DOI: 10.1016/j.palaeo.2014.10.018
论文题名: Paleoclimatic interpretations of buried paleosols within the pre-Illinoian till sequence in northern Missouri, USA
作者: Rovey C.W. ; II ; Balco G.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 417 起始页码: 44
结束页码: 56
语种: 英语
英文关键词: Central North America
; Missouri
; Paleoclimate
; Paleosol
; Pedogenesis
; Pleistocene
英文摘要: Northern Missouri preserves shallow buried paleosols ranging in age from Early to Late Pleistocene that are developed in six pre-Illinoian tills beneath Illinoian (MIS 6) and Wisconsinan (MIS 4-2) loess. The morphology of these paleosols changes with age, reflecting a changing climate during the Pleistocene, and cosmogenic-nuclide burial dates of the respective sola provide age control on the timing of these changes.The depth to secondary calcium carbonate nodules within the weathering profiles increases with younger age, indicating a transition to moister conditions during the Pleistocene, and these nodules are absent entirely within the modern soils. After approximately 0.4. Ma, the sola became distinctly redder, even as the time available for pedogenesis became shorter, culminating in the bright red Sangamon Geosol (MIS 5). This trend is consistent with increasing interglacial temperatures and/or precipitation. Finally, erosion rates determined from cosmogenic-nuclide concentrations within the sola also increase systematically with younger age. This increase may be due to some combination of changing climate, more-frequent glaciations and the deposition of a thick cover of unconsolidated glacial sediment above the stable residuum-dominated preglacial landscape. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69135
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Department of Geography, Geology and Planning, Missouri State University, 901 S. National, Springfield, MO, United States; Berkeley Geochronology Center, 2455 Ridge Road, Berkeley, CA, United States
Recommended Citation:
Rovey C.W.,II,Balco G.. Paleoclimatic interpretations of buried paleosols within the pre-Illinoian till sequence in northern Missouri, USA[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,417