Environmental Sign ificance and Character istics of Gra in Size of the Loess in Longxi Basin during the Last Glacial Period

XU Shu-jian; PAN Bao-tian; LI Qiong; GAO Hong-shan; Wang Jun-ping; HU Chun-sheng

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Article Navigation > Acta Sedimentologica Sinica > 2005 > 23(4): 702-708

XU Shu-jian, PAN Bao-tian, LI Qiong, GAO Hong-shan, Wang Jun-ping, HU Chun-sheng. Environmental Sign ificance and Character istics of Gra in Size of the Loess in Longxi Basin during the Last Glacial Period[J]. Acta Sedimentologica Sinica, 2005, 23(4): 702-708.

Citation:

Environmental Sign ificance and Character istics of Gra in Size of the Loess in Longxi Basin during the Last Glacial Period

1.
College of Resource and Environmental Science, Lanzhou University MOE Key Laboratory of Western China's Environmental Systerms,Lanzhou 730000;
2.
College of Geography and Tourism ,Linyi Teachers University, Linyi Shndong 276005

Received Date: 2004-12-25
Rev Recd Date: 2005-03-07
Publish Date: 2005-12-10

Abstract

Chinese loess-paleosol sequence has provided the most detailed terrestrial records of climate changes in Quaternary. The aeolian sand and dust has been taken as an important proxy of expansion and contraction of the desert during geological period. The signals of the desert evolution were well p reserved in the aeolian deposits on the margin of the desert, which are effective to reconstruct the desert expansion and contraction. According to the dominantwind direction, generally NW-SE, we systematically studies 24 sections ofMalan loess in the west of Chinese Loess Plateau during the Last Glacial period. Detailed granular analyses show the properties of temporal and spatial of theMalan loess, and reducing of the percentage of the sand from northwest to southeast. Our study indicates that the proxies such asD [ 4, 3 ] , the fraction > 40μm (%) , the fraction > 63μm (% ) , and theMode are more sensitive than any other proxy. A new linear correlation model of sand percentage and distance are established, which shows different pattern to the east of the Chinese Loess Plateau.
- eolian dust,
- character of grain size,
- loess,
- sand,
- Longxi Basin

References

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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Environmental Sign ificance and Character istics of Gra in Size of the Loess in Longxi Basin during the Last Glacial Period

1. College of Resource and Environmental Science, Lanzhou University MOE Key Laboratory of Western China's Environmental Systerms,Lanzhou 730000;

2. College of Geography and Tourism ,Linyi Teachers University, Linyi Shndong 276005

Received Date: 2004-12-25

Rev Recd Date: 2005-03-07

Publish Date: 2005-12-10

Key words:

Abstract: Chinese loess-paleosol sequence has provided the most detailed terrestrial records of climate changes in Quaternary. The aeolian sand and dust has been taken as an important proxy of expansion and contraction of the desert during geological period. The signals of the desert evolution were well p reserved in the aeolian deposits on the margin of the desert, which are effective to reconstruct the desert expansion and contraction. According to the dominantwind direction, generally NW-SE, we systematically studies 24 sections ofMalan loess in the west of Chinese Loess Plateau during the Last Glacial period. Detailed granular analyses show the properties of temporal and spatial of theMalan loess, and reducing of the percentage of the sand from northwest to southeast. Our study indicates that the proxies such asD [ 4, 3 ] , the fraction > 40μm (%) , the fraction > 63μm (% ) , and theMode are more sensitive than any other proxy. A new linear correlation model of sand percentage and distance are established, which shows different pattern to the east of the Chinese Loess Plateau.

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Environmental Sign ificance and Character istics of Gra in Size of the Loess in Longxi Basin during the Last Glacial Period

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