| Loess-soil sequences in southern Anhui Province： Magnetostratigraphy and paleoclimatic significance |
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| 作者姓名： | QIAOYansong GUOZhengtang HAOQingzhen WUWenxiang JIANGWenying YUANBaoyin ZHANGZhongshi WEIJianjing ZHAOHua |
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| 作者单位： | [1]InstituteofGeologyandGeophysics,ChineseAcademyofScience,Beijing100029,China [1]StateKeyLaboratoryforBiologyofPlantDiseaseandInsectPests,InstituteofPlantProtection,ChineseAcademyofAgriculturalSciences,Beijing100094,China [2]SKLLQG.InstituteofEarthEnvironment,ChineseAcademyofSciences,Xi＇an710075,China |
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| 摘 要： | Two parallel loess-soil sequences from Xuancheng and Fanchang in southern Anhui Provinces are dated using geomagnetic and luminescence methods.The Brunhes/Matuyama(B/M) reversal boundary is recognized within the lower part of the so-calles Vermiculated Red Soil (VRS) in the Xuancheng section while the entire Fanchang sequence is of Brunhes age.This indicated that the most recent VRS in southern China,a stratigraphic marker and an indication of extremely warm-humid conditions,was formed during the middle Pleistocene,chronologically correlative with the S4 and S5 soil units in northern China.Microscopic and sedimentologic in vestigations reveal that eolian deposition started in this region at about 0.85 MaBp,roughly synchronous with the well-known Mid-Pleistocene climate change of global significance.The strengthening of both summer and winter monsoon circulations and the consequent river hydrological changes at that time would have provided favorable conditions for sustained eolian deposition in the middle-lower reaches of the Yangtze River since 0.85 MaBP.
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| 关 键 词： | 黄土性土壤 安徽 磁性地层学 古气候 虫蛀状红土 风积物 |
Loess-soil sequences in southern Anhui Province: Magnetostratigraphy and paleoclimatic significance |
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| QIAOYansong GUOZhengtang HAOQingzhen WUWenxiang JIANGWenying YUANBaoyin ZHANGZhongshi WEIJianjing ZHAOHua.Loess-soil sequences in southern Anhui Province: Magnetostratigraphy and paleoclimatic significance[J].Chinese Science Bulletin,2003,48(19):2088-2093. |
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| Authors: | Yansong Qiao Zhengtang Guo Qingzhen Hao Wenxiang Wu Wenying Jiang Baoyin Yuan Zhongshi Zhang Jianjing Wei Hua Zhao |
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| Institution: | (1) Institute of Geology and Geophysics, Chinese Academy of Sciences, 100029 Beijing, China;(2) SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, 710075 Xi’an, China |
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| Abstract: | Two parallel loess-soil sequences from Xuancheng and Fanchang in southern Anhui Province are dated using geomagnetic and luminescence methods. The Brunhes/Matuyama (B/M) reversal boundary is recognized within the lower part of the so-called Vermiculated Red Soil (VRS) in the Xuancheng section while the entire Fanchang sequence is of Brunhes age. This indicates that the most recent VRS in southern China, a stratigraphic marker and an indication of extremely warm-humid conditions, was formed during the middle Pleistocene, chronologically correlative with the S4 and S5 soil units in northern China. Microscopic and sedimentologic investigations reveal that eolian deposition started in this region at about 0.85 MaBP, roughly synchronous with the well-known Mid-Pleistocene climate change of global significance. The strengthening of both summer and winter monsoon circulations and the consequent river hydrological changes at that time would have provided favorable conditions for sustained eolian deposition in the middle-lower reaches of the Yangtze River since 0.85 MaBP. |
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| Keywords: | loess vermiculated red soil eolian deposit magnetostratigraphy |
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