塔克拉玛干沙漠腹地第四纪地层划分与环境变迁

通过塔中地区KT1孔和KT2孔井下第四纪地质测试研究，首次揭示出：塔克拉玛干沙漠腹地在深度653.80m以上，沉积物可划分42层，基本属于第四系。第四系下限初步定在761.17m深处。第四纪以来的气候演化大体有过3次大的气候波动和13个较大气候波动旋回。沉积环境早更新世为河湖相泛滥平原；中更新世以洼地湖泊相沉积为主，同时明显加入了风沙环境堆积，沙漠开始形成；从中更新世晚期开始，经晚更新世到新世，沙漠大规模形成，并逐步发展成今日的大沙漠景观。

STRATIGRAPHIC SUBDIVISION AND CLIMATIC CHANGE OF THE QUATERNARY OF THE CENTER TAKLIMAKAN DESERT

The study of wells KT1 and KT2 in the central Tarim basin reveals that the sediments beneath the desert at depth of 653.8 m contain 42 layers and are basically Quaternary in age (The lower limit of the Quaternary is at 761.17 m). The climate has gone through 3 large and 13 relatively large changes since the Quaternary. The sedimentary environment during the early Pleistocene is fluviolacustrine, corresponding with flooded plain. The middle Pleistocene is mainly composed of lacustrine sediments, with clear evidence of eolian sediments, indicating the initiation of desert. From the latest middle Pleistocene to late Pleistocene and Holocene, large-scale desert formed and gradually evolved into present great landscape.