Thermochronological, petrographic and geochemical characteristics of the Combia Formation, Amagá basin, Colombia

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dc.citation.journalTitleJournal Of South American Earth Sciences
dc.contributor.authorBernet M.
dc.contributor.authorMesa Garcia J.
dc.contributor.authorChauvel C.
dc.contributor.authorRamírez Londoño M.J.
dc.contributor.authorMarín-Cerón M.I.
dc.contributor.departmentUniversidad EAFIT. Departamento de Cienciasspa
dc.contributor.researchgroupGeología Ambiental y Tectónicaspa
dc.creatorBernet M.
dc.creatorMesa Garcia J.
dc.creatorChauvel C.
dc.creatorRamírez Londoño M.J.
dc.creatorMarín-Cerón M.I.
dc.date.accessioned2021-03-26T21:25:57Z
dc.date.available2021-03-26T21:25:57Z
dc.date.issued2020-01-01
dc.description.abstractThe Amagá basin between the Western and Central Cordilleras of the Northern Andes of Colombia hosts the Neogene volcanic and volcaniclastic Combia Formation. Deposition of the Combia Formation in relation to Nazca plate subduction and arc volcanism is still a matter of debate. Therefore, the timing, petrography and geochemical characteristics of Combia Formation rocks were studied in the western and eastern parts of the Amagá basin, in order to gain more information on the type of magma generation and volcanic activity that led to the deposition of the Combia Formation. Apatite and zircon fission-track dating largely confirm a 12-6 Ma age for the deposition of the Combia Formation. Petrographic and major element analyses show that mainly trachy-andesite ignimbrites with a calc-alkaline composition were deposited in the western Amagá basin, whereas the volcanic rocks of the eastern Amagá basin are lavas flow and fall-out deposits of basaltic andesites of tholeiitic affinity. Trace element and isotopic analyses show that slab dehydration and sediment melting/decarbonation were important in primary magma generation in the mantle wedge, but the primary magma was mixed with lower continental crustal melts (e.g. High-Pb radiogenic), resulting in characteristic isotope signatures in the western and eastern Amagá basin. Then, the hot-zone developed a high Pb-radiogenic, garnet-bearing lower continental crustal (LCC) level as a consequence of the quantity of dehydration of the subducting slab and of changes in the tectonic regime. An extensional pull-apart event (12- 9 Ma), likely facilitated rapid magma ascend to the uppermost crust along a subvertical magma plumbing system throughout the Romeral Fault zone in the eastern Amagá basin, and calc-alkaline magmas with adakite-like signature, which may indicate contractile tectonics that allow the formation of middle-to upper-crustal magma chambers with a garnet fractionation at depth and the evolution of silicate melts into the hot zone mainly related to the amount of water (>4 wt %) present. © 2020 Elsevier Ltdeng
dc.identifierhttps://eafit.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=12157
dc.identifier.doi10.1016/j.jsames.2020.102897
dc.identifier.issn08959811
dc.identifier.issn18730647
dc.identifier.otherWOS;000600273500002
dc.identifier.otherSCOPUS;2-s2.0-85091385099
dc.identifier.urihttp://hdl.handle.net/10784/27249
dc.languageeng
dc.language.isoengeng
dc.publisherPERGAMON-ELSEVIER SCIENCE LTD
dc.relation.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-85091385099&doi=10.1016%2fj.jsames.2020.102897&partnerID=40&md5=a64b5c355df757d13f4254e8b7f6f41d
dc.rightshttps://v2.sherpa.ac.uk/id/publication/issn/0895-9811
dc.sourceJournal Of South American Earth Sciences
dc.subjectVOLCANIC-ROCKSeng
dc.subjectEQUILIBRIAeng
dc.subjectDEPOSITSeng
dc.subjectZONEeng
dc.subjectTOOLeng
dc.titleThermochronological, petrographic and geochemical characteristics of the Combia Formation, Amagá basin, Colombiaeng
dc.typearticleeng
dc.typeinfo:eu-repo/semantics/articleeng
dc.typeinfo:eu-repo/semantics/publishedVersioneng
dc.typepublishedVersioneng
dc.type.localArtículospa

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