Sinifaná metasedimentites and relations with cajamarca paragneisses of the central cordillera of colombia

The western flank of Colombia’s Central Cordillera is characterized by N-S elongated tectonic blocks within the continental-scale Romeral and Cauca fault system. One of these blocks comprises the slates, metasandstones and quartzites of the Sinifaná Metasedimentites along with the intrusive Amagá gr...

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Autores:
Martens, Uwe C.
Restrepo Álvarez, Jorge Julián
Solari, Luigi A.
Tipo de recurso:
Article of journal
Fecha de publicación:
2012
Institución:
Universidad Nacional de Colombia
Repositorio:
Universidad Nacional de Colombia
Idioma:
spa
OAI Identifier:
oai:repositorio.unal.edu.co:unal/71051
Acceso en línea:
https://repositorio.unal.edu.co/handle/unal/71051
http://bdigital.unal.edu.co/35521/
Palabra clave:
U-Pb geochronology
Detrital zircons
Tahamí terrane
Margin Segmentation
Rights
openAccess
License
Atribución-NoComercial 4.0 Internacional
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oai_identifier_str oai:repositorio.unal.edu.co:unal/71051
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repository_id_str
dc.title.spa.fl_str_mv Sinifaná metasedimentites and relations with cajamarca paragneisses of the central cordillera of colombia
title Sinifaná metasedimentites and relations with cajamarca paragneisses of the central cordillera of colombia
spellingShingle Sinifaná metasedimentites and relations with cajamarca paragneisses of the central cordillera of colombia
U-Pb geochronology
Detrital zircons
Tahamí terrane
Margin Segmentation
title_short Sinifaná metasedimentites and relations with cajamarca paragneisses of the central cordillera of colombia
title_full Sinifaná metasedimentites and relations with cajamarca paragneisses of the central cordillera of colombia
title_fullStr Sinifaná metasedimentites and relations with cajamarca paragneisses of the central cordillera of colombia
title_full_unstemmed Sinifaná metasedimentites and relations with cajamarca paragneisses of the central cordillera of colombia
title_sort Sinifaná metasedimentites and relations with cajamarca paragneisses of the central cordillera of colombia
dc.creator.fl_str_mv Martens, Uwe C.
Restrepo Álvarez, Jorge Julián
Solari, Luigi A.
dc.contributor.author.spa.fl_str_mv Martens, Uwe C.
Restrepo Álvarez, Jorge Julián
Solari, Luigi A.
dc.subject.proposal.spa.fl_str_mv U-Pb geochronology
Detrital zircons
Tahamí terrane
Margin Segmentation
topic U-Pb geochronology
Detrital zircons
Tahamí terrane
Margin Segmentation
description The western flank of Colombia’s Central Cordillera is characterized by N-S elongated tectonic blocks within the continental-scale Romeral and Cauca fault system. One of these blocks comprises the slates, metasandstones and quartzites of the Sinifaná Metasedimentites along with the intrusive Amagá granitic Stock. Zircon U-Pb detrital geochronology was conducted on a Sinifaná metaquartzite taken ca. 40 km southwest of Medellin. The main population yielded 640–500 Ma ages, typical of the Pan African-Brasiliano event and suggestive of Gondwanan provenance. The sample also yielded minor Proterozoic ages and the three youngest detrital zircons yielded 325–290 Ma ages. Taking into account the intrusive but unmetamorphosed character of the ca. 230 Ma Amagá Stock, we conclude that deposition of Sinifaná terrigenous rocks and their metamorphism occurred between the late Carboniferous and earliest Triassic.Sinifaná detrital-zircon populations are analogous to inherited zircon in Cajamarca migmatites and paragneisses from Las Palmas, near Medellin, which constitute the basement of the Tahamí terrane. This feature suggests a link between these high-grade metasedimentary rocks and the low grade metasedimentary rocks of the relatively small Sinifaná block. Metamorphic rims yielding 220–250 Ma, which are ubiquitous in Las Palmas, are absent in Sinifaná, probably due to very-low-grade metamorphism not producing zircon recrystallization. We propose that the tectonic block containing the Sinifaná metasedimentites may have broken away from a continental margin that once included both the Tahamí and other smaller pieces such as the Sinifaná. The age of tectonic departure is constrained by the block comprising the early Cretaceous Quebradagrande complex, which is currently positioned between the Tahamí and Sinifaná.
publishDate 2012
dc.date.issued.spa.fl_str_mv 2012
dc.date.accessioned.spa.fl_str_mv 2019-07-03T14:14:58Z
dc.date.available.spa.fl_str_mv 2019-07-03T14:14:58Z
dc.type.spa.fl_str_mv Artículo de revista
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dc.relation.ispartof.spa.fl_str_mv Universidad Nacional de Colombia Revistas electrónicas UN Boletín Ciencias de la Tierra
Boletín Ciencias de la Tierra
dc.relation.ispartofseries.none.fl_str_mv Boletín Ciencias de la Tierra; núm. 32 (2012); 99-110 0120-3630
dc.relation.references.spa.fl_str_mv Martens, Uwe C. and Restrepo Álvarez, Jorge Julián and Solari, Luigi A. (2012) Sinifaná metasedimentites and relations with cajamarca paragneisses of the central cordillera of colombia. Boletín Ciencias de la Tierra; núm. 32 (2012); 99-110 0120-3630 .
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spelling Atribución-NoComercial 4.0 InternacionalDerechos reservados - Universidad Nacional de Colombiahttp://creativecommons.org/licenses/by-nc/4.0/info:eu-repo/semantics/openAccesshttp://purl.org/coar/access_right/c_abf2Martens, Uwe C.848f8d34-8c0b-4404-845b-9835e67a29f7300Restrepo Álvarez, Jorge Julián9f5e9b19-87c8-46ce-93a5-91957a117c95300Solari, Luigi A.fe57b5b7-6ea8-4b4d-9c81-1e282cfbfe5b3002019-07-03T14:14:58Z2019-07-03T14:14:58Z2012https://repositorio.unal.edu.co/handle/unal/71051http://bdigital.unal.edu.co/35521/The western flank of Colombia’s Central Cordillera is characterized by N-S elongated tectonic blocks within the continental-scale Romeral and Cauca fault system. One of these blocks comprises the slates, metasandstones and quartzites of the Sinifaná Metasedimentites along with the intrusive Amagá granitic Stock. Zircon U-Pb detrital geochronology was conducted on a Sinifaná metaquartzite taken ca. 40 km southwest of Medellin. The main population yielded 640–500 Ma ages, typical of the Pan African-Brasiliano event and suggestive of Gondwanan provenance. The sample also yielded minor Proterozoic ages and the three youngest detrital zircons yielded 325–290 Ma ages. Taking into account the intrusive but unmetamorphosed character of the ca. 230 Ma Amagá Stock, we conclude that deposition of Sinifaná terrigenous rocks and their metamorphism occurred between the late Carboniferous and earliest Triassic.Sinifaná detrital-zircon populations are analogous to inherited zircon in Cajamarca migmatites and paragneisses from Las Palmas, near Medellin, which constitute the basement of the Tahamí terrane. This feature suggests a link between these high-grade metasedimentary rocks and the low grade metasedimentary rocks of the relatively small Sinifaná block. Metamorphic rims yielding 220–250 Ma, which are ubiquitous in Las Palmas, are absent in Sinifaná, probably due to very-low-grade metamorphism not producing zircon recrystallization. We propose that the tectonic block containing the Sinifaná metasedimentites may have broken away from a continental margin that once included both the Tahamí and other smaller pieces such as the Sinifaná. The age of tectonic departure is constrained by the block comprising the early Cretaceous Quebradagrande complex, which is currently positioned between the Tahamí and Sinifaná.application/pdfspaUniversidad Nacional de Colombiahttp://revistas.unal.edu.co/index.php/rbct/article/view/35878Universidad Nacional de Colombia Revistas electrónicas UN Boletín Ciencias de la TierraBoletín Ciencias de la TierraBoletín Ciencias de la Tierra; núm. 32 (2012); 99-110 0120-3630Martens, Uwe C. and Restrepo Álvarez, Jorge Julián and Solari, Luigi A. (2012) Sinifaná metasedimentites and relations with cajamarca paragneisses of the central cordillera of colombia. 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