Aeolian activity in northern Amazonia:optical dating of Late Pleistocene and Holocene palaeodunes

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dc.contributor.authorTeeuw, Richard
dc.contributor.authorRhodes, Edward
dc.date.accessioned2015-12-13T22:29:17Z
dc.date.available2015-12-13T22:29:17Z
dc.date.issued2004
dc.date.updated2015-12-11T08:47:46Z
dc.description.abstractPalaeodunes were examined on the eastern margin of the Rio Branco-Rupununi savanna, northeast Amazonia. Optical dating suggests that the onset of aeolian activity was between 17 000 and 15 000 yr ago, just after the Last Glacial Maximum. Both the palaeodune axes and modern dominant wind directions have northeast to east-northeast directions, implying no significant shift in atmospheric circulation patterns over northeast Amazonia during the Late Pleistocene to Holocene. Major regional climate change events, such as the Younger Dryas, do not appear to have had any effect on the rates of aeolian deposition at the study site. Aeolian activity appears to have continued to the present day, showing a remarkably constant deposition rate of around 0.13 m kyr-1 initially, increasing smoothly to the present. Until more palaeodunes in northern Amazonia are dated, it is impossible to determine if this record of gradual aeolian deposition is a reliable regional palaeoclimate indicator, rather than being the result of local bioclimatic and geomorphological effects.
dc.identifier.issn0267-8179
dc.identifier.urihttp://hdl.handle.net/1885/74620
dc.publisherWiley-VCH Verlag GMBH
dc.sourceJournal of Quaternary Science
dc.subjectKeywords: chronology; dune field; eolian deposit; Holocene; luminescence; paleoenvironment; Pleistocene; sedimentation; Amazonia; South America Aeolian activity; Amazonia; Optical dating; Optically stimulated luminescence (OSL); Palaeodunes; Pleistocene-Holocene
dc.titleAeolian activity in northern Amazonia:optical dating of Late Pleistocene and Holocene palaeodunes
dc.typeJournal article
local.bibliographicCitation.issue1
local.bibliographicCitation.lastpage54
local.bibliographicCitation.startpage49
local.contributor.affiliationTeeuw, Richard, University of Portsmouth
local.contributor.affiliationRhodes, Edward, College of Physical and Mathematical Sciences, ANU
local.contributor.authoremailrepository.admin@anu.edu.au
local.contributor.authoruidRhodes, Edward, u4065999
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.absfor040601 - Geomorphology and Regolith and Landscape Evolution
local.identifier.ariespublicationMigratedxPub4211
local.identifier.citationvolume19
local.identifier.doi10.1002/jqs.815
local.identifier.scopusID2-s2.0-1242310254
local.identifier.uidSubmittedByMigrated
local.type.statusPublished Version

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