Category Archives: 2015

Weathering profile of the Cerro de Maimón VMS deposit (Dominican Republic): textures, mineralogy, gossan evolution and mobility of gold and silver Abstract Cerro de Maimón, in the central Dominican Republic, is currently the only VMS deposit under production in the Caribbean region. It is hosted in the Maimón Formation, of early Cretaceous age, which is…

Platinum group minerals (PGM) in the Falcondo Ni-laterite deposit, Loma Caribe peridotite (Dominican Republic) Abstract Two Ni-laterite profiles from the Loma Caribe peridotite (Dominican Republic) have been investigated for their platinum group element (PGE) geochemistry and mineralogy. One profile (Loma Peguera) is characterized by PGE-enriched (up to 3.5 ppm total PGE) chromitite bodies incorporated within the…

To Cite this article: Cullen K., Beaubien H., García-Casco A., Harrison A., Jiménez M., Martín Seijo M., Mayo Torné J., Mayo Torné C., Pomo González, J.C. (2015): Explotación e intercambio de los recursos naturales para la manufactura de bienes suntuarios. En: "Guerreros de Oro: Los Señores de Río Grande", pp. 88-115 (part: "Naturaleza y origen…

Deposits associated with ultramafic–mafic complexes in Mexico: the Loma Baya case Abstract Several ultramafic–mafic complexes of assumed ophiolitic affinity that contain ore deposits occur mostly along the Pacific margin of Mexico and the boundaries of the Guerrero composite terrane, which have been described in association with various tectonomagmatic settings. These are (1) roots of volcanic…

Thermal metamorphism of mantle chromites and the stability of noble‑metal nanoparticles Abstract The Loma Baya complex in south-western Mexico is a volume of chromitite-bearing oceanic mantle that records a complex metamorphic history, defined by a first stage of hydrous metamorphism overprinted by a short-lived thermal event associated with an Eocene granite intrusion. During the hydrous…

Did the Turonian–Coniacian plume pulse trigger subduction initiation in the Northern Caribbean? Constraints from 40Ar/39Ar dating of the Moa-Baracoa metamorphic sole (eastern Cuba) Abstract The Güira de Jauco metamorphic sole, below the Moa-Baracoa ophiolite (eastern Cuba), contains strongly deformed amphibolites formed at peak metamorphic conditions of 650–660°C, approximately 8.6 kbar (~30 km depth). The geochemistry, based on…

Al- and Cr-rich chromitites from the Eastern Havana-Matanzas ophiolites (Western Cuba) Abstract Chromite deposits in the Havana-Matanzas ophiolites of Western Cuba include both Al- ([Cr/(Cr+Al)=0.44- 0.46]) and Cr-rich ([Cr/(Cr+Al) = 0.65-0.74] chromitites that commonly occur in the upper part of mantle ectonites near the mantle-crust transition zone. These chromitites generally form small lenticular bodies spatially…

Re‐Os dating of molybdenite from the Pueblo Viejo (Au‐Ag‐Cu‐Zn) and Douvray Cu‐Au districts Abstract Re-Os dating of three samples of hydrothermal molybdenite collected from the Pueblo Viejo Au-Ag-Cu district (5.5 Moz gold, past production, 16.2 Moz proven plus probable gold ore reserves) yields ages of 112.1 ± 0.4, 112.0 ± 0.4, and 111.5 ± 0.4…

To Cite this article: Proenza, J.A. (2015): Mineralogía y Geoquímica de Ni, Co, EGP, Sc, REE en Yacimientos Lateríticos. Macla, 20, 3-9.

Ruthenium and magnetite intergrowths from the Loma Peguera chromitite, Dominican Republic, and relevance to the debate over the existence of platinum-group element oxides and hydroxides Abstract Two small grains, about 50 × 60 × 70 μm in size, occurring in the chromitite associated with the altered harzburgite of Loma Peguera (Dominican Republic) have been investigated…

Andreu, E., Torró, L., Proenza, J.A., Doménech, C., García Casco, A., Villanova de Benavent, C., Chavez, C., Espaillat, J., and Lewis, J.F. (2015): Weathering profile of the Cerro de Maimón VMS deposit (Dominican Republic): textures, mineralogy, gossan evolution and mobility of gold and silver. Ore Geology Reviews 65, 165-179