A luminescence dating study of the sediment stratigraphy of the Lajia Ruins in the upper Yellow River valley,China |
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Affiliation: | 1. Wadia Institute of Himalayan Geology, 33 GMS Road, Dehradun, India;2. Centre for Earth Sciences, Indian Institute of Science, Bangalore 560012, India;3. HNB Garhwal University, Srinagar, Garhwal, India;4. Birbal Sahni Institute of Palaeosciences, Lucknow 226007, India;5. Physical Research Laboratory, Ahmedabad 308009, India;6. Institute of Water Policy, Lee Kuan Yew School of Public Policy, NUS, Singapore;7. Geography Department, National University of Singapore, Singapore |
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Abstract: | Pedo-sedimentological fieldwork were carried out in the Lajia Ruins within the Guanting Basin along the upper Yellow River valley. In the eolian loess-soil sections on the second river terrace in the Lajia Ruins, we find that the land of the Qijia Culture (4.20–3.95 ka BP) are fractured by several sets of earthquake fissures. A conglomerated red clay covers the ground of the Qijia Culture and also fills in the earthquake fissures. The clay was deposited by enormous mudflows in association with catastrophic earthquakes and rainstorms. The aim of this study is to provide a luminescence chronology of the sediment stratigraphy of the Lajia Ruins. Eight samples were taken from an eolian loess-soil section (Xialajia section) in the ruins for optically stimulated luminescence (OSL) dating. The OSL ages are in stratigraphic order and range from (31.94 ± 1.99) ka to (0.76 ± 0.02) ka. Combined OSL and 14C ages with additional stratigraphic correlations, a chronological framework is established. We conclude that: (1) the second terrace of the upper part of Yellow River formed 35.00 ka ago, which was followed by the accumulation of the eolian loess-soil section; and (2) the eolian loess-soil section is composed of the Malan Loess of the late last glacial (MIS-2) and Holocene loess-soil sequences. |
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Keywords: | Yellow River Guanting Basin Lajia Ruins Qijia Culture OSL |
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