Changes of Sedimentary Environment Since Late Middle Pleistocene of Qingtu Lake in Northwestern Margin of Tengger Desert

Abstract

Abstract: Based on the analyses of sediment, OSL dating, grain size, magnetic susceptibility of lake sediments from core ZK1 in Qingtu Lake, the northwestern margin of Tengger desert, this paper reconstructs the history of lake evolution since late Middle Pleistocene. The results indicate that Qingtu Lake experienced dry-cold and warm-wet climates in Middle Pleistocene, warm-wet and dry-cold climates in Late Pleistocene, which is accorded with climate cycle characteristics of the last glaciation and last interglaciation in MIS. Meanwhile, Qingtu Lake experienced the evolutions of the dry-cold and warm-wet climate in the Holocene. Therefore, this study reflects the evolutions of climate in the northwestern margin of Tengger desert during Late Quaternary and provides the basis for Qingtu Lakes climatic and environmental evolutions since late Middle Pleistocene.

Key words: Qingtu Lake, late Middle Pleistocene, grain size analysis, change of sedimentary environment, OSL dating, northwestern margin of Tengger desert

CLC Number:

P534.63

WANG Li-yuan, CHENG Jie, XIN Wei, ZAN Li-hong. Changes of Sedimentary Environment Since Late Middle Pleistocene of Qingtu Lake in Northwestern Margin of Tengger Desert[J]. Geoscience, 2013, 27(4): 949-958.

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