Quartz OSL chronology and dust accumulation rate changes since the Last Glacial at Weinan on the southeastern Chinese Loess Plateau

摘要: The fine-grained (4–11 μm) quartz Optically Stimulated Luminescence (OSL) dating technique was applied to the Weinan section on southeastern Chinese Loess Plateau (CLP) with a high luminescence sampling resolution (10- and 20-cm intervals). Fifty-eight OSL ages, spanning c. 1–74 ka, were obtained for 10-m loess–palaeosol sequences. reliability of constructed chronology confirmed by comparing ages independent dates from other studies correlation palaeoclimatic time series. closely spaced at indicate that mean dust accumulation rate (DAR) L1–1 (MIS 2, 7.0±0.9 cm ka−1) is lower than those L1–3 4, 19.1±6.1 cm ka−1) L1–2 3, 16.0±0.7 cm ka−1) DAR c. 30–20 ka ago (11.4±2.4 cm ka−1) higher 20–10 ka (3.0±0.1 cm ka−1) in L1–1. subsequent calculation mass (MAR) indicates MAR (107 g m−2 a−1) much (247 g m−2 a−1) (307 g m−2 a−1). By DAR results during Last Glacial further six sites studies, we observed (lower) eastern (western) CLP, MIS 2 has an evident transition low 20 ka entire CLP. Possible mechanisms above changes orbital sub-orbital scales are presented.