DOI: 10.1016/j.palaeo.2015.09.009
论文题名: Middle Moscovian climate of eastern equatorial Pangea recorded in paleosols and fluvial architecture
作者: Opluštil S. ; Lojka R. ; Rosenau N.A. ; Strnad L. ; Sýkorová I.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 440 起始页码: 328
结束页码: 352
语种: 英语
英文关键词: Carboniferous paleoclimate
; Fluvial architectures
; Geochemistry
; Histosols
; Paleosols
; Vertisols
; Weathering indices
英文摘要: Fluvial architecture in conjunction with the morphology, petrographical, mineralogical and geochemical composition of intercalated paleosols of the Middle Moscovian upper Radnice Member of the continental Kladno-Rakovník Basin, Czech Republic, were studied in order to decipher climatic signals in the eastern Pangea region during the Late Paleozoic Ice Age. Analysis of architectural elements reveals vertical changes from strongly amalgamated channel fills of bedload-dominated braided streams, to isolated ribbon-like meandering channel fills in mud-dominated floodplain strata. The resulting large scale fining upward cycles separated by laterally widespread bounding surfaces are interpreted as having been formed in response to allocyclic processes driven by variable intensities of precipitation which affected the density of vegetation cover across the landscape and, in turn, the amount and character of sediment supply. Bedload-dominated parts of the cycles were deposited during periods of low water tables and sparse vegetation, whereas periods of maximum precipitation resulted in higher water tables and a greater density of vegetation cover, which, in turn stabilized the floodplains and fixed streams to narrow meandering/anastomosing channels in mud-dominated floodplain strata. Associated paleosols resemble modern Vertisols, which form under seasonal precipitation in modern settings. However, coeval formation of inertinite-rich peat represented by histosols and gleyed low chroma Vertisols in the stratigraphically lowest paleosol succession occurred under overlapping marginal conditions for the climatically different types of soils (i.e., under a seasonal climate where precipitation exceeds evapotranspiration for 6 to 8 months out of the year). Mean annual precipitation calculated from the geochemistry of B horizons of Vertisols (CALMAG proxy) varies between 1815 and 1730 mm/yr. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68743
Appears in Collections: 过去全球变化的重建
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作者单位: Charles University, Faculty of Sciences, Albertov 6, Praha 2, Czech Republic; Czech Geological Survey, Klárov 3/131, Praha 1, Czech Republic; Southern Methodist University, Huffington Department of Earth Sciences, 3225 Daniel Ave., Dallas, TX, United States; Institute of Rocks Structure and Mechanics, Academy of Sciences of the Czech Republic, Czech Republic
Recommended Citation:
Opluštil S.,Lojka R.,Rosenau N.A.,et al. Middle Moscovian climate of eastern equatorial Pangea recorded in paleosols and fluvial architecture[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,440