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An integrated palaeoenvironmental investigation of a 6200 year old peat sequence from Ile de la Possession, Iles Crozet, sub-Antarctica

dc.contributor.authorVan der Putten, N.
dc.contributor.authorHébard, J.-P.
dc.contributor.authorVerbruggen, C.
dc.contributor.authorVan de Vijver, B.
dc.contributor.authorDisnar, J.-R.
dc.contributor.authorSpassov, S.
dc.contributor.authorde Beaulieu, J.-L.
dc.contributor.authorDe Dapper, M.
dc.contributor.authorKeravis, D.
dc.contributor.authorHus, J.
dc.contributor.authorThouveny, N.
dc.contributor.authorFrenot, Y.
dc.coverage.temporal21st century
dc.date2008
dc.date.accessioned2016-03-07T16:16:59Z
dc.date.accessioned2021-12-09T09:53:58Z
dc.date.available2016-03-07T16:16:59Z
dc.date.available2021-12-09T09:53:58Z
dc.identifier.urihttps://orfeo.belnet.be/handle/internal/8793
dc.descriptionA 6200 year old peat sequence, cored in a volcanic crater on the sub-Antarctic Ile de la Possession (Iles Crozet), has been investigated, based on a multi-proxy approach. The methods applied are macrobotanical (mosses, seeds and fruits) and diatom analyses, complemented by geochemical (Rock-Eval6) and rock magnetic measurements. The chronology of the core is based on 5 radiocarbon dates. When combining all the proxy data the following changes could be inferred. From the onset of the peat formation (6200 cal yr BP) until ca. 5550 cal yr BP, biological production was high and climatic conditions must have been relatively warm. At ca. 5550 cal yr BP a shift to low biological production occurred, lasting until ca. 4600 cal yr BP. During this period the organic matter is well preserved, pointing to a cold and/or wet environment. At ca. 4600 cal yr BP, biological production increased again. From ca. 4600 cal yr BP until ca.4100 cal yr BP a “hollow and hummock” micro topography developed at the peat surface, resulting in the presence of a mixture of wetter and drier species in the macrobotanical record. After ca. 4100 cal yr BP, the wet species disappear and a generally drier, acidic bog came into existence. A major shift in all the proxy data is observed at ca. 2800 cal yr BP, pointing to wetter and especially windier climatic conditions on the island probably caused by an intensification and/or latitudinal shift of the southern westerly belt. Caused by a stronger wind regime, erosion of the peat surface occurred at that time and a lake was formed in the peat deposits of the crater, which is still present today.
dc.languageeng
dc.publisherIRM
dc.publisherKMI
dc.publisherRMI
dc.titleAn integrated palaeoenvironmental investigation of a 6200 year old peat sequence from Ile de la Possession, Iles Crozet, sub-Antarctica
dc.typeArticle
dc.subject.frascatiEarth and related Environmental sciences
dc.audienceGeneral Public
dc.audienceScientific
dc.subject.freePalaeoecology
dc.subject.freePalaeoclimate
dc.subject.freeMacrofossil record
dc.subject.freeRock magnetism
dc.subject.freeGeochemical analysis
dc.subject.freeDiatoms
dc.subject.freeIles Crozet
dc.subject.freeSub-Antarctic
dc.subject.freeHolocene
dc.source.issue0
dc.source.pagep. 179-195
Orfeo.peerreviewedNot pertinent


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