与地层学] P534.631[天文地球—地质学]