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Abstract:

La Esperanza Plutonic Complex crops out in the northern part of the North Patagonian Massif in the Upper Paleozoic magmatic belt of northern Patagonia. This magmatic complex is mainly composed of 273 Ma biotite and amphibole bearing (Prieto Granodiorite) or biotite bearing (Donosa Granite) granitoids. In this study, biotite and amphibole mineral compositions are used to describe the nature of the granitic magma and to estimate the pressure and temperature at which these plutons were emplaced. Based on biotite chemistry, La Esperanza Plutonic Complex represents a calc-alkaline magma with a trend of increasing peraluminosity, which could be related to a transitional orogenic to anorogenic setting. Emplacement pressures for Prieto Granodiorite vary between 0,6 and 2,0 kbar, with higher values in an inequigranular facies which crops out to the east of La Esperanza locality. Hornblende-Plagioclase thermometer yields emplacement temperatures ranging from 630 to 790°C at high oxygen fugacity conditions. These results, combined with good qualitycooling ages, propose a shallow emplacement in an elevated thermal regime that might have lasted from Middle Permian to Permotriassic times.

Registro:

Documento: Artículo
Título:Chemical composition of biotite and hornblende and cooling ages as indicators of the emplacement conditions of the la esperanza plutonic complex (Upper Permian), North Patagonian Massif
Autor:Martínez Dopico, C.I.; López De Luchi, M.G.; Wemmer, K.; Rapalini, A.E.
Filiación:Instituto de Geocronología y Geología Isotópica (INGEIS), CONICET-Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina
Instituto de Ciencias Básicas, Aplicadas y Ambientales de Buenos Aires (IGEBA), Departamento de Ciencias Geológicas, Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina
Geoscience Centre de la Universidad de Göttingen (GZG), Göttingen, Germany
Palabras clave:Biotite; Hornblende; La esperanza plutonic complex; Permian; Thermobarometry; barometry; biotite; chemical composition; cooling; emplacement; hornblende; magma; Paleozoic; Permian; pluton; pressure effect; temperature effect; Patagonia; Esperanza
Año:2013
Volumen:70
Número:1
Página de inicio:3
Página de fin:15
Título revista:Revista de la Asociacion Geologica Argentina
Título revista abreviado:Rev. Asoc. Geol. Argent.
ISSN:00044822
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v70_n1_p3_MartinezDopico

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Citas:

---------- APA ----------
Martínez Dopico, C.I., López De Luchi, M.G., Wemmer, K. & Rapalini, A.E. (2013) . Chemical composition of biotite and hornblende and cooling ages as indicators of the emplacement conditions of the la esperanza plutonic complex (Upper Permian), North Patagonian Massif . Revista de la Asociacion Geologica Argentina, 70(1), 3-15.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v70_n1_p3_MartinezDopico [ ]
---------- CHICAGO ----------
Martínez Dopico, C.I., López De Luchi, M.G., Wemmer, K., Rapalini, A.E. "Chemical composition of biotite and hornblende and cooling ages as indicators of the emplacement conditions of the la esperanza plutonic complex (Upper Permian), North Patagonian Massif " . Revista de la Asociacion Geologica Argentina 70, no. 1 (2013) : 3-15.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v70_n1_p3_MartinezDopico [ ]
---------- MLA ----------
Martínez Dopico, C.I., López De Luchi, M.G., Wemmer, K., Rapalini, A.E. "Chemical composition of biotite and hornblende and cooling ages as indicators of the emplacement conditions of the la esperanza plutonic complex (Upper Permian), North Patagonian Massif " . Revista de la Asociacion Geologica Argentina, vol. 70, no. 1, 2013, pp. 3-15.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v70_n1_p3_MartinezDopico [ ]
---------- VANCOUVER ----------
Martínez Dopico, C.I., López De Luchi, M.G., Wemmer, K., Rapalini, A.E. Chemical composition of biotite and hornblende and cooling ages as indicators of the emplacement conditions of the la esperanza plutonic complex (Upper Permian), North Patagonian Massif . Rev. Asoc. Geol. Argent. 2013;70(1):3-15.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v70_n1_p3_MartinezDopico [ ]