Fission-track datings and geomorphic evidences for long-term stability in the Central Cordillera highlands, Colombia

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dc.citation.journalTitleZeitschfrift Für Geomorphologie, Supplementband
dc.contributor.authorToro, G.
dc.contributor.authorHermelin, M.
dc.contributor.authorSchwabe, E.
dc.contributor.authorPosada, B.O.
dc.contributor.authorSilva, D.
dc.contributor.authorPoupeau, G.
dc.contributor.departmentUniversidad EAFIT. Departamento de Cienciasspa
dc.contributor.researchgroupGeología Ambiental y Tectónicaspa
dc.creatorToro, G.
dc.creatorHermelin, M.
dc.creatorSchwabe, E.
dc.creatorPosada, B.O.
dc.creatorSilva, D.
dc.creatorPoupeau, G.
dc.date.accessioned2021-03-26T21:25:55Z
dc.date.available2021-03-26T21:25:55Z
dc.date.issued2006-01-01
dc.description.abstractAge of weathered andesitic volcanic ash layers, which cover most of the landscape in the Central Cordillera northern massif plateaus in Colombia, were determined through the use of fission track counting in volcanic zircon crystals. A stoneline, exposed in many outcrops, which corresponds to the lower limit of younger tephras, gave ages between 350 ka and 440 ka. Andosols lying above the stoneline could not be dated. Paleolake deposits in the study area and surroundings were dated at about 2 Ma; older ashes deposited on the Rio Negro erosion surface (SII) below the stoneline level gave ages between 3.4 and 5.4 Ma. The study area is located about 150 km from the volcanic center. The ash layers decrease in thickness only slightly with distance, as perceived from profiles sampled in flat areas. We conclude that the only noticeable erosional event in the region was the emplacement of the stone-line. This erosion event which was relatively short and mild in intensity, as part of the underlying soil derived from quartzdiorite was preserved. This soil formed above a saprolite with a thickness which may reach 150 m, a fact which supports the inference that the plateaus have been stable for millions of years, in contrast to the high erosion rates observed in the surrounding steep slopes and canyons. © 2006 Gebrüder Borntraeger.eng
dc.identifierhttps://eafit.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=1882
dc.identifier.issn0442798
dc.identifier.otherSCOPUS;2-s2.0-38849124948
dc.identifier.urihttp://hdl.handle.net/10784/27230
dc.languageeng
dc.language.isoengeng
dc.publisherGebruder Borntraeger Verlagsbuchhandlung
dc.relation.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-38849124948&partnerID=40&md5=dc499f0c4e67c69960b753ba08768784
dc.rightsGebruder Borntraeger Verlagsbuchhandlung
dc.sourceZeitschfrift Für Geomorphologie, Supplementband
dc.subjectandesiteeng
dc.subjectAndosoleng
dc.subjectemplacementeng
dc.subjecterosion rateeng
dc.subjectfission track datingeng
dc.subjectgeomorphologyeng
dc.subjectlacustrine depositeng
dc.subjectlong-term changeeng
dc.subjectsaproliteeng
dc.subjecttephraeng
dc.subjectvolcanic asheng
dc.subjectzirconeng
dc.subjectColombiaeng
dc.subjectCordillera Central [Colombia]eng
dc.subjectSouth Americaeng
dc.titleFission-track datings and geomorphic evidences for long-term stability in the Central Cordillera highlands, Colombiaeng
dc.typearticleeng
dc.typeinfo:eu-repo/semantics/articleeng
dc.typeinfo:eu-repo/semantics/publishedVersioneng
dc.typepublishedVersioneng
dc.type.localArtículospa

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