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compositions and tectonic settings of chromite deposits

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Compositions and tectonic settings of chromite deposits ...

Orogenic belts with tectonic features similar to those of Mesozoic and Tertiary age suggest plate tectonic processes, but oceanic crust might have been thicker and difficult to obduct at this time.4. After 800 Ma, ophiolite-hosted podiform chromite deposits predominate, indicating plate tectonic systems similar to those of present times.

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Compositions and tectonic settings of chromite deposits ...

Compositions and tectonic settings of chromite deposits through time; reply C. W. Stowe University of Cape Town, Department of Geological Sciences, Rondebosch, South Africa

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Compositions of chromite, associated minerals, and ...

It is clear that high-Cr and high-Al chromitites may occur in the same ophiolite and sometimes in the same ophiolite block (e.g., Zhou et al. 2000) and there does not appear to be a simple relationship between chromite composition and tectonic environment. 6.5. A proposed model for the generation of podiform chromite deposits

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Chromite - an overview ScienceDirect Topics

Chromite deposits are broadly classified in early 1970’s as “Stratiform” and “Podiform” according to modes of occurrence, forms, and textures. Stowe (1994) further classified Chromite deposits as “Bushveld-type” and “Ophiolitic-type” complexes based on compositions and tectonic settings. The largest deposits of Chromite ...

Composition and tectonic settings of chromite deposits ...

Composition and tectonic settings of chromite deposits through time; discussion Hugh Rollinson Cheltenham and Gloucester College of HE, Department of

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Petrogenetic Evolution of Chromite Deposits in the Archean ...

This is largely because the chemical composition of chromite is controlled by mantle-melting processes that are typical of a particular tectonic setting (e.g., Dick and Bullen, 1984; Barnes and Roeder, 2001; Kamenetsky et al., 2001 and references therein). Therefore, the study of chromite deposits in Archean greenstone belts can help to reveal ...

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Tectonic Settings of Metal Deposits - Geology In

A variety of local tectonic settings exist along collision plate margins. Most of the deposits that occur here have formed in diverse tectonic settings and have been transported to the collision zones. Consequently, a variety of metallic deposits are abundant here:

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 ...

Compositions of chromite, associated minerals, and ...

Compositions of chromite, associated minerals, and parental magmas of podiform chromite deposits: The role of slab contamination of asthenospheric melts in suprasubduction zone envrionments

Compositions of chromite, associated minerals, and ...

Compositions of chromite, associated minerals, and parental magmas of podiform chromite deposits: The role of slab contamination of asthenospheric melts in suprasubduction zone envrionments

Genesis and tectonic setting of high-Cr podiform ...

The relatively high resistance of chromite to weathering and alteration makes it a scientifically important mineral which can be used as petrogenetic indicator for the deduction of parental melt composition and degree of mantle partial melting under different tectonic conditions (Irvine, 1965, Dick and Bullen, 1984, Arai, 1992, Barnes and ...

Compositional variations in the Mesoarchean chromites of ...

Mar 20, 2010  The chromite deposits in the Archean Nuggihalli schist belt are part of a layered ultramafic–mafic sequence within the Western Dharwar Craton of the Indian shield. The 3.1-Ga ultramafic–mafic units occur as sill-like intrusions within the volcano-sedimentary sequences of the Nuggihalli greenstone belt that are surrounded by the tonalite–trondhjemite–granodiorite (TTG) suite

Compositions of chromite, associated minerals, and ...

Jul 01, 2014  Read "Compositions of chromite, associated minerals, and parental magmas of podiform chromite deposits: The role of slab contamination of asthenospheric melts in suprasubduction zone environments, Gondwana Research" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

Geological and Tectonic Setting of Cu-Au Deposits in ...

Geological and Tectonic Setting of Cu-Au Deposits in Northern Lao PDR Takayuki Manaka*, Khin Zaw and Sebastien Meffre CODES ARC Centre of Excellence in Ore Deposits, University of

Special Issue of the ‘Ore Geology Reviews’ on Chromite ...

According to form and texture chromite deposits have been broadly classified as 'Stratiform' and 'Podiform' types (Thayer, 1973), whereas based on tectonic settings chromite deposits are ...

Magnesiochromite: Mineral information, data and localities.

Stowe, C.W. (1994): Compositions and tectonic settings of chromite deposits through time. Economic Geology 89, 528-546. Internet Links for Magnesiochromite Hide

The Mineralogy and Chemistry of the Chromite Deposits of ...

The tectonic setting of the Turkish ophiolite belt is a direct result of the ... the chemical compositions of chromite display variable degrees of the partial melting of host peridotites (Zhou and Robinson, ... General geological setting and character of chromite deposits in Turkey, Petrascheck, W., Karamata, S., Kravchenko, G. G., ...

Chromite Mineral Data

General Chromite Information : Chemical Formula: Fe++Cr2O4 : Composition: Molecular Weight = 223.84 gm Chromium 46.46 % Cr 67.90 % Cr 2 O 3: Iron 24.95 % Fe 32.10 % FeO: Oxygen 28.59 % O: 100.00 % 100.00 % = TOTAL OXIDE

INTRUSION-RELATED DEPOSITS

Granite-related mineral deposits (Cu, Mo (Molybdenum), Sn (Tin), W (Tungsten), U (uranium), F Fluorine), rare metals, etc.) occur as ore bodies with one or more metals. The composition mainly reflects the chemical composition and less so the tectonic setting of the associated igneous rocks. 1. Granophile Metal Deposits (e.g., Sn, W, F, Mo, U ...

(PDF) The Exotic Composition of Chromitites from the Loma ...

Chromite composition for major (A,B), minor and trace e lements (C,D). Cr-rich a nd Al- rich fields from Zhou et al. (2014); podiform, stratiform and crustal chromitite fields from Lian et al ...

Podiform Chromite Deposits--Database and Grade and Tonnage ...

Aug 15, 2012  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, off-ridge, and suprasubduction tectonic settings.

Genesis of chromite deposits by dynamic upgrading of Fe ...

A fundamental problem in the genesis of all stratiform chromite deposits is how layers of massive to semi-massive chromite that are commonly up to 1 m thick (e.g., Bushveld [South Africa], Stillwater [Montana, USA]), less commonly up to 10 m thick (e.g., Inyala and Railway Block [Zimbabwe], Ipueira-Medrado [Brazil], Uitkomst [South Africa], Sukinda [India]), but in some cases up to 100 m thick ...

(PDF) Compositional variations in the Mesoarchean ...

Chrome spinel, known as chromite, is a unique mineral that can be generally used to reflect particular tectonic settings since its chemical composition is mainly controlled by mantle melting ...

(PDF) The Exotic Composition of Chromitites from the Loma ...

Chromite composition for major (A,B), minor and trace e lements (C,D). Cr-rich a nd Al- rich fields from Zhou et al. (2014); podiform, stratiform and crustal chromitite fields from Lian et al ...

Podiform Chromite Deposits--Database and Grade and Tonnage ...

Aug 15, 2012  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, off-ridge, and suprasubduction tectonic settings.

Genesis of chromite deposits by dynamic upgrading of Fe ...

A fundamental problem in the genesis of all stratiform chromite deposits is how layers of massive to semi-massive chromite that are commonly up to 1 m thick (e.g., Bushveld [South Africa], Stillwater [Montana, USA]), less commonly up to 10 m thick (e.g., Inyala and Railway Block [Zimbabwe], Ipueira-Medrado [Brazil], Uitkomst [South Africa], Sukinda [India]), but in some cases up to 100 m thick ...

(PDF) Compositional variations in the Mesoarchean ...

Chrome spinel, known as chromite, is a unique mineral that can be generally used to reflect particular tectonic settings since its chemical composition is mainly controlled by mantle melting ...

Podiform chromite deposits - USGS

Subtype of podiform chromite deposit as determined by the grade and tonnage models. Textual values of no more than 15 characters. tectset Paleotectonic setting. Paleotectonic setting, a preliminary categorization of the deposit according to the tectonic setting in which the deposit formed, midocean ridge, off-ridge, or suprasubduction.

Platinum-Group Minerals and Other Accessory Phases in ...

chromite deposits, redrawn after [10]. 3. Previous Work and Descripti on of the Chromite Deposits From the end of the 19th century until 1929 about 80 small Al-rich chromite deposits were discovered and mined in the Alapaevsk massif. This activity yielded more than 70 thousand tons of ore.

Podiform chromite deposits--database and grade and tonnage ...

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, off-ridge, and suprasubduction ...

Bushveld Igneous Complex - Wikipedia

The Bushveld Igneous Complex (BIC) is the largest layered igneous intrusion within the Earth's crust. It has been tilted and eroded forming the outcrops around what appears to be the edge of a great geological basin: the Transvaal Basin.It is approximately 2 billion years old and is divided into four different limbs: the northern, southern, eastern, and western limbs.

Chromite deposits of the Tiebaghi ultramafic massif, New ...

The mineral compositions also show evolution, by a decrease of the Mg/Fe and Ni content of silicates and the Cr/Al of chrome spinel, and by an increase of the Al, Ti, and Na contents of pyroxenes, with conspicuous geochemical cyclic units.The chromite deposits appear at three levels of the host series: as schlieren in thick dunitic layers near ...

Chromite and PGE deposits of mesoarchaean ultramafic-mafic ...

May 21, 2009  Stowe, C.W. (1994) Compositions and tectonic settings of chromite deposits though time. Econ. Geol., v.89, pp.528–546. CrossRef Google Scholar Sutton, J. (1963) Long-term cycles in the evolution of the continents.

Classification of Mineral Deposits Geology for Investors

Jul 29, 2013  There are two main approaches to mineral deposit classification. The descriptive models are a more objective label, which describes the rocks and tectonic setting of the deposit. These have now evolved to what is known as a genetic model, which includes theories on deposit formation as well as the physical properties of the mineral deposit.

Compositional variations in the Mesoarchean chromites of ...

Mar 20, 2010  The chromite deposits in the Archean Nuggihalli schist belt are part of a layered ultramafic–mafic sequence within the Western Dharwar Craton of the Indian shield. The 3.1-Ga ultramafic–mafic units occur as sill-like intrusions within the volcano-sedimentary sequences of the Nuggihalli greenstone belt that are surrounded by the tonalite–trondhjemite–granodiorite (TTG) suite

Stratiform Chromite Deposit Model - USGS

Chromium is the primary commodity associated with stratiform chromite deposits. The economic potential of chromite deposits depends mainly on the thickness, continuity, and grade of ore. The most important uses of chromium are in stainless steels, nonferrous alloys, and chromium plating. Chemical-

The characteristics, origins, and geodynamic settings of ...

There are six distinct classes of gold deposits, each represented by metallogenic provinces, having 100's to >1000 tonne gold production. The deposit classes are: (1) orogenic gold; (2) Carlin and Carlin-like gold deposits; (3) epithermal gold-silver deposits; (4) copper-gold porphyry deposits; (5) iron-oxide copper-gold deposits; and (6) gold-rich volcanic hosted massive sulfide (VMS) to ...