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Reconstructing cold climate paleoenvironments from micromorphological analysis of relict slope deposits (Serra da Estrela, Central Portugal)

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dc.contributor.authorNieuwendam, Alexandre
dc.contributor.authorVieira, Gonçalo
dc.contributor.authorSchaefer, Carlos
dc.contributor.authorWoronko, Barbara
dc.contributor.authorJohansson, Margareta
dc.date.accessioned2021-05-11T10:00:04Z
dc.date.available2021-05-11T10:00:04Z
dc.date.issued2020
dc.description.abstractThe paper focuses on analysis of macro- and micromorphological characteristics of relict slope deposits in Serra da Estrela (Portugal) to understand the significance of different slope processes and paleoenvironmental settings. Micromorphology is a useful sedimentology technique allowing significant advances compared to macroscopic techniques. Results show that different processes are involved in the development of the slope deposits, reflecting different environmental conditions. The main processes responsible for the emplacement of the relict slope deposits are solifluction, debris-flow and runoff, but postdepositional changes are also present. Solifluction was identified in slope deposits between 650 and 1500 m a.s.l. The common microfeatures identified are circular arrangement of grains with a core grain, rounded vesicles, vertical grains, matrix deformations and fine-grained deposits. Slope deposits above 1300 m a.s.l have a platy microstructure and coincide with the altitudinal range of the relict rock glaciers, indicating the elevation limit of permafrost. Below this altitude platy microstructures are less frequent. Slope deposits in northfacing slopes were affected by frost-induced processes in a seasonal frost regime, followed by a postdeposition illuvial phase. Debris-flow and runoff were identified in slope deposits between 680 and 1260 m a.s.l. The common microfeatures are oblique grains, grain dumps, and coarse and fine grain lineations, and banded microstructures were identified in runoff processes. Debris-flow deposits have a circular arrangement of grains without a core grain, identified in sediments in paraglacial and periglacial environments. The slope deposits show evidence of past periods of enhanced periglacial activity since the last glaciation until the Younger Dryas.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationNieuwendam, A., Vieira, G., Schaefer, C., Woronko, B., & Johansson, M. (2020). Reconstructing cold climate paleoenvironments from micromorphological analysis of relict slope deposits (Serra da Estrela, Central Portugal). Permafrost and Periglac Process, 31(4), 567–586. https://doi.org/10.1002/ppp.2054pt_PT
dc.identifier.doi10.1002/ppp.2054pt_PT
dc.identifier.issn1099-1530
dc.identifier.urihttp://hdl.handle.net/10451/47739
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherWileypt_PT
dc.relation.publisherversionhttps://onlinelibrary.wiley.com/journal/10991530pt_PT
dc.subjectMicromorphologypt_PT
dc.subjectPaleoenvironmentspt_PT
dc.subjectPeriglacial processespt_PT
dc.subjectSedimentologypt_PT
dc.subjectSlope depositspt_PT
dc.subjectSlope processespt_PT
dc.titleReconstructing cold climate paleoenvironments from micromorphological analysis of relict slope deposits (Serra da Estrela, Central Portugal)pt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F68511%2F2010/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FGEO%2F00295%2F2013/PT
oaire.citation.endPage586pt_PT
oaire.citation.issue4pt_PT
oaire.citation.startPage567pt_PT
oaire.citation.titlePermafrost and Periglacial Processespt_PT
oaire.citation.volume31pt_PT
oaire.fundingStreamSFRH
oaire.fundingStream5876
person.familyNameBrito Guapo Teles Vieira
person.givenNameGonçalo
person.identifierG-5958-2010
person.identifier.ciencia-id2519-6583-CAEA
person.identifier.orcid0000-0001-7611-3464
person.identifier.scopus-author-id7005863976
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication7039fbb2-e1f8-4c3e-80f1-603b12d33c1c
relation.isAuthorOfPublication.latestForDiscovery7039fbb2-e1f8-4c3e-80f1-603b12d33c1c
relation.isProjectOfPublication959027a6-d284-422d-8497-30a1c227813a
relation.isProjectOfPublication9010d09d-d0e3-40e4-a3da-36903b28d1ab
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