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dc.contributor.author
Do Campo, Margarita Diana
dc.contributor.author
Collo, Gilda
dc.contributor.author
Nieto, Fernando
dc.date.available
2017-06-16T21:37:40Z
dc.date.issued
2013-06
dc.identifier.citation
Do Campo, Margarita Diana; Collo, Gilda; Nieto, Fernando; Geothermobarometry of very low-grade metamorphic pelites of the Vendian–Early Cambrian Puncoviscana Formation (NW Argentina); E Schweizerbartsche Verlags; European Journal Of Mineralogy (print); 25; 3; 6-2013; 429-451
dc.identifier.issn
0935-1221
dc.identifier.uri
http://hdl.handle.net/11336/18378
dc.description.abstract
The Vendian–Early Cambrian Puncoviscana Formation is a pelite-greywacke turbidite sequence affected by polyphase deformation cropping out extensively in the Cordillera Oriental of northwestern Argentina. Previous X-ray diffraction and analytical high-resolution TEM studies on southern locations found anchizonal grade and proposed medium–high pressure metamorphism followed by higher thermal conditions. We have determined the chemical composition of mica and chlorite with EDX on small uncontaminated areas selected using SEM in backscattered electron mode. The application of mica-chlorite geothermobarometry to mineral grains defining two different foliations has produced consistent pressure/temperature results based on the intersection of six reactions: 9 kbar/250 °C peak conditions were followed by an isothermal decompression to 3 kbar and a successive increase of temperature to nearly 350 °C at 1.5 kbar. The shales from the overlying Mesón and Santa Victoria Cambro–Ordovician groups do not contain chlorite, thus chlorite-mica geothermobarometry could not be applied. According to the range of KICIS obtained (0.41–0.68Δ°2) and their mineralogical assemblage (illite ± kaolinite ± corrensite + Qtz + Pl ± Kfs), these rocks have not surpassed diagenetic conditions, which implies a minimum temperature difference with the Puncoviscana Formation of 100 °C, consistent with the sharp angular unconformity between the two units.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
E Schweizerbartsche Verlags
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by/2.5/ar/
dc.subject
Chlorite
dc.subject
Phengite
dc.subject
P-T Time Paths
dc.subject
Edx
dc.subject.classification
Mineralogía
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Ciencias de la Tierra y relacionadas con el Medio Ambiente
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CIENCIAS NATURALES Y EXACTAS
dc.title
Geothermobarometry of very low-grade metamorphic pelites of the Vendian–Early Cambrian Puncoviscana Formation (NW Argentina)
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-06-16T15:52:43Z
dc.journal.volume
25
dc.journal.number
3
dc.journal.pagination
429-451
dc.journal.pais
Alemania
dc.journal.ciudad
Stuttgart
dc.description.fil
Fil: Do Campo, Margarita Diana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Geocronología y Geología Isotopica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Geocronología y Geología Isotopica; Argentina
dc.description.fil
Fil: Collo, Gilda. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones En Ciencias de la Tierra. Universidad Nacional de Córdoba. Facultad de Cs.exactas Físicas y Naturales. Centro de Investigaciones En Ciencias de la Tierra; Argentina
dc.description.fil
Fil: Nieto, Fernando. Consejo Superior de Investigaciones Cientificas; España. Universidad de Granada; España
dc.journal.title
European Journal Of Mineralogy (print)
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1127/0935-1221/2013/0025-2284
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.ingentaconnect.com/content/schweiz/ejm/2013/00000025/00000003/art00014
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