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…
read more
2015: Explotación e intercambio de los recursos naturales para la manufactura de bienes suntuarios
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…
read more
2015: Deposits associated with ultramafic–mafic complexes in Mexico: the Loma Baya case
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…
read more
2015: Thermal metamorphism of mantle chromites and the stability of noble‑metal nanoparticles
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…
read more
2015: 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)
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…
read more
2015: Al- and Cr-rich chromitites from the Eastern Havana-Matanzas ophiolites (Western Cuba)
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…
read more
2015: Re‐Os dating of molybdenite from the Pueblo Viejo (Au‐Ag‐Cu‐Zn) and Douvray Cu‐Au districts
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…
read more
2015: Mineralogía y Geoquímica de Ni, Co, EGP, Sc, REE en Yacimientos Lateríticos
To Cite this article: Proenza, J.A. (2015): Mineralogía y Geoquímica de Ni, Co, EGP, Sc, REE en Yacimientos Lateríticos. Macla, 20, 3-9.
read more
2015: 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
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…
read more
2014: Geodynamic implications of ophiolitic chromitites in the La cabaña ultramafic bodies, Central Chile
Geodynamic implications of ophiolitic chromitites in the La cabaña ultramafic bodies, Central Chile Abstract Chromitites (>80% volume chromite) hosted in two ultramafic bodies (Lavanderos and Centinela Bajo) from the Palaeozoic metamorphic basement of the Chilean Coastal Cordillera were studied in terms of their chromite composition, platinum-group element (PGE) abundances, and Re-Os isotopic systematics. Primary chromite…
read more
2014: Alteration patterns of chromian spinels from La Cabaña peridotite, south-central Chile
Alteration patterns of chromian spinels from La Cabaña peridotite, south-central Chile Abstract La Cabaña peridotite is part of a dismembered ophiolite complex located within the metamorphic basement of the Coastal Cordillera of south-central Chile, and is the only location in Chile were Cr-spinels have been described so far. The La Cabaña peridotite is part of…
read more
2014: Late Jurassic terrane collision in the northwestern margin of Gondwana (Cajamarca complex, eastern flank of the central cordillera, Colombia)
Late Jurassic terrane collision in the northwestern margin of Gondwana (Cajamarca complex, eastern flank of the central cordillera, Colombia) Abstract Medium-grade metabasites and metapelites from the Cajamarca Complex (Central Cordillera of Colombia) are in fault contact with the Jurassic Ibague batholith and show a penetrative foliation, locally mylonitic, suggesting intense dynamic–thermal metamorphism. The amphibolites are…
read more
2014: Chromitites in ophiolites: How, where, when, why? Part II. The crystallization of chromitites
Chromitites in ophiolites: How, where, when, why? Part II. The crystallization of chromitites Abstract A review of previous work relevant to the formation of concentrations of chromite in peridotites from ophiolitic (s.l.) sequences highlights some of the key problems in understanding the complex processes involved. This review forms the basis for chromitite-genesis models that integrate…
read more
2014: 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) of the Moa-Baracoa metamorphic sole (eastern Cuba)
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…
read more
2014: Garnierites and garnierites: Textures, mineralogy and geochemistry of garnierites in the Falcondo Ni-laterite deposit, Dominican Republic
Garnierites and garnierites: Textures, mineralogy and geochemistry of garnierites in the Falcondo Ni-laterite deposit, Dominican Republic Abstract Garnierites (Ni–Mg-bearing phyllosilicates) are significant ore minerals in Ni-laterites of the hydrous silicate-type. In the Falcondo Ni-laterite deposit (Dominican Republic), garnierites are found within the saprolite horizon mainly as fracture-fillings and thin coatings on joints. Field observations indicate…
read more
2013: Pre-Columbian jadeitite artifacts from the Golden Rock Site, St. Eustatius, Lesser Antilles, with special reference to jadeitite artifacts from Elliot’s, Antigua: Implications for potential source regions and long-distance exchange networks in the Greater Caribbean
Pre-Columbian jadeitite artifacts from the Golden Rock Site, St. Eustatius, Lesser Antilles, with special reference to jadeitite artifacts from Elliot’s, Antigua: Implications for potential source regions and long-distance exchange networks in the Greater Caribbean Abstract A detailed electron microscopy analysis of jadeitite celts from the Early Ceramic Age Golden Rock settlement on the small volcanic…
read more
2013: First description of a metamorphic sole related to ophiolite obduction in the northern Caribbean: Geochemistry and petrology of the Güira de Jauco amphibolite complex (eastern Cuba) and tectonic implications
First description of a metamorphic sole related to ophiolite obduction in the northern Caribbean: Geochemistry and petrology of the Güira de Jauco amphibolite complex (eastern Cuba) and tectonic implications Abstract The Güira de Jauco Amphibolite Complex underlies the Mayarí–Baracoa Ophiolitic Belt (eastern Cuba) and is composed of highly foliated amphibolite, locally with blocks of sheared…
read more
2013: Late Cretaceous subduction of the continental basement of the Maya block (Rabinal granite, central Guatemala): Tectonic implications for the geodynamic evolution of Central America
Late Cretaceous subduction of the continental basement of the Maya block (Rabinal granite, central Guatemala): Tectonic implications for the geodynamic evolution of Central America Abstract The Rabinal Granite is a peraluminous S–type composite pluton formed upon partial melting of a metasedimentary source region that fringes the southernmost North America plate in central Guatemala. It is…
read more
2013: “Garnierite” ore and Ni-serpentine mineralizations from the Falcondo Ni-laterite deposit (Dominican Republic): an approach from quantitative XR element imaging
"Garnierite" ore and Ni-serpentine mineralizations from the Falcondo Ni-laterite deposit (Dominican Republic): an approach from quantitative XR element imaging Abstract ”Garnierites” and Ni-serpentines are the main Ni ores in hydrous silicate-type Ni-laterites. In the Falcondo Ni-laterite, “garnierites” are found within the saprolite horizon mainly as fracture-fillings and thin coatings on joints. Different greenish colours are…
read more
2012: Hydrothermal origin and age of jadeitites from Sierra del Convento Mélange (Eastern Cuba)
Hydrothermal origin and age of jadeitites from Sierra del Convento Mélange (Eastern Cuba) Abstract Jadeitite (jadeite jade) from Sierra del Convento (eastern Cuba) occurs in a subduction-related serpentinite-matrix mélange associated with a variety of high-pressure tectonic blocks including garnet-amphibolites and related anatectic trondhjemites. The eastern Cuban jadeitite is massive and characterized by rare quartz inclusions…
read more