Petrologic characterization and tectonic implications of blueschist and greenschist facies rocks of Jambaló, Cauca

Jambaló greenschist and blueschist are found in a metamorphic unit that belongs to the Arquía complex. Metamorphism of these rocks is associated with the subduction of the Proto-Caribbean under the South American plate. Age of metamorphism has been estimated by Bustamante (2008) with Ar-Ar method as...

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Autores:
Carmona Mongua, Valentina
Tipo de recurso:
Trabajo de grado de pregrado
Fecha de publicación:
2017
Institución:
Universidad de los Andes
Repositorio:
Séneca: repositorio Uniandes
Idioma:
eng
OAI Identifier:
oai:repositorio.uniandes.edu.co:1992/39911
Acceso en línea:
http://hdl.handle.net/1992/39911
Palabra clave:
Geología estructural
Petrología
Esquistos
Geociencias
Rights
openAccess
License
http://creativecommons.org/licenses/by-nc-sa/4.0/
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repository_id_str
dc.title.es_CO.fl_str_mv Petrologic characterization and tectonic implications of blueschist and greenschist facies rocks of Jambaló, Cauca
title Petrologic characterization and tectonic implications of blueschist and greenschist facies rocks of Jambaló, Cauca
spellingShingle Petrologic characterization and tectonic implications of blueschist and greenschist facies rocks of Jambaló, Cauca
Geología estructural
Petrología
Esquistos
Geociencias
title_short Petrologic characterization and tectonic implications of blueschist and greenschist facies rocks of Jambaló, Cauca
title_full Petrologic characterization and tectonic implications of blueschist and greenschist facies rocks of Jambaló, Cauca
title_fullStr Petrologic characterization and tectonic implications of blueschist and greenschist facies rocks of Jambaló, Cauca
title_full_unstemmed Petrologic characterization and tectonic implications of blueschist and greenschist facies rocks of Jambaló, Cauca
title_sort Petrologic characterization and tectonic implications of blueschist and greenschist facies rocks of Jambaló, Cauca
dc.creator.fl_str_mv Carmona Mongua, Valentina
dc.contributor.advisor.none.fl_str_mv Blanco Quintero, Idael
Rodríguez Vargas, Andrés Ignacio
dc.contributor.author.none.fl_str_mv Carmona Mongua, Valentina
dc.contributor.jury.none.fl_str_mv Rojas-Agramonte, Yamirka
dc.subject.keyword.es_CO.fl_str_mv Geología estructural
Petrología
Esquistos
topic Geología estructural
Petrología
Esquistos
Geociencias
dc.subject.themes.none.fl_str_mv Geociencias
description Jambaló greenschist and blueschist are found in a metamorphic unit that belongs to the Arquía complex. Metamorphism of these rocks is associated with the subduction of the Proto-Caribbean under the South American plate. Age of metamorphism has been estimated by Bustamante (2008) with Ar-Ar method as Maastrichtian-Danian (67-61 Ma). Paragenesis of blueschist facies rocks is Glaucophane (Fe-glaucophane) + quartz + phengite + albite + epidote + chlorite (pycnochlorite) garnet, and paragenesis of greenschist facies rock is albite + quartz + chlorite (pycnochlorite) + calcite + epidote. Greenschist rocks have been altered by an infiltrating fluid with CO2, transforming the paragenesis from a paragenesis with actinolite to a paragenesis with calcite and with absence of actinolite. Protholits of theses rocks were obtained through mineral chemistry, whole rock composition and paragenesis analysis, defining a metapelitic protholit for blueschist rocks and a metabasic protholit for greenschist rocks. According to P-T conditions, both rock types reached approximately the metamorphic peak at 9.2 kbar and 481°C, which corresponds to the transitional assemblage between greenschist to blueschist facies. Petrography provides evidence of retrogression with a slight overprint of a lower facies (greenschist). However, rocks preserve their peak assemblage, indicating a hairpin retrograde path. According to this path and to lithologic relations between the studied rocks, it was suggested an exhumation of serpentinite-subduction channel type
publishDate 2017
dc.date.issued.none.fl_str_mv 2017
dc.date.accessioned.none.fl_str_mv 2020-06-10T16:38:43Z
dc.date.available.none.fl_str_mv 2020-06-10T16:38:43Z
dc.type.spa.fl_str_mv Trabajo de grado - Pregrado
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identifier_str_mv u807400.pdf
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dc.format.extent.es_CO.fl_str_mv 59 hojas
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dc.publisher.es_CO.fl_str_mv Universidad de los Andes
dc.publisher.program.es_CO.fl_str_mv Geociencias
dc.publisher.faculty.es_CO.fl_str_mv Facultad de Ciencias
dc.publisher.department.es_CO.fl_str_mv Departamento de Geociencias
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spelling Al consultar y hacer uso de este recurso, está aceptando las condiciones de uso establecidas por los autores.http://creativecommons.org/licenses/by-nc-sa/4.0/info:eu-repo/semantics/openAccesshttp://purl.org/coar/access_right/c_abf2Blanco Quintero, Idael3ca53113-e058-4b6d-9273-ea01b187f9c9400Rodríguez Vargas, Andrés Ignacio9ab03bcc-ab30-4928-a6c4-bb63a5816bc1500Carmona Mongua, Valentinaa7bcada9-d447-4103-bdf8-2bc0e322b421500Rojas-Agramonte, Yamirka2020-06-10T16:38:43Z2020-06-10T16:38:43Z2017http://hdl.handle.net/1992/39911u807400.pdfinstname:Universidad de los Andesreponame:Repositorio Institucional Sénecarepourl:https://repositorio.uniandes.edu.co/Jambaló greenschist and blueschist are found in a metamorphic unit that belongs to the Arquía complex. Metamorphism of these rocks is associated with the subduction of the Proto-Caribbean under the South American plate. Age of metamorphism has been estimated by Bustamante (2008) with Ar-Ar method as Maastrichtian-Danian (67-61 Ma). Paragenesis of blueschist facies rocks is Glaucophane (Fe-glaucophane) + quartz + phengite + albite + epidote + chlorite (pycnochlorite) garnet, and paragenesis of greenschist facies rock is albite + quartz + chlorite (pycnochlorite) + calcite + epidote. Greenschist rocks have been altered by an infiltrating fluid with CO2, transforming the paragenesis from a paragenesis with actinolite to a paragenesis with calcite and with absence of actinolite. Protholits of theses rocks were obtained through mineral chemistry, whole rock composition and paragenesis analysis, defining a metapelitic protholit for blueschist rocks and a metabasic protholit for greenschist rocks. According to P-T conditions, both rock types reached approximately the metamorphic peak at 9.2 kbar and 481°C, which corresponds to the transitional assemblage between greenschist to blueschist facies. Petrography provides evidence of retrogression with a slight overprint of a lower facies (greenschist). However, rocks preserve their peak assemblage, indicating a hairpin retrograde path. According to this path and to lithologic relations between the studied rocks, it was suggested an exhumation of serpentinite-subduction channel typeLos esquistos azules y los esquistos verdes de Jambaló en una unidad metamórfica perteneciente al completo Arquía. El metamorfismo de estas rocas está asociado a la subducción del Proto-Caribe bajo la placa Suramericana. La edad de este metamorfismo, fue estimada por Bustamante (2008) mediante el método Ar-Ar como Maastrichtiense - Daniense (67-61 Ma). La paragénesis de las rocas en facies esquisto azul se compone de: Glaucofana (Fe-glaucofana) + cuarzo + fengita + albita + epidota + clorita (picnoclorita) + calcita + granate. Por otro lado, la paragénesis de las rocas en facies esquisto verde es albita + curazo + clorita (picnoclorita) + calcita + epidota. Además del proceso metamórfico, los esquistos verdes fueron alterados por una infiltración de fluidos con contenido de CO2, transformando la paragénesis original, con actinolita, a una paragénesis con calcita y sin presencia de actinolita. Los protolitos de estas rocas fueron obtenidos mediante el análisis de la química mineral, composición de roca total y paragénesis. De esta manera, se definió un protolito metapelítico para las rocas en facies de esquisto azul y uno metabásico para las rocas en facies de esquisto verde. Adicionalmente, de acuerdo a los resultados de las condiciones P-T, ambos tipos de roca alcanzaron, aproximadamente, el pico metamórfico en 9.2 kbar a 481°C, lo que corresponde a la zona transicional entre las condiciones de esquisto verde y esquisto azul. La petrografía provee evidencia de retrogresión con una superposición no total de una menor facies (esquisto verde). A pesar de este proceso, las rocas preservan la asociación de pico metamórfico, lo que indica una trayectoria retrograda de tipo -hairpin-. Según esta trayectoria y las relaciones litológicas de campo entre las rocas estudiadas, se sugiere una exhumación de tipo canal de subducción serpentinitizado.GeocientíficoPregrado59 hojasapplication/pdfengUniversidad de los AndesGeocienciasFacultad de CienciasDepartamento de Geocienciasinstname:Universidad de los Andesreponame:Repositorio Institucional SénecaPetrologic characterization and tectonic implications of blueschist and greenschist facies rocks of Jambaló, CaucaTrabajo de grado - Pregradoinfo:eu-repo/semantics/bachelorThesishttp://purl.org/coar/resource_type/c_7a1fhttp://purl.org/coar/version/c_970fb48d4fbd8a85Texthttp://purl.org/redcol/resource_type/TPGeología estructuralPetrologíaEsquistosGeocienciasPublicationTEXTu807400.pdf.txtu807400.pdf.txtExtracted texttext/plain69870https://repositorio.uniandes.edu.co/bitstreams/ad0bbea1-fdf2-4f96-8ffa-d1691fcb1e1d/download5e6c92b95f219d62084f026d3b5e7b16MD54ORIGINALu807400.pdfapplication/pdf3304506https://repositorio.uniandes.edu.co/bitstreams/c4a3f2c9-cd9a-4743-99ad-abe74e5a8d71/download3c4246ab175c70d2f6bae95a8667f08fMD51THUMBNAILu807400.pdf.jpgu807400.pdf.jpgIM Thumbnailimage/jpeg7913https://repositorio.uniandes.edu.co/bitstreams/002ae4f8-4580-4a82-b30a-fac528704665/download1be0b4cb5d1713d89e373a3dd408330aMD551992/39911oai:repositorio.uniandes.edu.co:1992/399112023-10-10 16:10:32.88http://creativecommons.org/licenses/by-nc-sa/4.0/open.accesshttps://repositorio.uniandes.edu.coRepositorio institucional Sénecaadminrepositorio@uniandes.edu.co