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Mineral magnetic characterization of the Upper Pleniglacial Nussloch loess sequence (Germany): an insight into local environmental processes

Charlotte Prud’homme; Christophe Lécuyer; Pierre Antoine; Christine Hatté; Olivier Moine; François Fourel; Romain Amiot; François Martineau; Denis-Didier Rousseau

Title:
Mineral magnetic characterization of the Upper Pleniglacial Nussloch loess sequence (Germany): an insight into local environmental processes
Author(s):
Prud’homme, Charlotte
Lécuyer, Christophe
Antoine, Pierre
Hatté, Christine
Moine, Olivier
Fourel, François
Amiot, Romain
Martineau, François
Rousseau, Denis-Didier
Date:
Type:
Articles
Department(s):
Lamont-Doherty Earth Observatory
Volume:
199
Persistent URL:
Book/Journal Title:
Geophysical Journal International
Geographic Area:
Rhine River Valley
Abstract:
Presently, most loess/palaeosol magnetic susceptibility records are interpreted as following either the wind-vigour model or the pedogenic enhancement model. However redoxomorphic processes induced by waterlogging, often referred to gleying in the loess literature, are also known to alter loess deposits but their impact on loess/palaeosol magnetic susceptibility records has received little attention. The reported rock magnetic study aims to characterize the mineral magnetic response of loess to waterlogging-induced redoxomorphic processes, thus improving our understanding of mineral magnetic changes within loess deposits with respect to environmental and climate conditions. The Nussloch loess-palaeosol deposit (Rhine Valley, Germany) was targeted because it is one of the best-studied Pleniglacial deposits for Western Europe in which numerous tundra gley intervals have been identified. Moreover, a comprehensive high-resolution environmental magnetism study has never been undertaken for this site. Various rock magnetism experiments were conducted at both room and low temperatures to characterise the composition, concentration and relative magnetic grain size of the mineral magnetic assemblage. The relative changes in magnetic parameters within the investigated loess interval are primarily controlled by (1) varying concentrations of coarse-grained ferrimagnetic particles of detrital (aeolian) origin and (2) dissolution of fine-grained ferrimagnetic particles related to in situ post-depositional alteration promoted by waterlogging-induced redoxomorphic processes. Goethite is found to be ubiquitous throughout the studied interval and is argued to have both a primary (aeolian) and secondary (in situ) origin. We conclude, that redoxomorphic processes induced by waterlogging, if present, will hinder the interpretation of magnetic susceptibility variations within loess and palaeosol deposits following the expected relationships dictated by the wind-vigour and the pedogenic enhancement magnetism models.
Subject(s):
Paleomagnetism
Geomagnetism
Rocks--Magnetic properties
Loess--Environmental aspects
Publisher DOI:
https://doi.org/10.1093/gji/ggu331
Item views
10
Metadata:
text | xml
Suggested Citation:
Charlotte Prud’homme, Christophe Lécuyer, Pierre Antoine, Christine Hatté, Olivier Moine, François Fourel, Romain Amiot, François Martineau, Denis-Didier Rousseau, , Mineral magnetic characterization of the Upper Pleniglacial Nussloch loess sequence (Germany): an insight into local environmental processes, Columbia University Academic Commons, .

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