Origin, weathering and paleoclimatic significance of Middle-Late Pleistocene slope covers, Mt. Kenya, Kenya

• Autorzy: Mahaney William C. , Hancock Ronald G. V.

Identyfikatory

DOI

10.24425/sq.2021.136833

• Języki publikacji: EN

Abstrakty

EN

Stacks of the Pleistocene tills and associated airfall/slopewash/colluvial sediment abound on East African Mountains but few localities exist where thick deposits of middle to Late Pleistocene age can be studied to bedrock with topography the main soil-forming agent over <0.8 Ma. Two tills form the main structure of the catena, the oldest buried in the crest, backslope and footslope of the deposit, the youngest forming the crest and upper backslope, with massive colluvial infill forming a still younger sediment mass superposed on older sediment in the lower backslope, footslope and toeslope, the latter all radiocarbon dated to within the last glaciation (Liki on Mt. Kenya; Weichselian in Europe, Wisconsin in North America). The moraine stack, first identified by J.W. Gregory in the late 19^th century, as belonging to the 'Older Glaciation' (Illinoian in North America; Teleki on Mt. Kenya), is much older than originally thought with tills and other paraglacial sediment extending to saprolitic bedrock, paleomagnetic assessment and relative weathering indices placing the mass in the Brunhes Chron. These results demonstrate that despite erosion and weathering, paleosols in toposequences near the margins of successive glaciations retain properties allowing reconstruction of environmental changes over long periods of time.

Słowa kluczowe

EN

paleosol catena; long-weathering sequence; 14C dating; MIS 2; MIS 3; marine isotope stage; sediment bed; test of Fe-Al extractions; weathering unconformity

• Wydawca: Institute of Geological Science Polish Academy of Science
• Czasopismo: Studia Quaternaria
• Rocznik: 2022
• Tom: Vol. 39, Nr 2
• Strony: 51--81
• Opis fizyczny: Bibliogr. 79 poz., rys., tab.

Twórcy

autor

Mahaney William C.

• Quaternary Surveys, 26 Thornhill Ave., Thornhill, Ontario, Canada, L4J1J4
• Department of Geography, York University, 4700 Keele St. N. York, Ontario, Canada, M3J 1P3

autor

Hancock Ronald G. V.

• Department of Anthropology, McMaster University, Hamilton, Ontario, Canada, L8S 4K1

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