A grain-size record from Beijing region in Northern China: Late Quaternary paleoclimate oscillation in response to global change |
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| Authors: | Guifang Yang Zhiliang Ge Qing Dai Jie Cheng Gongming Yin Lihong Zan and Jingwei Liu |
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| Institution: | (1) School of Earth Sciences and Resources, China University of Geosciences, Beijing, 100083, China;(2) Institute of Geology, China Earthquake Administration, Beijing, 100029, China;(3) The Institute of Crustal Dynamics, China Earthquake Administration, Beijing, 100085, China |
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| Abstract: | Numerous samples taken from one core at the Beijing plain were utilized to characterize the paleoclimatic configuration of
the study area and its possible relation to global control since the last interglaciation. We presented here a detailed grain-size
record for the full length of Late Pleistocene, along with the optical simulated luminescence (OSL) dating. Our findings revealed
that Late Pleistocene of the study area started approximately at 110 ka B.P. represented by the thick sediments of 31 m in
Changping depression. Four sedimentary cycles were outlined in the core during Late Pleistocene, corresponding to marine isotope
stage (MIS) 5 to 2. Controlled by regional geology and global climatic setting, eight paleoclimatic periods were identified
simultaneously in the study area on the time scale of 104 year, with the warm and moist climate being found at 110 — 96, 92 — 76, 67 — 56, and 28 — 18 ka B.P.. The climatic instabilities
on a millennial scale in Late Pleistocene were characterized largely by the occurrence of 6 strong Heinrich events shown by
comparatively coarse groups. These variations correlate well with those documented in the GRIP Greenland and in the Northern
Atlantic Ocean, though more complex features may exist on the long time scale. |
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| Keywords: | paleoclimatic variations 103-104 year scale oscillations grain-size analysis the Beijing plain |
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