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Abstract:

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.

Registro:

Documento: Artículo
Título:Mineralizations of the Lavalleja group (Uruguay) , a probable neoproterozoic volcano-sedimentary sequence
Autor:Sánchez-Bettucci, L.; Oyhantçabal, P.; Loureiro, J.; Ramos, V.A; Preciozzi, F.; Basei, M.A.S.
Filiación:Departamento de Geología, Instituto de Geologia Paleontologia, Facultad de Ciencias, Iguá 4225, Montevideo 11400, Uruguay
DINAMIGE, Uruguay
Departamento Ciencias Geologicas, Laboratorio de Tectonica Andina, Facultad Ciencias Exactas Naturales, Ciudad de Buenos Aires 1428, Argentina
Instituto de Geociencias, Universidade de São Paulo, São Paulo, Brazil
Palabras clave:Besshy type; Brasiliano; Mineralizations; Neoproterozoic; SEDEX Zn-Pb
Año:2004
Volumen:7
Número:3
Página de inicio:745
Página de fin:751
DOI: http://dx.doi.org/10.1016/S1342-937X(05)71060-1
Título revista:Gondwana Research
Título revista abreviado:Gondwana Res.
ISSN:1342937X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1342937X_v7_n3_p745_SanchezBettucci

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Citas:

---------- APA ----------
Sánchez-Bettucci, L., Oyhantçabal, P., Loureiro, J., Ramos, V.A, Preciozzi, F. & Basei, M.A.S. (2004) . Mineralizations of the Lavalleja group (Uruguay) , a probable neoproterozoic volcano-sedimentary sequence. Gondwana Research, 7(3), 745-751.
http://dx.doi.org/10.1016/S1342-937X(05)71060-1
---------- CHICAGO ----------
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" . Gondwana Research 7, no. 3 (2004) : 745-751.
http://dx.doi.org/10.1016/S1342-937X(05)71060-1
---------- MLA ----------
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" . Gondwana Research, vol. 7, no. 3, 2004, pp. 745-751.
http://dx.doi.org/10.1016/S1342-937X(05)71060-1
---------- VANCOUVER ----------
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. Gondwana Res. 2004;7(3):745-751.
http://dx.doi.org/10.1016/S1342-937X(05)71060-1