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chromite is closely associated with

chromite is closely associated with

Chromite - an overview ScienceDirect Topics

Magmatic deposits of chromium are essentially monomineralic bodies of chromitite found closely associated with mafic or ultramafic silicate rocks. The melting point of chromite is greater than the liquidus temperature of any recognized terrestrial magma type, making an origin as a Cr-rich oxide liquid very unlikely and favoring their origins as ...

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Chromite - an overview ScienceDirect Topics

Chloritization of the chromite was broadly contemporaneous with the alteration to ferritchromite (Fleet et al., 1993). Platinum-group mineralization occurs in stratigraphic layering of the ultramafic (iron–magnesium-rich) body. The PGEs are associated with chromite. The PGEs are also more closely related with minor sulfide concentrations.

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Chromite‐bearing quartzite in the southern fringe of ...

The chromite-bearing quartzite from Ghutrigaon shows typical sedimentary features, such as colour banding, cross-bedding, broomsticks, and slump structures and is

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Chromite‐bearing quartzite in the southern fringe of ...

2021-2-25  The chromite‐bearing quartzite from Ghutrigaon shows typical sedimentary features, such as colour banding, cross‐bedding, broomsticks, and slump structures and is closely associated with large volumes of volcanic tuff. The chromite‐bearing quartzite contains major quartz and chromite along with minor accessories such as fuchsite, chromian ...

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Chromite: Mineral information, data and localities.

Chromite is the most important chromium ore mineral. It forms a complete solid solution series with many other members of the group, eg. in the Chromite-Hercynite Series, Chromite-Spinel Series, Chromite-Magnetite Series and the Chromite-Magnesiochromite Series.It is the iron analogue of Zincochromite, Cochromite, Manganochromite and Magnesiochromite and the Cr analogue of Hercynite ...

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A NEW OCCURRENCE OF PHOSPHORAN OLIVINE IN

2021-1-12  pyroxene associated with P-rich olivine is highlighted in red. P-rich olivine was found closely associated with troilite, chromite, nickelphosphide (Ni,Fe) 3.1–3.2 P, mer-rillite (inferred from EDS), and orthopyroxene (Fig. 3). Troilite and nickelphosphide have two size groups, the coarse-grained and the fine-grained group, the latter

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Thick chromitite of the Jacurici Complex (NE Craton São ...

2017-11-1  Clinopyroxene is rare, and magmatic colorless amphibole may occur in some layers, mainly in the UUU, as well as phlogopite, which is closely associated with chromite. On the other hand, the Ultramafic Zone rocks from the segments that outcrop to the north are comparatively enriched in pyroxene in the LUU and, especially, in the UUU.

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Platinum mineralization in the Kapalagulu Intrusion ...

2015-9-3  Fine-grained disseminated sulfide occupies intergranular positions between closely packed olivine crystals and is often associated with, or included within, chromite crystals. An example of a narrow interval of PGE mineralization associated with chromite-sulfide harzburgite containing chromitite bands is the intersection between 169 and 170 m ...

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(PDF) Hydrothermal Chromitites from the Oman Ophiolite ...

(g) Chromite frequently composed of the smooth core and the margin complicatedly mixed with grossular. (h) Chromite grains with complex textures. (i) Skeletal chromite grains associated with chlorite.

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Platinum-Nickel-Chromium Deposits ScienceDirect

Nickel and chromite production is closely commensurate to the annual production of crude steel for ferronickel, ferrochrome, and corrosion-resistant nickel and chrome plating/polishing. Chapter ends with a comparative statement of all-inclusive primary characteristic features of global PGEs–Ni–Cr deposits covering six continents.

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(PDF) Review of Brazilian Chromite Deposits Associated ...

The composition of chromite in massive chromitite of the Ipueira-Medrado sill is compared with other deposits in Table 1. The Mg ratio of chromite from the Ipueira-Medrado sill extends over a wide range (0.45-0.72), while the Cr ratios (0.58 -0.68) vary through a smaller range.

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Review of Brazilian Chromite Deposits Associated with ...

2020-3-26  Review of Brazilian Chromite Deposits Associated with Layered Complexes: Constraints for the Postulated Genetic Models Cesar F. Ferreira Filho 1, Juliana C. Marques , Carlos A. Spier2, Sylvia M. Araújo1 and Filipe S. M. Porto1 1Instituto de Geociências, Universidade de Brasília, Brasília, DF, 70910-900. 2Minerações Brasileiras Reunidas, Av. de

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Ferritchromite and chromian-chlorite formation in

2021-9-28  chlorite closely associated with ferritchromite (Christofides et al. 1994). Most studies indicate that ferritchromite is produced as a consequence of a metamorphic overprint (e.g., Evans and Frost 1975; Barnes 2000). Chromite alteration is influenced by the degree of metamor-phism and, as reported by Barnes (2000), chromite in greenschist

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Platinum mineralization in the Kapalagulu Intrusion ...

2015-9-3  Fine-grained disseminated sulfide occupies intergranular positions between closely packed olivine crystals and is often associated with, or included within, chromite crystals. An example of a narrow interval of PGE mineralization associated with chromite-sulfide harzburgite containing chromitite bands is the intersection between 169 and 170 m ...

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iOL 56, JANUARY FEBRUARY, 1971

2007-4-3  chromite is interpreted to have formed from shock-melting of a chromite-ilmenite intergrowth followed by suliiciently rapid cooling to prevent exsolution of a titanium-rich phase. Unshocked chromite in Cachari is similar in composition to chromite from other monomict pigeonite-plagioclase achondrites and is closely associated with ilmenite.

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Chromite–silicate chemistry of the Neoarchean

Chromite-layered anorthosite complexes occur in the Proterozoic Eastern Ghats belt of Peninsular ... layered complexes are systematically closely associated with supracrustal rocks in strongly ...

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CHROMITE DEPOSITS OF PAKISTAN: A SHORT REVIEW

2020-8-10  chromite mineral has economic significance in nichrome, paint industry, stainless steel, and refractory lining. Chromite which is a source of chromium is hosted in mafic and ultramafic rocks like harzburgite, pyroxenite, and dunite associated with ophiolites and their derivatives as part of

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(PDF) Platinum-group minerals and tetraauricupride in ...

The second (late) generation is closely associated with Au-rich, PGE-poor magnetite ores which host a complex assemblage of inclusions consisting mainly of graphite, Cu-Fe- and pure Cu sulphides ...

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Platinum-Nickel-Chromium Deposits ScienceDirect

Nickel and chromite production is closely commensurate to the annual production of crude steel for ferronickel, ferrochrome, and corrosion-resistant nickel and chrome plating/polishing. Chapter ends with a comparative statement of all-inclusive primary characteristic features of global PGEs–Ni–Cr deposits covering six continents.

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Platinum-group minerals and Fe–Ni minerals in the

2019-9-1  The double-rimmed altered chromite distributed in the semi-massive chromitites, coexisting with the most abundant PGM and Fe–Ni minerals, is the dominant type of chromite in the Sartohay podiform chromitite. From core to rim, chromite first converted into the porous inner rim, followed by the dense chromite outer rim (Fig. 3d).

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E I ectron-microprobe study of chromitites associated

2010-11-9  In field studies of chromite deposits in Cuoa* Thayer (1943) pointed out that in several provinces the chromite deposits were in peridotites closely associated with gabbroic rocks. Thayer (1963) later observed that all podiform chromite deposits occur with either dunite or

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Ferritchromite and chromian-chlorite formation in

2021-9-28  chlorite closely associated with ferritchromite (Christofides et al. 1994). Most studies indicate that ferritchromite is produced as a consequence of a metamorphic overprint (e.g., Evans and Frost 1975; Barnes 2000). Chromite alteration is influenced by the degree of metamor-phism and, as reported by Barnes (2000), chromite in greenschist

Read More
iOL 56, JANUARY FEBRUARY, 1971

2007-4-3  chromite is interpreted to have formed from shock-melting of a chromite-ilmenite intergrowth followed by suliiciently rapid cooling to prevent exsolution of a titanium-rich phase. Unshocked chromite in Cachari is similar in composition to chromite from other monomict pigeonite-plagioclase achondrites and is closely associated with ilmenite.

Read More
Chromite–silicate chemistry of the Neoarchean

Chromite-layered anorthosite complexes occur in the Proterozoic Eastern Ghats belt of Peninsular ... layered complexes are systematically closely associated with supracrustal rocks in strongly ...

Read More
CHROMITE DEPOSITS OF PAKISTAN: A SHORT REVIEW

2020-8-10  chromite mineral has economic significance in nichrome, paint industry, stainless steel, and refractory lining. Chromite which is a source of chromium is hosted in mafic and ultramafic rocks like harzburgite, pyroxenite, and dunite associated with ophiolites and their derivatives as part of

Read More
HIGH-PRESSURE PHASES OF CHROMITE IN L6

2009-12-8  high-pressure polymorphs of chromite (hp-chromite) with an orthorhombic CaFe 2O 4- and a CaTi 2O 4-structure (named Xieite [6]) were found closely associ-ated with shock melt in the L6-chondrite Suizhou [4] and in the martian meteorite Chassigny [7]. Associated mineral assemblages and experimental data suggest

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CHAPTER 9

2021-2-5  Chromite(ideally FeCr204,although always containingsignifi­ ... and are associated with base metal sulfides ofiron, nickel, and copper(pyr­ ... closely related to the problem ofthe origin ofthe ultramafic rocks ofAlpine type,whichform partofso-calledophiolitecomplexes.Currenttheories relate

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Platinum-Nickel-Chromium Deposits ScienceDirect

Nickel and chromite production is closely commensurate to the annual production of crude steel for ferronickel, ferrochrome, and corrosion-resistant nickel and chrome plating/polishing. Chapter ends with a comparative statement of all-inclusive primary characteristic features of global PGEs–Ni–Cr deposits covering six continents.

Read More
Platinum-group minerals and Fe–Ni minerals in the

2019-9-1  The double-rimmed altered chromite distributed in the semi-massive chromitites, coexisting with the most abundant PGM and Fe–Ni minerals, is the dominant type of chromite in the Sartohay podiform chromitite. From core to rim, chromite first converted into the porous inner rim, followed by the dense chromite outer rim (Fig. 3d).

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Chemistry, Morphology and Origin of Magmatic-Reaction ...

A chromite stringer invariably occurs at the base of the Bastard Reef (Wagner, 1929; Vermaak, 1976). Categorization of chromite stringers is subjective. Stringers associated with the Pseudoreef unit, for example, may be grouped as either Type IIb or Type III, as

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