P-T-d path of a garnet-bearing metagranite from the Paleoproterozoic basement of the Tandilia terrane, Rio de la Plata craton, Argentina

Autores
Angeletti, Melisa; Martinez, Juan Cruz; Frisicale, Maria Cristina; Massonne, H. J.
Año de publicación
2019
Idioma
inglés
Tipo de recurso
documento de conferencia
Estado
versión publicada
Descripción
The Tandilia Terrane (TT), in central-eastern Argentina and southeastern Uruguay (Pamoukaghlian et al., 2017), is a Paleoproterozoicigneous-metamorphic complex that represents the southernmost expositions of theRio de la Plata craton (RPC). The study area includes the small outcrops of theLa Virgen hill, western TT, mainly composed of a garnet-bearing granite. As wewant to constraint the P-T-d evolution path of this granite, the appraisal ofmicrostructures was integrated to a P-T pseudosection modeled with the PERPLE_Xsoftware for a selected bulk-rock composition in the 11-component systemSi-Ti-Al-Fe-Mn-Mg-Ca-Na-K-O-H, and to various contoured chemical parameters ofinterest. The analyzed rock is a slightly deformed, peraluminous (ASI= 1.07),grey granite composed of (~ vol.%): K-feldspar (37), quartz (30), plagioclase(18), biotite (7), garnet (5), muscovite (2), zircon, apatite, monazite andopaque minerals as accessory phases (1). The porphyroclastic texture, withdevelopment of core-and-mantle, is characterized by a 15 vol.% of fine-grained granoblastic matrix. The derived P-T path is as follows: the garnet corecomposition of pyr4(gro+andr)12spes10alm74,equilibrated with andesine (XAn = 0.37), yielded P-T conditions of 6 kbar and 650°C (Fig. 1, point A) near the melt out curve (~7 vol.% of melt).The stable mineral assemblage at these conditions is Ms+Pl+Kfs+Ilm+Üsp+Grt+Bt+Qtz, as in the natural rock. Garnet recorded a rimward decreased in pyrope from 4 to 3 mol% by slow cation diffusion until its out stability limit is reached at 5.5 kbar and 620°C (Fig. 1, point B). The subsequent path is fairly constrained between isopleths of 3.09-3.17 Si (pfu)in muscovite and XAn = 0.36 in plagioclase. The deciphered evolution path in the studied rock demonstrates the cooling down of a near solidus granitic material during exhumation from the middle crust (22 km), under an apparent geotherm of ~ 30 °Ckm-1, until upper crustal conditions of ~7 km. The ductile microstructures of deformation in the protomylonitic granite are consistent with others microstructures observed in feldspars (deformation twins, myrmekites and flame perthites) which for the 1.5 km distant granitic rock of the Siempre Amigos area were restricted between 650 °C and 430 °C (Angeletti et al., 2016). The exhumation path suggested for the studied peraluminous granite is similar to the garnet-bearing leucogranite of San Veran hill, sited 100 km to the SE of the study area, which was related to a postcollisional stage of the Trans-Amazonian orogeny cycle (Martínez et al. 2017).
Fil: Angeletti, Melisa. Universidad Nacional del Sur. Departamento de Geología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Martinez, Juan Cruz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Fil: Frisicale, Maria Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Fil: Massonne, H. J.. Universität Stuttgart. Fakultät Chemie; Alemania. China University of Geosciences. School of Earth Sciences; China
25th Latin-American Colloquium of Geosciences
Hamburgo
Alemania
Universität Hamburg
Materia
GEOTERMOBAROMETRÍA
PETROLOGÍA
CRATON RÍO DE LA PLATA
EVOLUCIÓN GEOLÓGICA
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/174495

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network_name_str CONICET Digital (CONICET)
spelling P-T-d path of a garnet-bearing metagranite from the Paleoproterozoic basement of the Tandilia terrane, Rio de la Plata craton, ArgentinaAngeletti, MelisaMartinez, Juan CruzFrisicale, Maria CristinaMassonne, H. J.GEOTERMOBAROMETRÍAPETROLOGÍACRATON RÍO DE LA PLATAEVOLUCIÓN GEOLÓGICAhttps://purl.org/becyt/ford/1.5https://purl.org/becyt/ford/1The Tandilia Terrane (TT), in central-eastern Argentina and southeastern Uruguay (Pamoukaghlian et al., 2017), is a Paleoproterozoicigneous-metamorphic complex that represents the southernmost expositions of theRio de la Plata craton (RPC). The study area includes the small outcrops of theLa Virgen hill, western TT, mainly composed of a garnet-bearing granite. As wewant to constraint the P-T-d evolution path of this granite, the appraisal ofmicrostructures was integrated to a P-T pseudosection modeled with the PERPLE_Xsoftware for a selected bulk-rock composition in the 11-component systemSi-Ti-Al-Fe-Mn-Mg-Ca-Na-K-O-H, and to various contoured chemical parameters ofinterest. The analyzed rock is a slightly deformed, peraluminous (ASI= 1.07),grey granite composed of (~ vol.%): K-feldspar (37), quartz (30), plagioclase(18), biotite (7), garnet (5), muscovite (2), zircon, apatite, monazite andopaque minerals as accessory phases (1). The porphyroclastic texture, withdevelopment of core-and-mantle, is characterized by a 15 vol.% of fine-grained granoblastic matrix. The derived P-T path is as follows: the garnet corecomposition of pyr4(gro+andr)12spes10alm74,equilibrated with andesine (XAn = 0.37), yielded P-T conditions of 6 kbar and 650°C (Fig. 1, point A) near the melt out curve (~7 vol.% of melt).The stable mineral assemblage at these conditions is Ms+Pl+Kfs+Ilm+Üsp+Grt+Bt+Qtz, as in the natural rock. Garnet recorded a rimward decreased in pyrope from 4 to 3 mol% by slow cation diffusion until its out stability limit is reached at 5.5 kbar and 620°C (Fig. 1, point B). The subsequent path is fairly constrained between isopleths of 3.09-3.17 Si (pfu)in muscovite and XAn = 0.36 in plagioclase. The deciphered evolution path in the studied rock demonstrates the cooling down of a near solidus granitic material during exhumation from the middle crust (22 km), under an apparent geotherm of ~ 30 °Ckm-1, until upper crustal conditions of ~7 km. The ductile microstructures of deformation in the protomylonitic granite are consistent with others microstructures observed in feldspars (deformation twins, myrmekites and flame perthites) which for the 1.5 km distant granitic rock of the Siempre Amigos area were restricted between 650 °C and 430 °C (Angeletti et al., 2016). The exhumation path suggested for the studied peraluminous granite is similar to the garnet-bearing leucogranite of San Veran hill, sited 100 km to the SE of the study area, which was related to a postcollisional stage of the Trans-Amazonian orogeny cycle (Martínez et al. 2017).Fil: Angeletti, Melisa. Universidad Nacional del Sur. Departamento de Geología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Martinez, Juan Cruz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; ArgentinaFil: Frisicale, Maria Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; ArgentinaFil: Massonne, H. J.. Universität Stuttgart. Fakultät Chemie; Alemania. China University of Geosciences. School of Earth Sciences; China25th Latin-American Colloquium of GeosciencesHamburgoAlemaniaUniversität HamburgGeoUnion Alfred-Wegener-StiftungRiller, UlrichGöllner, Paul2019info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectOtroJournalhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/174495P-T-d path of a garnet-bearing metagranite from the Paleoproterozoic basement of the Tandilia terrane, Rio de la Plata craton, Argentina; 25th Latin-American Colloquium of Geosciences; Hamburgo; Alemania; 2019; 28-290946-8978CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://www.geo-union.de/terra-nostra.htmlinfo:eu-repo/semantics/altIdentifier/url/https://e-docs.geo-leo.de/handle/11858/7935info:eu-repo/semantics/altIdentifier/doi/10.23689/fidgeo-3609Internacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:43:42Zoai:ri.conicet.gov.ar:11336/174495instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 09:43:42.411CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv P-T-d path of a garnet-bearing metagranite from the Paleoproterozoic basement of the Tandilia terrane, Rio de la Plata craton, Argentina
title P-T-d path of a garnet-bearing metagranite from the Paleoproterozoic basement of the Tandilia terrane, Rio de la Plata craton, Argentina
spellingShingle P-T-d path of a garnet-bearing metagranite from the Paleoproterozoic basement of the Tandilia terrane, Rio de la Plata craton, Argentina
Angeletti, Melisa
GEOTERMOBAROMETRÍA
PETROLOGÍA
CRATON RÍO DE LA PLATA
EVOLUCIÓN GEOLÓGICA
title_short P-T-d path of a garnet-bearing metagranite from the Paleoproterozoic basement of the Tandilia terrane, Rio de la Plata craton, Argentina
title_full P-T-d path of a garnet-bearing metagranite from the Paleoproterozoic basement of the Tandilia terrane, Rio de la Plata craton, Argentina
title_fullStr P-T-d path of a garnet-bearing metagranite from the Paleoproterozoic basement of the Tandilia terrane, Rio de la Plata craton, Argentina
title_full_unstemmed P-T-d path of a garnet-bearing metagranite from the Paleoproterozoic basement of the Tandilia terrane, Rio de la Plata craton, Argentina
title_sort P-T-d path of a garnet-bearing metagranite from the Paleoproterozoic basement of the Tandilia terrane, Rio de la Plata craton, Argentina
dc.creator.none.fl_str_mv Angeletti, Melisa
Martinez, Juan Cruz
Frisicale, Maria Cristina
Massonne, H. J.
author Angeletti, Melisa
author_facet Angeletti, Melisa
Martinez, Juan Cruz
Frisicale, Maria Cristina
Massonne, H. J.
author_role author
author2 Martinez, Juan Cruz
Frisicale, Maria Cristina
Massonne, H. J.
author2_role author
author
author
dc.contributor.none.fl_str_mv Riller, Ulrich
Göllner, Paul
dc.subject.none.fl_str_mv GEOTERMOBAROMETRÍA
PETROLOGÍA
CRATON RÍO DE LA PLATA
EVOLUCIÓN GEOLÓGICA
topic GEOTERMOBAROMETRÍA
PETROLOGÍA
CRATON RÍO DE LA PLATA
EVOLUCIÓN GEOLÓGICA
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.5
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The Tandilia Terrane (TT), in central-eastern Argentina and southeastern Uruguay (Pamoukaghlian et al., 2017), is a Paleoproterozoicigneous-metamorphic complex that represents the southernmost expositions of theRio de la Plata craton (RPC). The study area includes the small outcrops of theLa Virgen hill, western TT, mainly composed of a garnet-bearing granite. As wewant to constraint the P-T-d evolution path of this granite, the appraisal ofmicrostructures was integrated to a P-T pseudosection modeled with the PERPLE_Xsoftware for a selected bulk-rock composition in the 11-component systemSi-Ti-Al-Fe-Mn-Mg-Ca-Na-K-O-H, and to various contoured chemical parameters ofinterest. The analyzed rock is a slightly deformed, peraluminous (ASI= 1.07),grey granite composed of (~ vol.%): K-feldspar (37), quartz (30), plagioclase(18), biotite (7), garnet (5), muscovite (2), zircon, apatite, monazite andopaque minerals as accessory phases (1). The porphyroclastic texture, withdevelopment of core-and-mantle, is characterized by a 15 vol.% of fine-grained granoblastic matrix. The derived P-T path is as follows: the garnet corecomposition of pyr4(gro+andr)12spes10alm74,equilibrated with andesine (XAn = 0.37), yielded P-T conditions of 6 kbar and 650°C (Fig. 1, point A) near the melt out curve (~7 vol.% of melt).The stable mineral assemblage at these conditions is Ms+Pl+Kfs+Ilm+Üsp+Grt+Bt+Qtz, as in the natural rock. Garnet recorded a rimward decreased in pyrope from 4 to 3 mol% by slow cation diffusion until its out stability limit is reached at 5.5 kbar and 620°C (Fig. 1, point B). The subsequent path is fairly constrained between isopleths of 3.09-3.17 Si (pfu)in muscovite and XAn = 0.36 in plagioclase. The deciphered evolution path in the studied rock demonstrates the cooling down of a near solidus granitic material during exhumation from the middle crust (22 km), under an apparent geotherm of ~ 30 °Ckm-1, until upper crustal conditions of ~7 km. The ductile microstructures of deformation in the protomylonitic granite are consistent with others microstructures observed in feldspars (deformation twins, myrmekites and flame perthites) which for the 1.5 km distant granitic rock of the Siempre Amigos area were restricted between 650 °C and 430 °C (Angeletti et al., 2016). The exhumation path suggested for the studied peraluminous granite is similar to the garnet-bearing leucogranite of San Veran hill, sited 100 km to the SE of the study area, which was related to a postcollisional stage of the Trans-Amazonian orogeny cycle (Martínez et al. 2017).
Fil: Angeletti, Melisa. Universidad Nacional del Sur. Departamento de Geología; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
Fil: Martinez, Juan Cruz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Fil: Frisicale, Maria Cristina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina
Fil: Massonne, H. J.. Universität Stuttgart. Fakultät Chemie; Alemania. China University of Geosciences. School of Earth Sciences; China
25th Latin-American Colloquium of Geosciences
Hamburgo
Alemania
Universität Hamburg
description The Tandilia Terrane (TT), in central-eastern Argentina and southeastern Uruguay (Pamoukaghlian et al., 2017), is a Paleoproterozoicigneous-metamorphic complex that represents the southernmost expositions of theRio de la Plata craton (RPC). The study area includes the small outcrops of theLa Virgen hill, western TT, mainly composed of a garnet-bearing granite. As wewant to constraint the P-T-d evolution path of this granite, the appraisal ofmicrostructures was integrated to a P-T pseudosection modeled with the PERPLE_Xsoftware for a selected bulk-rock composition in the 11-component systemSi-Ti-Al-Fe-Mn-Mg-Ca-Na-K-O-H, and to various contoured chemical parameters ofinterest. The analyzed rock is a slightly deformed, peraluminous (ASI= 1.07),grey granite composed of (~ vol.%): K-feldspar (37), quartz (30), plagioclase(18), biotite (7), garnet (5), muscovite (2), zircon, apatite, monazite andopaque minerals as accessory phases (1). The porphyroclastic texture, withdevelopment of core-and-mantle, is characterized by a 15 vol.% of fine-grained granoblastic matrix. The derived P-T path is as follows: the garnet corecomposition of pyr4(gro+andr)12spes10alm74,equilibrated with andesine (XAn = 0.37), yielded P-T conditions of 6 kbar and 650°C (Fig. 1, point A) near the melt out curve (~7 vol.% of melt).The stable mineral assemblage at these conditions is Ms+Pl+Kfs+Ilm+Üsp+Grt+Bt+Qtz, as in the natural rock. Garnet recorded a rimward decreased in pyrope from 4 to 3 mol% by slow cation diffusion until its out stability limit is reached at 5.5 kbar and 620°C (Fig. 1, point B). The subsequent path is fairly constrained between isopleths of 3.09-3.17 Si (pfu)in muscovite and XAn = 0.36 in plagioclase. The deciphered evolution path in the studied rock demonstrates the cooling down of a near solidus granitic material during exhumation from the middle crust (22 km), under an apparent geotherm of ~ 30 °Ckm-1, until upper crustal conditions of ~7 km. The ductile microstructures of deformation in the protomylonitic granite are consistent with others microstructures observed in feldspars (deformation twins, myrmekites and flame perthites) which for the 1.5 km distant granitic rock of the Siempre Amigos area were restricted between 650 °C and 430 °C (Angeletti et al., 2016). The exhumation path suggested for the studied peraluminous granite is similar to the garnet-bearing leucogranite of San Veran hill, sited 100 km to the SE of the study area, which was related to a postcollisional stage of the Trans-Amazonian orogeny cycle (Martínez et al. 2017).
publishDate 2019
dc.date.none.fl_str_mv 2019
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dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/174495
P-T-d path of a garnet-bearing metagranite from the Paleoproterozoic basement of the Tandilia terrane, Rio de la Plata craton, Argentina; 25th Latin-American Colloquium of Geosciences; Hamburgo; Alemania; 2019; 28-29
0946-8978
CONICET Digital
CONICET
url http://hdl.handle.net/11336/174495
identifier_str_mv P-T-d path of a garnet-bearing metagranite from the Paleoproterozoic basement of the Tandilia terrane, Rio de la Plata craton, Argentina; 25th Latin-American Colloquium of Geosciences; Hamburgo; Alemania; 2019; 28-29
0946-8978
CONICET Digital
CONICET
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language eng
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info:eu-repo/semantics/altIdentifier/doi/10.23689/fidgeo-3609
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