Mineralizations of the Lavalleja group (Uruguay) , a probable neoproterozoic volcano-sedimentary sequence

The Lavalleja Group is located in the southern extreme of the Dom Feliciano Belt, being tentatively correlated with the Porongos and Brusque Groups of Brazil. The basement of the Lavalleja Group is probably represented by granitic-gneissic rocks of the Campanero Unit with ages, in the southern porti...

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Autores principales: Sánchez-Bettucci, L., Oyhantçabal, P., Loureiro, J., Ramos, V.A, Preciozzi, F., Basei, M.A.S.
Formato: JOUR
Materias:
Besshy type
Brasiliano
Mineralizations
Neoproterozoic
SEDEX Zn-Pb
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_1342937X_v7_n3_p745_SanchezBettucci
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_1342937X_v7_n3_p745_SanchezBettucci2023-10-03T16:09:41Z Mineralizations of the Lavalleja group (Uruguay) , a probable neoproterozoic volcano-sedimentary sequence Sánchez-Bettucci, L. Oyhantçabal, P. Loureiro, J. Ramos, V.A Preciozzi, F. Basei, M.A.S. Besshy type Brasiliano Mineralizations Neoproterozoic SEDEX Zn-Pb The Lavalleja Group is located in the southern extreme of the Dom Feliciano Belt, being tentatively correlated with the Porongos and Brusque Groups of Brazil. The basement of the Lavalleja Group is probably represented by granitic-gneissic rocks of the Campanero Unit with ages, in the southern portion, ranging from 1.75 to 2.1 Ga (U-Pb in zircon). The Lavalleja Group is characterized by narrow bands of metasedimentary and metavolcanic rocks and it is separated in three formations, namely (from base to top): Zanja del Tigre, Fuente del Puma and Minas. Outcrops assigned to the Minas Formation have been recently correlated with the Arroyo del Soldado Group. Only the Fuente del Puma formation hosts base metals, Au and Ag ocurrences. The Fuente del Puma formation is divided into three informal units: sedimentary, volcanic and hornblenditic gabbros. The sedimentary unit is characterized by an important amount of carbonates. Syncollisional to post-tectonic granitic bodies (Carapé Complex) intrudes the Lavalleja Group and the Campanero Unit. Several mineralizations are located in the Fuente del Puma Formation, those associated to Arrospide, Ramallo-Reus, Chape, Valencia, La Oriental, Apolonia, Redondo Hill, La China and La Paloma mines are the most important. In addition, many ocurrences of Cu-Zn-Pb were recognized in the region. The Cu-Zn-Pb mineralization includes massive sulfides with pyrite-chalcopyrite-sphalerite-galena-pyrrothyte, arsenopyrite-hematite into small bodies with lenticular shape. The host rock shows frequently hydrothermal alteration. The geochemistry and the geological features of the mineralizations suggest Besshi Massive Sulphide Zn-Cu-Pb and SEDEX Zn-Pb as most probably genetic models for the deposits related to the Neoproterozoic orogeny. Early mineralizations are syngenetic and were formed on the sea floor, although the main mineralizations are related to remobilization during syn- to late-metamorphic events and thrusting. © 2004 International Association for Gondwana Research, Japan. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_1342937X_v7_n3_p745_SanchezBettucci
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Besshy type
Brasiliano
Mineralizations
Neoproterozoic
SEDEX Zn-Pb
spellingShingle Besshy type
Brasiliano
Mineralizations
Neoproterozoic
SEDEX Zn-Pb
Sánchez-Bettucci, L.
Oyhantçabal, P.
Loureiro, J.
Ramos, V.A
Preciozzi, F.
Basei, M.A.S.
Mineralizations of the Lavalleja group (Uruguay) , a probable neoproterozoic volcano-sedimentary sequence
topic_facet Besshy type
Brasiliano
Mineralizations
Neoproterozoic
SEDEX Zn-Pb
description The Lavalleja Group is located in the southern extreme of the Dom Feliciano Belt, being tentatively correlated with the Porongos and Brusque Groups of Brazil. The basement of the Lavalleja Group is probably represented by granitic-gneissic rocks of the Campanero Unit with ages, in the southern portion, ranging from 1.75 to 2.1 Ga (U-Pb in zircon). The Lavalleja Group is characterized by narrow bands of metasedimentary and metavolcanic rocks and it is separated in three formations, namely (from base to top): Zanja del Tigre, Fuente del Puma and Minas. Outcrops assigned to the Minas Formation have been recently correlated with the Arroyo del Soldado Group. Only the Fuente del Puma formation hosts base metals, Au and Ag ocurrences. The Fuente del Puma formation is divided into three informal units: sedimentary, volcanic and hornblenditic gabbros. The sedimentary unit is characterized by an important amount of carbonates. Syncollisional to post-tectonic granitic bodies (Carapé Complex) intrudes the Lavalleja Group and the Campanero Unit. Several mineralizations are located in the Fuente del Puma Formation, those associated to Arrospide, Ramallo-Reus, Chape, Valencia, La Oriental, Apolonia, Redondo Hill, La China and La Paloma mines are the most important. In addition, many ocurrences of Cu-Zn-Pb were recognized in the region. The Cu-Zn-Pb mineralization includes massive sulfides with pyrite-chalcopyrite-sphalerite-galena-pyrrothyte, arsenopyrite-hematite into small bodies with lenticular shape. The host rock shows frequently hydrothermal alteration. The geochemistry and the geological features of the mineralizations suggest Besshi Massive Sulphide Zn-Cu-Pb and SEDEX Zn-Pb as most probably genetic models for the deposits related to the Neoproterozoic orogeny. Early mineralizations are syngenetic and were formed on the sea floor, although the main mineralizations are related to remobilization during syn- to late-metamorphic events and thrusting. © 2004 International Association for Gondwana Research, Japan.
format JOUR
author Sánchez-Bettucci, L.
Oyhantçabal, P.
Loureiro, J.
Ramos, V.A
Preciozzi, F.
Basei, M.A.S.
author_facet Sánchez-Bettucci, L.
Oyhantçabal, P.
Loureiro, J.
Ramos, V.A
Preciozzi, F.
Basei, M.A.S.
author_sort Sánchez-Bettucci, L.
title Mineralizations of the Lavalleja group (Uruguay) , a probable neoproterozoic volcano-sedimentary sequence
title_short Mineralizations of the Lavalleja group (Uruguay) , a probable neoproterozoic volcano-sedimentary sequence
title_full Mineralizations of the Lavalleja group (Uruguay) , a probable neoproterozoic volcano-sedimentary sequence
title_fullStr Mineralizations of the Lavalleja group (Uruguay) , a probable neoproterozoic volcano-sedimentary sequence
title_full_unstemmed Mineralizations of the Lavalleja group (Uruguay) , a probable neoproterozoic volcano-sedimentary sequence
title_sort mineralizations of the lavalleja group (uruguay) , a probable neoproterozoic volcano-sedimentary sequence
url http://hdl.handle.net/20.500.12110/paper_1342937X_v7_n3_p745_SanchezBettucci
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