DOI: 10.1016/j.palaeo.2017.05.030
论文题名: Geochemical characterization of the middle and late Pleistocene alluvial fan-dominated infill of the northern part of the Weihe Basin, Central China
作者: 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.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
卷: 482 起始页码: 57
结束页码: 69
语种: 英语
英文关键词: Authigenic carbonate
; Climate change
; Element geochemistry
; Loss-on-ignition
; Mineralogy
英文摘要: 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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/67787
Appears in Collections: 过去全球变化的重建
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作者单位: School of Geography Science, Nanjing Normal University, Nanjing, China; Department of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, Netherlands; TNO Geological Survey of the Netherlands, Utrecht, Netherlands; College of Tourism and Environment, Shaanxi Normal University, China; Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, Beijing, China; Kunming branch, Chinese Academy of Sciences, China; School of Resource, Environment and Earth Science, Yunnan University, Kunming, China
Recommended Citation:
Rits D.S.,Beets C.J.,Prins M.A.,et al. Geochemical characterization of the middle and late Pleistocene alluvial fan-dominated infill of the northern part of the Weihe Basin, Central China[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01,482