Mineralogical analyses of hydrothermal magnetite from the San Pedro Cu-(Mo) porphyry deposit

The formation of Fe-Ti oxides is controlled by the mineralogy of the host rock and the physico-chemical conditions of the hydrothermal fluids. Therefore a correlation between the mineralogy of a hydrothermal alteration stage and a specific magnetic mineralogy could be expected. Textural and mineralo...

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Autores principales:	Gómez, A.L.R., Rubinstein, N.A., Geuna, S.E.
Formato:	JOUR
Materias:	Magnetic mineralog y Porphyry copper Potassic alteration San Rafael Massif Textural/chemical analyses chemical analysis chemical composition copper hydrothermal activity hydrothermal alteration hydrothermal deposit hydrothermal fluid magnetite mineralogy molybdenum porphyry texture Argentina Mendoza
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00044822_v72_n3_p326_Gomez
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00044822_v72_n3_p326_Gomez
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spelling	todo:paper_00044822_v72_n3_p326_Gomez2023-10-03T13:59:09Z Mineralogical analyses of hydrothermal magnetite from the San Pedro Cu-(Mo) porphyry deposit Gómez, A.L.R. Rubinstein, N.A. Geuna, S.E. Magnetic mineralog y Porphyry copper Potassic alteration San Rafael Massif Textural/chemical analyses chemical analysis chemical composition copper hydrothermal activity hydrothermal alteration hydrothermal deposit hydrothermal fluid magnetite mineralogy molybdenum porphyry texture Argentina Mendoza San Rafael Massif The formation of Fe-Ti oxides is controlled by the mineralogy of the host rock and the physico-chemical conditions of the hydrothermal fluids. Therefore a correlation between the mineralogy of a hydrothermal alteration stage and a specific magnetic mineralogy could be expected. Textural and mineralogical analysis of magnetites from the San Pedro porphyry deposit allowed recognizing magnetite veinlets associated to an early potassic stage and disseminated magnetite associated to a late potassic stage, both with slightly differences in MnO and TiO2 contents. Disseminated magnetite includes homogeneous crystals associated with biotitization linked to the late potassic stage and magnetite-ilmenite composite crystals interpreted as a product of magmatic oxi-exsolution. The ilmenite crystals are oxidized to hematite + rutile which are interpreted as a product of oxidation at low temperature in hydrothermal conditions. In veinlets, magnetite show hematitization produced by a long-lived hydrothermal activity which allowed the chemical reequilibration of the igneous magnetite that led to a final composition similar to that of the hydrothermal magnetite. Moreover, slight differences in the chemical composition of the different types of hydrothermal magnetite suggest variations in the ions mobility during the evolution of the hydrothermal system. © 2015, Asociacion Geologica Argentina. All rights reserved. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00044822_v72_n3_p326_Gomez
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Magnetic mineralog y Porphyry copper Potassic alteration San Rafael Massif Textural/chemical analyses chemical analysis chemical composition copper hydrothermal activity hydrothermal alteration hydrothermal deposit hydrothermal fluid magnetite mineralogy molybdenum porphyry texture Argentina Mendoza San Rafael Massif
spellingShingle	Magnetic mineralog y Porphyry copper Potassic alteration San Rafael Massif Textural/chemical analyses chemical analysis chemical composition copper hydrothermal activity hydrothermal alteration hydrothermal deposit hydrothermal fluid magnetite mineralogy molybdenum porphyry texture Argentina Mendoza San Rafael Massif Gómez, A.L.R. Rubinstein, N.A. Geuna, S.E. Mineralogical analyses of hydrothermal magnetite from the San Pedro Cu-(Mo) porphyry deposit
topic_facet	Magnetic mineralog y Porphyry copper Potassic alteration San Rafael Massif Textural/chemical analyses chemical analysis chemical composition copper hydrothermal activity hydrothermal alteration hydrothermal deposit hydrothermal fluid magnetite mineralogy molybdenum porphyry texture Argentina Mendoza San Rafael Massif
description	The formation of Fe-Ti oxides is controlled by the mineralogy of the host rock and the physico-chemical conditions of the hydrothermal fluids. Therefore a correlation between the mineralogy of a hydrothermal alteration stage and a specific magnetic mineralogy could be expected. Textural and mineralogical analysis of magnetites from the San Pedro porphyry deposit allowed recognizing magnetite veinlets associated to an early potassic stage and disseminated magnetite associated to a late potassic stage, both with slightly differences in MnO and TiO2 contents. Disseminated magnetite includes homogeneous crystals associated with biotitization linked to the late potassic stage and magnetite-ilmenite composite crystals interpreted as a product of magmatic oxi-exsolution. The ilmenite crystals are oxidized to hematite + rutile which are interpreted as a product of oxidation at low temperature in hydrothermal conditions. In veinlets, magnetite show hematitization produced by a long-lived hydrothermal activity which allowed the chemical reequilibration of the igneous magnetite that led to a final composition similar to that of the hydrothermal magnetite. Moreover, slight differences in the chemical composition of the different types of hydrothermal magnetite suggest variations in the ions mobility during the evolution of the hydrothermal system. © 2015, Asociacion Geologica Argentina. All rights reserved.
format	JOUR
author	Gómez, A.L.R. Rubinstein, N.A. Geuna, S.E.
author_facet	Gómez, A.L.R. Rubinstein, N.A. Geuna, S.E.
author_sort	Gómez, A.L.R.
title	Mineralogical analyses of hydrothermal magnetite from the San Pedro Cu-(Mo) porphyry deposit
title_short	Mineralogical analyses of hydrothermal magnetite from the San Pedro Cu-(Mo) porphyry deposit
title_full	Mineralogical analyses of hydrothermal magnetite from the San Pedro Cu-(Mo) porphyry deposit
title_fullStr	Mineralogical analyses of hydrothermal magnetite from the San Pedro Cu-(Mo) porphyry deposit
title_full_unstemmed	Mineralogical analyses of hydrothermal magnetite from the San Pedro Cu-(Mo) porphyry deposit
title_sort	mineralogical analyses of hydrothermal magnetite from the san pedro cu-(mo) porphyry deposit
url	http://hdl.handle.net/20.500.12110/paper_00044822_v72_n3_p326_Gomez
work_keys_str_mv	AT gomezalr mineralogicalanalysesofhydrothermalmagnetitefromthesanpedrocumoporphyrydeposit AT rubinsteinna mineralogicalanalysesofhydrothermalmagnetitefromthesanpedrocumoporphyrydeposit AT geunase mineralogicalanalysesofhydrothermalmagnetitefromthesanpedrocumoporphyrydeposit
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Mineralogical analyses of hydrothermal magnetite from the San Pedro Cu-(Mo) porphyry deposit

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