DOI: 10.1016/j.earscirev.2020.103410
论文题名: Identifying eolian dust in the geological record
作者: Meijer N. ; Dupont-Nivet G. ; Licht A. ; Trabucho-Alexandre J. ; Bourquin S. ; Abels H.A.
刊名: Earth Science Reviews
ISSN: 00128252
出版年: 2020
卷: 211 语种: 英语
中文关键词: Loess
; Loessite
; Mineral dust
英文关键词: alluvial deposit
; eolian deposit
; geological record
; loess
; mineral dust
; sediment transport
; sedimentology
; China
; Loess Plateau
英文摘要: Recognition of terrestrial dust in geological records is essential for reconstructing paleoenvironments and quantifying dust fluxes in the past. However, in contrast to eolian sands, silt-sized dust is difficult to recognize in pre-Quaternary records due to a lack of macroscopic features indicating eolian transport and mixing with alluvial sediments. Windblown dust deposits are commonly identified by comparing their sedimentological and petrological features with Quaternary examples of dust known as loess. Here, we review the characteristics of terrestrial dust deposits and conclude that most of these features are not exclusively windblown and may be formed by alluvial deposits as well. We therefore synthesize a set of criteria which enable a reliable identification and quantification of dust while acknowledging potential contributions of alluvial components. These methods include quartz-grain surface morphology analysis to distinguish eolian and alluvial transport modes, provenance studies to identify local and extrabasinal sources, grain-size-shape end-member modelling to quantify the various sedimentary contributions to the record, and a basin-scale stratigraphic approach to derive regional patterns and avoid interpretation of local phenomena. We reassess the Eocene to Pliocene records of the Chinese Loess Plateau and conclude that these strata represent both alluvial and eolian sediments deposited in extensive mudflat systems. Quaternary loess, by contrast, is almost exclusively composed of windblown dust. The early Pleistocene shift from mudflat to loess deposits is associated with a significant increase in accumulation rates, likely due to increased dust production upwind, overwhelming and blanketing the local mudflat systems in central China. © 2020 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/166182
Appears in Collections: 气候变化与战略
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作者单位: Institute for Geosciences, Universität Potsdam, Potsdam, 14476, Germany; Univ Rennes, CNRS, Géosciences Rennes - UMR CNRS 6118, Rennes, F-35000, France; Key Laboratory of Orogenic Belts and Crustal Evolution, Ministry of Education, School of Earth and Space Sciences, Peking University, Beijing, 100871, China; Department of Earth and Space Sciences, University of Washington, Seattle, WA 98195, United States; Department of Earth Sciences, Universiteit Utrecht, P.O. Box 80115, Utrecht, 3508 TC, Netherlands; Department of Geosciences and Engineering, Delft University of Technology, Delft, 2628 CN, Netherlands
Recommended Citation:
Meijer N.,Dupont-Nivet G.,Licht A.,et al. Identifying eolian dust in the geological record[J]. Earth Science Reviews,2020-01-01,211