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Abstract:

The Inti Huasi granite at the southern end of the Sierra de Comechingones is one of three examples of post-Famatinian, alkali-rich, weakly-peraluminous monzogranitic magmatism of the Sierra de Córdoba. According to geophysical data the Inti Huasi granite is largely covered (> 90%) by Quaternary sediments. The sedimentary cover, however, makes it impossible to identify and map satisfactorily all the possible sub-intrusions units which represent individual magmatic pulses that fed the Inti Huasi granite. Nevertheless, rock diversity seems to reflect the effect of high-level differentiation processes. The most common rock type is a biotite ± muscovite bearing monzogranite. Monzogranites are characteristically felsic (SiO2 > 73 %, and FeO* + MgO + TiO2 < 2,4), weakly peraluminous (Al2O3/(CaO + Na2O + K2O = 0.98 - 1,11), and contain ilmenite, sphene, apatite and zircon as accessory minerals. Although the compositional range of the monzogranites is small, it defines a differentiation trend that is essentially controlled by biotite and plagioclase fractionation. Leucogranitic dykes, which intruded monzogranites at a late- to post-magmatic stage and were the feeders of layered aplites, have compositional features typical of liquids formed after significant fractionation. By contrast, muscovite-rich monzogranites occupying a high-stratigraphical position resulted from syn- to late-crystallisation interaction between normal monzogranites and fluids. Genetic links among granitic rocks and biotite-plagioclase rich enclaves are shown by the composition of minerals and the trend of major elements, indicating that enclaves are small cumulates of early crystallised phases trapped by the granitic magma as was proved for the large enclaves of the Achala batholith. Petrological evidence suggests that the granitic magma of Inti Huasi was generated by partial melting of intermediate non-peraluminous rocks residing in intra-continental crust.

Registro:

Documento: Artículo
Título:Geology, petrology and mineralogy of the Inti Huasi Granite, southern Sierra de Comechingones, Córdoba
Autor:Otamendi, J.E.; Fagiano, M.R.; Nullo, F.E.; Castellarini, P.A.
Filiación:CONICET, Buenos Aires, Argentina
Departamento de Geología, Universidad Nac. de Rio Cuarto, Río Cuarto 5800, Argentina
Depto. de Ciencias Geológicas, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires 1428, Argentina
Palabras clave:Igneous rocks; Magmatic differentiation; Monzogranites; Sierras Pampeanas; granite; igneous rock; magmatic differentiation; mineralogy; partial melting; petrology; Argentina
Año:2002
Volumen:57
Número:4
Página de inicio:389
Página de fin:403
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_v57_n4_p389_Otamendi

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Citas:

---------- APA ----------
Otamendi, J.E., Fagiano, M.R., Nullo, F.E. & Castellarini, P.A. (2002) . Geology, petrology and mineralogy of the Inti Huasi Granite, southern Sierra de Comechingones, Córdoba . Revista de la Asociacion Geologica Argentina, 57(4), 389-403.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v57_n4_p389_Otamendi [ ]
---------- CHICAGO ----------
Otamendi, J.E., Fagiano, M.R., Nullo, F.E., Castellarini, P.A. "Geology, petrology and mineralogy of the Inti Huasi Granite, southern Sierra de Comechingones, Córdoba " . Revista de la Asociacion Geologica Argentina 57, no. 4 (2002) : 389-403.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v57_n4_p389_Otamendi [ ]
---------- MLA ----------
Otamendi, J.E., Fagiano, M.R., Nullo, F.E., Castellarini, P.A. "Geology, petrology and mineralogy of the Inti Huasi Granite, southern Sierra de Comechingones, Córdoba " . Revista de la Asociacion Geologica Argentina, vol. 57, no. 4, 2002, pp. 389-403.
Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v57_n4_p389_Otamendi [ ]
---------- VANCOUVER ----------
Otamendi, J.E., Fagiano, M.R., Nullo, F.E., Castellarini, P.A. Geology, petrology and mineralogy of the Inti Huasi Granite, southern Sierra de Comechingones, Córdoba . Rev. Asoc. Geol. Argent. 2002;57(4):389-403.
Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00044822_v57_n4_p389_Otamendi [ ]