库姆塔格沙漠东南缘BL剖面粒度记录的全新世快速气候事件

Abstract

Abstract: The loess is the important Quaternary terrestrial sediment. It is the dust carried by wind,and then accumulates and deposits. As a continuous deposition,loess records the changes of ancient climate and environment, which provides the main method or way to study the ancient climate process in Quaternary. The loess sediments are divided into clay loess,loess and sandy loess according to the particle size. The loess deposited at the margin of desert is mostly sand loess,which is the important material for studying the ancient climate in desert areas. During the humid interglacial climate period of Holocene,there were several rapid cooling or drying climate events. It is important to study the climate change in Holocene as it is closely related to the development of society. BL loess section is a continuous sandy loess sedimentary strata located at the northern foot of Altun Mountains, which is 25 km away from the southeastern margin of the Kumtagh Desert (39°24'10.98"N,94°16'0.12"E), and the deposition thickness in the study is about 350 cm. In this paper,the sandy loess sedimentary strata that deposits at the edge of Kumtagh Desert are used for studying the response of Kumtagh Desert to the global climate change. Especially,as a new trial,the coarse particle composition is used to reveal the ancient climate change in Kumtagh Desert. The soil is collected as the environmental sample every 5 cm in BL sand loess stratum,and the soil 350 cm in the bottom and 200 cm in the middle of the stratum is collected for OSL dating. Then,The OSL dating and grain size of the sediments are analyzed in the laboratory. The results show as follows: (1)The BL section deposition starts at 8.3 ka,which is in the early Holocene. The average grain size of the BL section is 53.31 μm,which is a typical sandy loess sedimentary strata. (2)In the arid environment,the coarse particle composition is used as a substitute indicator to reflect the wind gale. The BL loess section is located on the edge of the Kumtagh Desert where exists a gale weather process. By comparing the particle composition of >60 μm,>92 μm and > 110 μm,it is found that the component >110 μm can be used as the indicator for studying the winter monsoon. (3)The BL section has different levels of records for the six rapid climate changes since the beginning of the deposition,which is 0.4 ka,1.4 ka,5.5 ka,8.2 ka cooling events and 2.8 ka,4.2 ka dry events. The records show that Kumtagh Desert has a strong sensitivity to cold events while a general response to drought events. This study will offer a theoretical reference for disclosing the response of Kumtagh Desert to global climate change, the formation process of desert and regional desertification combating.

Key words: sand loess section, grains size, Holocene, rapid climate change events, Kumtagh Desert

CLC Number:

P534.63

TANG Jin-nian, DING Feng, ZHANG Jin-hu, SU Zhi-zhu, SUN Tao. BL section recording process of rapid climate change event of Holocene at southeastern edge of the Kumtagh Desert[J]., 2017, 40(6): 1171-1178.

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BL section recording process of rapid climate change event of Holocene at southeastern edge of the Kumtagh Desert

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