(PDF) Platinum group elements and Os isotope systematic in chromite …
The chemical composition of chromite ores from the Mayarí-Baracoa Ophiolitic Belt in eastern Cuba is highly variable in terms of Cr# (from 0.43 to 0.83), bulk PGE contents (from 18 ppb to 3,7 ppm ...
Gravity prospecting for chromite deposits in Camaguey Province, Cuba
Detailed gravity surveys were made in Camaguey Province, Cuba, as part of a systematic exploration program conducted by the U. S. Geological Survey on behalf of the General Services Administration to locate deposits of refractory‐grade chromite.
Chromite: The only mineral ore of chromium metal
Chromite is an oxide mineral composed of chromium, iron, and oxygen (FeCr 2 O 4 ). It is dark gray to black in color with a metallic to submetallic luster and a high specific gravity. It occurs in basic and ultrabasic igneous rocks and in the metamorphic and sedimentary rocks that are produced when chromite-bearing rocks are altered by heat or ...
Spectroscopic characterization of chromite from the Moa …
The present work was prompted to examine the spectroscopic characterization of chromite ores of refractive grade from the Moa-Baracoa, Cuba as …
Uvarovite in podiform chromitite: The Moa …
The chromitite pods of the Moa-Baracoa massif, in the eastern ophiolitic belt of Cuba, contain pre-existing gabbro sills. This association is affected by two processes of hydrothermal alteration.
Gravity prospecting for chromite deposits in Camaguey Province, Cuba
Detailed gravity surveys were made in Camaguey Province, Cuba, as part of a systematic exploration program conducted by the U. S. Geological Survey on behalf of the General Services Administration to locate deposits of refractory‐grade chromite. During the period August 4, 1954, to April 5, 1956, a total of 41,921 gravity stations were established in …
Geology and chromite deposits of the Camaguey district, …
The Camagiiey chromite district, near the city of Camagiiey, Cuba, has supplied a substantial part of the refractory-grade chromite used in this country during the war. The ore occurs in a complex that consists mainly of serpentinized peridotite and dunite with minor amounts of gabbro, troctolite, and anorthosite. The complex was intruded into …
Nanoscale partitioning of Ru, Ir, and Pt in base-metal …
Nanoinclusions of Pt-Ir compounds in Rh-rich Pn, as in the Caridad chromite deposit of Cuba, are not considered to be exsolution products, but rather assumed to be formed in a silicate melt and ...
Petrology and structure of the Moa Chromite district, …
Chromite deposits In the Moa district, on the north coast of Oriente Province, Cuba, form one facies of the ultramafic complex in which they occur. Two planar structures, one a compositional layering due to variations in the relative proportions of olivine, pyroxene, plagioclase feldspar, and chromite, and the other a foliation caused by the orientation of …
Chromite
SEM image of polished specimen. Grey in BSE grain of Chromite (note that this is the real, analyticaly confirmed Chromite) is intersected by more bright veinlets of Chrommagnetite and overgrown by most bright …
UVAROVITE IN PODIFORM CHROMITITE: THE MOA …
chromite Cr and A1 would have been mobile only at the scale of a pod during this process. Keywords: uvarovite, zoning, hydrothermal, chromitite, ophiolite, Moa-Baracoa massif, Cuba SorratraeJns Les lentilles de chromitite du massif de Moa-Baracoa, dans la partie orientale de la ceinture ophiolitique de Cuba, contient des filon-couches de gabbro.
Chromite | Chromium Ore, Properties, Uses and Occurrence
Chromite is an oxide mineral that an iron chromium oxide with formula: FeCr2O4. It is belonging to the spinel group. Chromite is the most important ore of chromium. ... From the Moa district, northern Cuba. On Luzon, Philippines. From the Stillwater complex, Montana, USA. References • Bonewitz, R. (2012). Rocks and …
A hypothesis of origin for podiform chromite deposits
The Camagiiey chromite district, near the city of Camagiiey, Cuba, has supplied a substantial part of the refractory-grade chromite used in this country during the war. The ore occurs in a complex … Expand
Petrology and structure of the Moa Chromite district, …
April 30, 1947. Chromite deposits In the Moa district, on the north coast of Oriente Province, Cuba, form one facies of the ultramafic complex in which they occur.
Gravity prospecting for chromite deposits in Camaguey Province, Cuba
Detailed gravity surveys were made in Camaguey Province, Cuba, as part of a systematic exploration program conducted by the U. S. Geological Survey on behalf of the General Services Administration to locate deposits of refractory-grade chromite. During the period August 4, 1954, to April 5, 1956, a total of 41,921 gravity stations were established in …
Chromite in the hyperbasite belt of cuba
The Caridad chromite deposit is one of the ten Cr-rich chromite ore bodies being mined for Cr in the small mining district of Sagua de Tánamo in Cuba ( González-Jiménez et al., 2011).
CHROMITE IN THE HYPERBASITE BELT OF CUBA
International Geology Review. List of Issues. Volume 31, Issue 1. CHROMITE IN THE HYPERBASITE BELT OF CUBA.
Os isotope heterogeneity of the upper mantle: Evidence …
In an attempt to quantify the extent of geochemical heterogeneity within a restricted and well dated portion of the upper mantle, 27 chromite separates from the 90 My old chromite deposits in the Mayarí–Baracoa ophiolite belt in eastern Cuba have been investigated for platinum group element (PGE) concentrations and Re–Os isotopic …
GEOLOGY AND CHROMITE DEPOSITS OF THE …
The Camagiiey chromite district, situated in the north-central portion of the province of Camagiiey, Cuba (see fig. 1), has supplied refractory- grade chromite for about 20 years. The output averaged about 40,000 long tons per year prior to 1941, but under the stimulus of war needs
High-Cr and high-Al chromitites from the Sagua de Tánamo …
High-Cr and high-Al chromitites from the Sagua de Tánamo district, Mayarí-Cristal ophiolitic massif (eastern Cuba): Constraints on their origin from mineralogy and …
Gravimeter prospecting for chromite in Cuba
Abstract. As a contribution to the War Production Board's program of exploration for strategic minerals and under an arrangement with the Bethlehem Steel Company, Gulf Research and Development Company, in early 1942, made gravimeter surveys in the chromite bearing Camaguey District, Cuba. One large chromite deposit, under and …
CASE STUDIES OF CHROMITE ORE PROSPECTING IN CAMAGÜEY, CUBA …
Download Citation | CASE STUDIES OF CHROMITE ORE PROSPECTING IN CAMAGÜEY, CUBA | There are abundant ophiolites in Cuba and many of the ultramafic sections host important chromite bodies. The ...
Distribution of platinum-group elements and Os isotopes in chromite …
The Mayarí-Baracoa ophiolitic belt in eastern Cuba hosts abundant chromite deposits of historical economic importance. Among these deposits, the chemistry of chromite ore is very variable, ranging from high Al (Cr#=0.43–0.55) to high Cr (Cr#=0.60–0.83) compositions. Platinum-group element (PGE) contents are also variable …
Podiform Chromite Deposits—Database and Grade and …
This PDF document provides a comprehensive overview of the geology, mineralogy, geochemistry, and geophysics of podiform chromite deposits, which are the main source of chromium metal and chemical products. It also presents grade and tonnage models for estimating the resources and economic potential of these deposits worldwide.
Chromite deposits of the Sagua-Baracoa range, Eastern …
largest chromite body of Cuba with a thickness varying between 1 and 16 m. Its original width is estimated as 200-250 m. Thus, the dimensions of this lens are commensurate with those of the Coto ore-body, one of the largest known podiform chromite bodies of the world (600x 300 x 8Om) at the Masinloc mine, PhiJippines (Dickey 1975).
A hypothesis of origin for podiform chromite deposits
Podiform chromite deposits are lenticular, chromite-rich autoliths in deformed dun-ites and harzburgites of ophiolite complexes. ... There are extraordinary podiform chromite deposits in Cuba (THAYER, 1946) t h a t have a troctolite matrix, and there are unusual occurrences in which the chromite has a clinopyroxene matrix [e.g. Celebration …
Chromite: The mineral Chromite information and pictures
The Mineral chromite. Chromite, the principle ore of the element chromium, is a commercially valuable mineral. However, due to mining restrictions and the fact that Chromite is not commonly found in crystallized form, it is not well-represented in mineral collections. Chromite is isomorphous with the mineral Magnesiochromite and is easily ...
Spectroscopic characterization of chromite from the Moa …
The Raman spectrum of chromite shows three bands in the CrO stretching region at 730, 560 and 445 cm(-1). The most intense peak at 730 cm(-1) is identified as symmetric stretching vibrational mode, A1g(nu1) and the other two minor peaks at 560 and 445 cm(-1) are assigned to F2g(nu4) and E(g)(nu2) modes, respectively.
Gravity prospecting for chromite deposits in Camaguey …
Camaguey. Detailed gravity surveys were made in Camaguey Province, Cuba, as part of a systematic exploration program conducted by the U. S. Geological Survey on behalf of …
Spectroscopic characterization of chromite from the Moa …
Request PDF | Spectroscopic characterization of chromite from the Moa-Baracoa Ophiolitic Massif, Cuba | The Cuban chromites with a spinel structure, FeCr2O4 have been studied using optical ...
Los depósitos de cromita en complejos ofiolíticos: discu …
Chromite deposits are Cr-rich, with Cr# ranging between O. 70 and 0.80. Disseminated chromite from the enclosing dunite exhibits similar Cr# (0.70-0.74) than that of the associated chromitite, and accesory chromite from the associated harzburgite shows lower Cr# (0.56-0.69). The Mayarí chromitites are
Mayarí-Baracoa Belt, Holguín Province, Cuba
Mayarí-Baracoa Belt, Holguín Province, Cuba : Paired ophiolitic belt in eastern Cuba with podiform chromite bodies and nickel deposits in the weathering crusts of ultramafic massifs. Contains some 174 chromite deposits.
X-ray photoelectron spectroscopy characterization of natural chromite …
The relative proportions of Fe 3+ and Fe 2+ are usually estimated from electron microprobe analysis (EPMA) assuming chromite X-ray photoelectron spectroscopy characterization of natural chromite from Mercedita Mine (Eastern Cuba): quantification of the Fe 3+ /Fe 2+ ratio | Isabel Fanlo Gonzalez and Silvia Irusta - Academia.edu
Gravity prospecting for chromite deposits in Camaguey …
Geology and chromite deposits of the Camaguey district, Camaguey Province, Cuba. The Camagiiey chromite district, near the city of Camagiiey, Cuba, has supplied a …
Distribution of platinum-group elements and …
The Mayarí-Baracoa ophiolitic belt in eastern Cuba hosts abundant chromite deposits of historical economic importance. Among these deposits, the chemistry of chromite ore is very variable ...
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