Print Email Facebook Twitter Geochemical characterization of the middle and late Pleistocene alluvial fan-dominated infill of the northern part of the Weihe Basin, Central China Title Geochemical characterization of the middle and late Pleistocene alluvial fan-dominated infill of the northern part of the Weihe Basin, Central China Author Rits, D.S. Beets, C.J. Prins, M.A. van Balen, R.T. Troelstra, S.R. Luo, C. Wang, B. Li, X. Zhou, J. Zheng, H. Publication year 2017 Abstract Major reorganizations in climate and tectonic regime occurred in East Asia during the Pleistocene, resulting in large-scale environmental changes. In this paper a detailed geochemical and mineralogical record of these changes is presented from a distal alluvial fan sedimentary sequence in the northern Weihe Basin. We established that, in addition to glacial-interglacial variation, there are three distinctly different units deposited over the past 1 m.y. These units are the result of variations in the overall tectonic regime in the northern Weihe Basin. Fine-grained detrital minerals were predominantly delivered during colder climatic periods, whereas evaporative minerals were dominantly deposited during the warmer, interglacial periods, probably as a result of strong seasonal contrast. This compositional variation demonstrates the importance of climate control on hinterland erosion, surface runoff, chemical weathering and evaporation. Al-normalized ratios of indicative major elements relative to average loess composition, indicate important variations in sedimentary processes, mostly related to sediment flux. Si-enrichment is an index for past flooding events, while Fe enrichment, just like K and Ti, reflects influx of clays. In contrast, Ca and Mn are strongly enriched throughout the core, associated with the authigenic precipitation of carbonates, especially during interglacial periods. The lower (~ 1000–690 ka) and upper (~ 330–0 ka) units of the core are characterized by relative intense and frequent flooding, which coincided with extensive ponding in the study area. In the middle unit (~ 690–330 ka) increased salinity levels caused by evaporation, as reflected in the high Sr/Ca ratio and dolomite abundance, led to increased carbonate precipitation. Simultaneously, the increased influx of fine sediments indicates increased clay production in the source area as a result of a more intense summer monsoon strength after 600 ka. © 2017 Elsevier B.V. Subject 2015 GeoGM - GeomodellingELSS - Earth, Life and Social SciencesGeological Survey NetherlandsGeosciences2015 EnergyAuthigenic carbonateClimate changeElement geochemistryLoss-on-ignitionMineralogy To reference this document use: http://resolver.tudelft.nl/uuid:e52c8501-e116-41d8-a87f-263c367a256f DOI https://doi.org/10.1016/j.palaeo.2017.05.030 TNO identifier 766518 Publisher Elsevier B.V. ISSN 0031-0182 Source Palaeogeography, Palaeoclimatology, Palaeoecology, 482, 57-69 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.