Tectonic and climate driven fluctuations in the stratigraphic base level of a Cenozoic continental coal basin, northwestern Andes

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dc.citation.journalTitleJournal Of South American Earth Sciences
dc.contributor.authorTamayo, J. C. Silva
dc.contributor.authorSierra, G. M.
dc.contributor.authorCorrea, L. G.
dc.contributor.departmentUniversidad EAFIT. Departamento de Cienciasspa
dc.contributor.researchgroupGeología Ambiental y Tectónicaspa
dc.creatorTamayo, J. C. Silva
dc.creatorSierra, G. M.
dc.creatorCorrea, L. G.
dc.date.accessioned2021-03-26T21:25:56Z
dc.date.available2021-03-26T21:25:56Z
dc.date.issued2008-12-01
dc.description.abstractChanges in the sedimentologic and stratigraphic characteristics of the coal-bearing middle Oligocene-late Miocene siliciclastic Amagá Formation, northwestern Colombia, reflect major fluctuations in the stratigraphic base level within the Amagá Basin, which paralleled three major stages of evolution of the middle Cenozoic Andean Orogeny. These stages, which are also traceable by the changes in the compositional modes of sandstones, controlled the occurrence of important coal deposits. The initial stage of evolution of the Amagá Basin was related to the initial uplift of the Central Cordillera of Colombia around 25 Ma, which promoted moderate subsidence rates and high rates of sediment supply into the basin. This allowed the development of aggradational braided rivers and widespread channel amalgamation resulting in poor preservation of both, low energy facies and geomorphic elements. The presence of poorly preserved Alfisols within the scarce flood plains and the absence of swamp deposits suggest arid climate during this stage. The compositional modes of sandstones suggest sediment supply from uplifted basement-cored blocks. The second stage of evolution was related to the late Oligocene eastward migration of the Pre-Andean tholeitic magmatic arc from the Western Cordillera towards the Cauca depression. This generated extensional movements along the Amagá Basin, enhancing the subsidence and increasing the accommodation space along the basin. As a result of the enhanced subsidence rates, meandering rivers developed, allowing the formation of extensive swamps deposits (currently coal beds). The excellent preservation of Entisols and Alfisols within the flood plain deposits suggests rapid channels migration and a humid climate during deposition. Moderate to highly mature channel sandstones support this contention, and point out the Central Cordillera of Colombia as the main source of sediment. Enhanced subsidence during this stage also prevented channels amalgamation and promoted both, high preservation of geomorphic elements and high diversity of sedimentary facies. This resulted in the most symmetric stratigraphic cycles of the entire Amagá Formation. The final stage of evolution of the Amagá Basin was related to the early stage of development of the late Miocene northwestern Andes tholeitic volcanism (from ~10 to ~8 Ma). The extensive thrusting and folding associated to this volcanism reduced the subsidence rates along the basin and thus the accommodation space. This permitted the development of highly aggradational braided rivers and promoted channels amalgamation. Little preservation of low energy facies, poor preservation of the geomorphic elements and a complete obliteration of important swamp deposits (coal beds) within the basin are reflected by the most asymmetric stratigraphic cycles of the whole formation. The presence of greenish/reddish flood plain deposits and Alfisols suggests a dry climate during this depositional stage. The presence of channel sandstones with high contents of volcanic rock fragments supports a dry climate, and suggests an incipient phase of the Combia tholeiitic magmatism present during deposition of the Amagá Formation. The subsequent eastward migration of the NW Andes magmatic arc (after ~8 Ma) may have produced basin inversion and suppressed deposition along the Amagá Basin. © 2008 Elsevier Ltd. All rights reserved.eng
dc.identifierhttps://eafit.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=2101
dc.identifier.doi10.1016/j.jsames.2008.02.001
dc.identifier.issn08959811
dc.identifier.issn18730647
dc.identifier.otherWOS;000261847000003
dc.identifier.otherSCOPUS;2-s2.0-56349085464
dc.identifier.urihttp://hdl.handle.net/10784/27232
dc.languageeng
dc.language.isoengeng
dc.publisherPERGAMON-ELSEVIER SCIENCE LTD
dc.relation.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-56349085464&doi=10.1016%2fj.jsames.2008.02.001&partnerID=40&md5=3fc3fe8999070fb38f4f9f9398b7dc1f
dc.rightshttps://v2.sherpa.ac.uk/id/publication/issn/0895-9811
dc.sourceJournal Of South American Earth Sciences
dc.subjectAndean orogenyeng
dc.subjectbasin evolutioneng
dc.subjectCenozoiceng
dc.subjectcoaleng
dc.subjectextensional tectonicseng
dc.subjectfoldingeng
dc.subjectinversion tectonicseng
dc.subjectsequence stratigraphyeng
dc.subjectsubsidenceeng
dc.subjecttectonic evolutioneng
dc.subjectthrusteng
dc.subjectuplifteng
dc.subjectvolcanismeng
dc.subjectAmaga Basineng
dc.subjectAndeseng
dc.subjectAntioquia [Colombia]eng
dc.subjectColombiaeng
dc.subjectCordillera Central [Andes]eng
dc.subjectSouth Americaeng
dc.titleTectonic and climate driven fluctuations in the stratigraphic base level of a Cenozoic continental coal basin, northwestern Andeseng
dc.typearticleeng
dc.typeinfo:eu-repo/semantics/articleeng
dc.typeinfo:eu-repo/semantics/publishedVersioneng
dc.typepublishedVersioneng
dc.type.localArtículospa

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