· This Special Issue will focus on recent advances in the study of geology, mineralogy, and geochemistry of chromite deposits from different geological settings for improving our knowledge in chromite ore formation. Contributions dealing with experimental mineralogy and petrology of chromite and related minerals are also welcome.
Chromite has been mined from four different deposit types: stratiform chromite, podiform chromite, placer chromite, and laterite deposits. Most of the world's resources, however, are loed in stratiform chromite deposits, such as the Bushveld Complex in South Africa.
podiform deposits. ŁKind of deposits ŁAlmost all chromite deposits are magmatic segregation in ultrabasic rocks. Chromite occurs in the host rock as masses, lenses, and dissemination. ŁAll economic deposits of chromite are in ultrabasicrocks and are either stratiform in layered intrusions (98% of world™s chromite resources) or podiform
Short Communiion Textural Evidence for the ChromiteOversaturated Character of the Melt Involved in Podiform Chromitite Formation Betchaida D. Payot,1,2 Shoji Arai,1 Rodolfo A. Tamayo Jr†,2 and Graciano P. Yumul Jr3 1Department of Earth Sciences, Kanazawa University, Kakuma, Ishikawa, Japan, 2National Institute of Geological Sciences, University of the Philippines, Diliman ...
· The ores are considered as podiform chromite ores characterized by relatively small sizes, irregular shapes and limited lateral continuity. In the structural point of view BulqizaBatra chromite deposit is widely accepted to be hosted by an overturned antiform, with easterly vergence, km long, to km wide and to km down dip with an axial orientation strike 330 0.
some investigators to conclude that podiform chromite deposits tend to occur at or near (within 1km) the Moho discontinuity, or transition zone between the overlying cumulate and underlying tectonite zones of ophiolite sequences (Yigit, 2008). Chromite ore may have a sharp or gradational contact with its hosting
Podiform chromite ore bodies in different shapes and sizes (potato, pipe, pod, tabular, folded etc.) can be seen at different stratigraphic levels of the harzburgites of the ophiolite. Podiform ore bodies are affected by plastic deformation during forming of pods and also by different degrees of tectonic deformation during and after emplacement.
Podiform chromite deposits occur in peridotite and mafic complexes of alpine type, and are tabular, pencilshaped, or irregular in form. In contrast with stratiform deposits, whose textures and structures reflect crystal settling and suggest analogies with sedimentary rocks, the textures of podiform deposits reflect extensive flowage, under magmatic conditions, as a stiff crystal mush and ...
Chromite ((Mg, Fe++)(Cr, Al, Fe+++)2O4) is the only source for the metallic element chromium, which is used in the metallurgical, chemical, and refractory industries. Podiform chromite deposits are small magmatic chromite bodies formed in the ultramafic section of an ophiolite complex in the oceanic crust. These deposits have been found in midoceanic ridge, offridge, and suprasubduction ...
two hundred small, podiformlike ore bodies in the massif. As a result of mining, only a few "in situ" chromitite bodies remain. Field data, along with the data reported by Payakov et al. (1961) and ZhelyaskovaPanayotova et al. (2000), suggest that chromite ore bodies form single, .
Exploration models for podiform chromite in the MedfordCoos Bay quadrangles must consider the facts that (1) one deposit occurs for every 5 km 2 of ultramafic outcrop; similarly for a 5 km 3 volume, and (2) the average deposit has a tonnage of 206 tonnes, a volume .
Podiform Chromite Deposits—Database and Grade . rotary dryew for chromium or chromite ore. rotary dryer for chromium and chromite rotary dryer for chromium and chromite . rotary dryer for chrome ore. Rotary Dryer For Chrome Ore rotary dryer for chrome ore,CCMcrusher MachineChrome Ore .
Podiform chromitites occur in the mantle sequences of many ophiolites and are composed of magnesiochromite6olivine ... chromite in different types of ores [Xiong et al., 2015] indies more heterogeneous distribution of Fe and Key Points: All chromites have Fe isotopic
· Abstract. This paper presents an attempt to interpret the formation of podiform chromite ore found in ophiolitic complexes from magmatic accumulation inside cavities along the basalt conduits feeding the main magma chamber.
· Chromite, an oxide of iron, magnesium, aluminum, and chromium, is the only ore mineral of chromium. In nature, chromite deposits are generally of two major types: stratiform (layered) and podiform (pod shaped). Both types are associated with ultramafic igneous rocks.
Stratiform, Podiform, and Beach Sands. Small amounts of chromite are found in many types of rock. However, chromite deposits that are large enough for mining are generally found in: 1) stratiform deposits (large masses of igneous rock such as norite or peridotite that slowly crystallized from subsurface magma); 2) podiform deposits (serpentines and other metamorphic rocks derived from .
Chromites from the ore zone are at the Crrich extreme for podiform chromites (Cr# ave. ) and are TiO2 poor (ave. wt%), similar to chromite in boninite worldwide and nearby. Al/Ti ratios have been used to calculate the composition of the parent melts from which the Voskhod podiform chromitite crystallised: compositions that are synonymous with a boninite melt composition.
Podiform chromite deposits are characteristic of the ultramafic complexes of the ophiolites. In the Limassol Forest Plutonic Complex, one of the two plutonic complexes of Troodos ophiolite, Cyprus, the deposits are loed dominantly at the periphery of the serpentinite body either close to the contact between the serpentinized harzburgite (Bastite Serpentinite) and a highly aclastic ...
· However, due to podiform nature of the chromite, underground mining is also done. Use of donkeys for hauling the ore from underground is still in practice. The haulage machinery is also used.
· Kospiri, Aleksander. "Integrated Geophysical Surveys For Searching of Podiform Chromite In Albania." Paper presented at the 1999 SEG Annual Meeting, Houston, Texas, October 1999.
chromite ore subsequently transformed to ferritchromit and magnetite in variable proportions. The ratio of magnetite to chromite ranges from to The highest magnetite valueb are seen in deformed, finegrained ore. The periphery of chromite core and an intermediate zone of ferritchromit contain up to MnO.
LAGO, B. L., RABINOWICZ, M., NICOLAS, A. (1982) Podiform Chromite Ore Bodies: a Genetic Model. Journal of Petrology, 23 (1). 103125 doi:/petrology/
PODIFORM CHROMITE M03 by Chris Ash1 Modified for Yukon by A. Fonseca Refer to preface for general references and formatting significance. May 30, 2005. IDENTIFICATION SYNONYMS: Alpine type; ophiolite hosted chromite. COMMODITIES (BYPRODUCTS): Chromite (may contain platinum group elements Os, Ir and Ru).
· I belong to a specialized group on LinkedIn where people ask and answer questions related to mining geophysics. One question came in recently about podiform chromite deposits. Chromite is chromeironoxide ore, typically an extremely dense black rock. I have a small 25kg (55 lbs) sample on our back deck – it's only about the size of a ...
