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dc.contributor.authorSmith, Carolen
dc.contributor.authorHughes, M.en
dc.contributor.authorTonkin, P.en
dc.date.accessioned2011-10-31T23:54:09Z
dc.date.issued2010-08en
dc.identifier.citationSmith, C., Hughes, M. W., Almond, P. J., & Tonkin, P. J. (2010). Micromorphology of a welded paleosol in the Dillondale loess, Charwell Basin, South Island, New Zealand. In R. J. Gilkes & N. Prakongkep (Eds.), Soil Solutions for a Changing World: Proceedings of the 19th World Congress of Soil Science, Brisbane, Australia, 1-6 August 2010. Symposium 1.6.1 Impact of aeolian sediments on pedogenesis (pp. 29-32). Brisbane, Australia: IUSS.en
dc.identifier.isbn978-0-646-53783-2en
dc.identifier.urihttps://hdl.handle.net/10182/3984
dc.description.abstractMicromorphological evidence and soil phosphorus chemical data supporting the presence of a welded paleosol from the Dillondale loess are presented. Since both topdown and upbuilding pedogenesis can occur in loess deposits, welding of paleosols will occur when topdown pedogenesis overprints an existing paleosol. Intact soil samples were collected and their micromorphology described, and soil P fractions were determined. The micromorphology and soil P fractions provide strong evidence for a welded soil between 3.0 and 4.0 m depth (L3b basal unit). Throughout this unit the b-fabric is both porostriated and granostriated; amorphous concentration features are moderately to strongly impregnated, postdating clay cutans. We interpret this to reflect greater mechanical stress on the clay domains and hence a longer period of topdown pedogenesis. Low levels of PCa and a high proportion of POcc in the L3b basal unit imply these are highly weathered horizons. This suggests two phases of topdown pedogenesis during a hiatus in loess accretion. We propose that an extended period of illuvial clay deposition in the underlying b2Btg1 and b2Btg2 horizons occurred, reducing macropore continuity in the horizons above. Intense anaerobic conditions would have resulted, with the onset of gleying and the formation of the amorphous concentration pedofeatures.en
dc.format.extent29-32en
dc.language.isoenen
dc.publisherInternational Union of Soil Scienceen
dc.relationThe original publication is available from - International Union of Soil Scienceen
dc.rights© 2010 19th World Congress of Soil Science, Soil Solutions for a Changing World. Archived with publisher permission.en
dc.source19th World Congress of Soil Scienceen
dc.subjectmicromorphologyen
dc.subjectwelded paleosolen
dc.subjectloessen
dc.subjectpedogenesisen
dc.subjectpedofeaturesen
dc.titleMicromorphology of a welded paleosol in the Dillondale loess, Charwell Basin, South Island, New Zealanden
dc.typeConference Contribution - Published
lu.contributor.unitLincoln Universityen
lu.contributor.unitFaculty of Agriculture and Life Sciencesen
lu.contributor.unitDepartment of Soil and Physical Sciencesen
lu.contributor.uniten
lu.contributor.uniten
pubs.finish-date2010-08-06en
pubs.notesPaper presented at the 19th World Congress of Soil Science, Soil Solutions for a Changing World, Brisbane, Australia, 1-6 August 2010.en
pubs.organisational-group/LU
pubs.organisational-group/LU/Agriculture and Life Sciences
pubs.organisational-group/LU/Agriculture and Life Sciences/SOILS
pubs.organisational-group/LU/Research Management Office
pubs.organisational-group/LU/Research Management Office/2018 PBRF Staff group
pubs.publication-statusPublisheden
pubs.start-date2010-08-01en
lu.identifier.orcid0000-0002-6810-3546
lu.subtypeConference Paperen


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