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dc.contributor.author
Calderón, Mauricio
dc.contributor.author
Zuñiga, Catalina
dc.contributor.author
Hervé, Francisco
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dc.contributor.author
Theye, Thomas
dc.contributor.author
Galaz, Gonzalo
dc.contributor.author
Rojo, Diego
dc.contributor.author
Suárez, Rodrigo Javier
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dc.date.available
2022-11-09T17:51:06Z
dc.date.issued
2021
dc.identifier.citation
Barrovian-type metamorphism in the western domain of the Cordillera Darwin Metamorphic Complex, Fuegian Andes; EGU General Assembly 2021; Alemania; 2021; 1-2
dc.identifier.uri
http://hdl.handle.net/11336/177103
dc.description.abstract
The Cordillera de Darwin Metamorphic Complex (CDMC) comprise metamorphosed supracrustal rocks and metaplutonic suites which records a unique tectonic evolution among the metamorphic complexes of the southernmost Andes. The pressure (P) and temperature (T) conditions determined in garnet-bearing schists in the Central Domain of the CDMC indicate a clockwise P-T path of metamorphism reaching burial depth as high as 12 kbar at ca. 620°C. This metamorphic event has been related to the closure of a marginal back-arc basin (Rocas Verdes Basin) and collision of an ensialic magmatic arc with the continent in the late Cretaceous. We focus on garnet-biotite schists intercalated within a huge block consisting of repeated sequences of metabasalts and amphibolites (Rocas Verdes Ophiolites), located in the Western Domain of the CDMC, at Seno Martínez. The chemical zonation of small garnet porphyroblasts (diameter of ca. 300 um) record two stages of metamorphism. Garnet is almost almandine in composition with lesser amounts of Ca, Mn and Mg. The concentric zonation is characterized by relatively lower contents of Fe-Mg and higher contents of Ca-Mn in the core. Garnet bear tiny inclusions of clinozoisite, which is also present as isolated grains in the foliated matrix. Laths of biotite define the main foliation and have a nearly constant composition characterized by XFe of ca. 0.6. Two generations of phengitic white mica are identified on basis of Si content (a.pf.u.) varying between 3.20-3.30 (early generation) and of ca. 3.15 (late generation). To reconstruct the P-T conditions of metamorphism through thermodynamic modeling using the Perple_X software package, the bulk rock and mineral composition were considered. Using compositional isopleths of XFe, XMg, XCa and XMn in zoned garnet, Si content in white mica and XFe in biotite allow the constrain two stages of metamorphism (M1 and M2). The P-T conditions of M1, represented by the composition of the garnet core, are restricted to ca. 8 kbar and 400°C. M2 is restricted to ca. 7.5 kbar at 480°C, determined with the composition of the garnet rim, XFe in biotite and Si content in late phengitic white mica. Our preliminary results indicate that ophiolitic rocks and interleaved garnet-bearing schists were tectonically buried and metamorphosed in a relatively hot subduction interface characterized by a geothermal gradient of ca. 16°C/km, prior to the collision of the ensialic magmatic arc.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Copernicus Publications
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by/2.5/ar/
dc.subject
Cordillera de Darwin
dc.subject
Metamorphism
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Rocas Verdes back-arc basin
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Barrovian-type metamorphism
dc.subject.classification
Mineralogía
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dc.subject.classification
Ciencias de la Tierra y relacionadas con el Medio Ambiente
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Barrovian-type metamorphism in the western domain of the Cordillera Darwin Metamorphic Complex, Fuegian Andes
dc.type
info:eu-repo/semantics/publishedVersion
dc.type
info:eu-repo/semantics/conferenceObject
dc.type
info:ar-repo/semantics/documento de conferencia
dc.date.updated
2022-09-27T10:45:39Z
dc.journal.pagination
1-2
dc.journal.pais
Alemania
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dc.journal.ciudad
Göttingen
dc.description.fil
Fil: Calderón, Mauricio. Universidad Andrés Bello; Chile
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Fil: Zuñiga, Catalina. Universidad Andrés Bello; Chile
dc.description.fil
Fil: Hervé, Francisco. Universidad Andrés Bello; Chile. Universidad de Santiago de Chile. Dto de Geología; Chile
dc.description.fil
Fil: Theye, Thomas. Staatliches Museum fur Naturkunde Stuttgart; Alemania
dc.description.fil
Fil: Galaz, Gonzalo. Universidad de Atacama.; Chile
dc.description.fil
Fil: Rojo, Diego. Universidad Arturo Prat; Chile
dc.description.fil
Fil: Suárez, Rodrigo Javier. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Estudios Andinos "Don Pablo Groeber". Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Estudios Andinos "Don Pablo Groeber"; Argentina
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://meetingorganizer.copernicus.org/EGU21/EGU21-5612.html
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.5194/egusphere-egu21-5612
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dc.coverage
Internacional
dc.type.subtype
Congreso
dc.description.nombreEvento
EGU General Assembly 2021
dc.date.evento
2021-04-19
dc.description.paisEvento
Alemania
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dc.type.publicacion
Journal
dc.description.institucionOrganizadora
European Geosciences Union
dc.source.revista
Geophysical Research Abstracts
dc.date.eventoHasta
2021-04-30
dc.type
Congreso
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