Weathering of soils developed in the eolian material overlying glacial deposits in Eastern Nepal

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Details zur Publikation

Autorinnen und Autoren: Bäumler R
Zeitschrift: Soil Science
Verlag: Lippincott, Williams & Wilkins
Jahr der Veröffentlichung: 1998
Seitenbereich: 325-337
ISSN: 0038-075X
Sprache: Englisch


Abstract


We used the ratio between well crystallized Fe-oxides and total Fe (Fe(d-o)/Fe(t)) and weathering indices to study eight soils developed in eolian material overlying glacial deposits in Eastern Nepal with regard to intensity of soil development. Together with selected radiocarbon analyses and information on soil morphology, we tried to interpret the data in terms of relative and absolute age distinctions of the deposits. The results suggest no clear relationship between weathering intensity and morphostratigraphical development and the age of the geomorphic surface. We assume that this is attributable to different orographic conditions for sedimentation of the eolian dust at the study sites and to different degrees of pre-weathering of the eolian covers. However, we can show that formation of organic matter and soil development, in general, started around 2500-2800 years B.P. in the eolian cover of most soils studied. This indicates deposition of the bulk eolian sediments around 2800 years B.P. and earlier. Two soils have greater relative ages in the subsoil with respect to the weathering indices. In these soils, parts of the eolian sediments are of late glacial origin or even older. Distinct variation of soil development and weathering indices within a vertical distance of 200 m provided evidence of marginal ice.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Bäumler, Rupert Prof. Dr.
Professur für Geographie

Zuletzt aktualisiert 2018-09-08 um 05:24