Results 141 to 150 of about 191 (175)
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Advances in the understanding of chromitite deposits
Applied Earth Science, 2009Chromitites in ophiolites and layered intrusions are the primary source of high quality chromium ore. Some chromitites can also carry significant concentrations of the platinum-group elements (PGE) and in the case of the Upper Group 2 (UG2) chromitite of the Bushveld Complex (South Africa) the PGE are the primary resource.
Mondal, Sisir Kanti, McDonald, Iain
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Lithos, 2021
Abstract Podiform chromitites are unique rock units of ophiolites and ophiolitic melanges and represent invaluable repositories that reliably record the formation environment and evolution of their source and host rocks. However, there are relatively few podiform chromitites reported from Archean terranes. Here we document the major, minor, and trace
Yang Huang +8 more
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Abstract Podiform chromitites are unique rock units of ophiolites and ophiolitic melanges and represent invaluable repositories that reliably record the formation environment and evolution of their source and host rocks. However, there are relatively few podiform chromitites reported from Archean terranes. Here we document the major, minor, and trace
Yang Huang +8 more
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Origin of podiform chromitites
Journal of Asian Earth Sciences, 1997Abstract Podiform chromitite with a dunite envelope can be interpreted to be a product ofinteraction between mantle harzburgite and an exotic magma, combined with magma mixing. The secondary Si- and Cr-rich melt which is produced by the selective dissolution of orthopyroxene can be mixed with a subsequently supplied primitive melt with the mixed melt
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The Canadian Mineralogist, 2017
Abstract Chromitites found in layered intrusions and ophiolite complexes are generally enriched in platinum-group elements (PGE), especially IPGE ( i.e ., Ir, Os, Ru)-bearing platinum-group minerals (PGM), and the chromitites are usually poor in base metal sulfide (BMS) minerals.
Prichard, Hazel Margaret +4 more
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Abstract Chromitites found in layered intrusions and ophiolite complexes are generally enriched in platinum-group elements (PGE), especially IPGE ( i.e ., Ir, Os, Ru)-bearing platinum-group minerals (PGM), and the chromitites are usually poor in base metal sulfide (BMS) minerals.
Prichard, Hazel Margaret +4 more
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A shallow origin for diamonds in ophiolitic chromitites
Geology, 2018Recent findings of diamonds in ophiolitic peridotites and chromitites challenge our traditional notion of Earth mantle dynamics. Models attempting to explain these findings involve incorporation of diamonds into chromite near the mantle transition zone. However, the occurrence of metastable diamonds in this context has not been considered.
Farré-de-Pablo, Júlia +7 more
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Mineralium Deposita, 1994
Chromitite xenoliths from the Takashima alkali basalt in the Southwest Japan arc are classified into two types: Type 1 chromitite in thin layers in dunite or wehrlite xenoliths; and Type 2 chromitite in discrete xenoliths which has an orbicular texture, previously documented only from podiform chromitites in ophiolites.
S. Arai, N. Abe
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Chromitite xenoliths from the Takashima alkali basalt in the Southwest Japan arc are classified into two types: Type 1 chromitite in thin layers in dunite or wehrlite xenoliths; and Type 2 chromitite in discrete xenoliths which has an orbicular texture, previously documented only from podiform chromitites in ophiolites.
S. Arai, N. Abe
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Role of water in the origin of podiform chromitite deposits
Earth and Planetary Science Letters, 2002Abstract We report experiments in basalt oversaturated with water to duplicate the nodular ore textures of podiform chromitite ores. In immiscible basalt–water systems saturated with olivine and chromite, olivine will reside in the melt while chromite will collect in the fluid phase.
Chris Ballhaus
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Mineralogy and Petrology, 2005
A large number of podiform chromitite bodies of massive, disseminated and nodular type have been located in ultramafic units, composed of depleted mantle harzburgite and dunite of the Marmaris Peridotite from Ortaca (Mugla, SW Turkey). The chromite ore bodies are surrounded by dunite envelopes of variable thickness, exhibiting transitional boundaries ...
Uysal, I +4 more
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A large number of podiform chromitite bodies of massive, disseminated and nodular type have been located in ultramafic units, composed of depleted mantle harzburgite and dunite of the Marmaris Peridotite from Ortaca (Mugla, SW Turkey). The chromite ore bodies are surrounded by dunite envelopes of variable thickness, exhibiting transitional boundaries ...
Uysal, I +4 more
openaire +1 more source