Magnetic characteristics and their paleoclimatic significance of Fengzhou loess in the Qinling Mountains of China |
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Authors: | Xiangyi Lei Leping Yue Jianqi Wang Li Zhang |
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Institution: | (1) Department of Geology, Northwest University, 710069 Xi’an, China |
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Abstract: | The Fengzhou loess section is very typical in the Qinling Mountains. The section, about 82 m thick and underlain by the Neogene
red clay, consists of 33 layers of loess and 33 layers of paleosol. The section covers Brunnes normal polarity zone and Matuyama
reversed polarity zone, and the B/M boundary is located in the middle of L8. Matuyama reversed polarity zone records Jaramillo, Olduvai and Reunion normal polarity subchrons. The boundary between Matuyama
reversed polarity zone and Gauss normal polarity zone (M/Ga) appears in the lithological boundary between loess and the Neogene
red clay. Loess accumulation in Fengzhou started before 2.48 Ma. The magnetic susceptibility curve indicates 33 cold-dry and
humid-warm cycles of paleoclimatic variation in the Qinling Mountains during the last 2.48 Ma. The above climatic fluctuation
may be well compared with that of the oxygen isotopic records from deep-sea deposits. |
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Keywords: | Qinling Mountains paleoclimatic change magnetic susceptibility magnetostratigraphy of loess |
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