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Ferritchromite and chromian-chlorite formation in mélange-hosted Kalkan chromitite (Southern Urals, Russia)
-
Anna Merlini
,
Giovanni Grieco
Veröffentlicht/Copyright:
1. April 2015
Abstract
Spinel is often used as a magmatic indicator of crystallization processes, without considering the effects of metamorphic alteration on spinel geochemical features. Serpentinized mélanges in the southern Urals host different kinds of disseminated to massive chromitite mineralization. In mélange environments, intense metamorphic alteration above 300 °C leads to major changes in chromite chemistry and to the growth of secondary phases such as ferritchromite and chromian-chlorite. Based on textural and chemical analyses, mélange-hosted Kalkan chromitites exhibit a hydration and oxidation reaction that can explain the formation of ferritchromite and chromian-chlorite from chromite and serpentine:
Textural analyses fit well with the proposed reaction and show that it usually proceeds very close to completion. The degree of alteration of chromite into ferritchromite is controlled by the initial chromite to serpentine ratio. In chromitites, high ratios prevent complete transformation of chromite into ferritchromite. The most likely environment for such reaction is a prograde metamorphic event post-dating serpentinization of the Kalkan ophiolite, possibly related to emplacement within an accretionary wedge.
Received: 2008-8-29
Accepted: 2009-6-9
Published Online: 2015-4-1
Published in Print: 2009-10-1
© 2015 by Walter de Gruyter Berlin/Boston
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- Tazieffite, Pb20Cd2(As,Bi)22S50Cl10, a new chloro-sulfosalt from Mutnovsky volcano, Kamchatka Peninsula, Russian Federation
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- A crystal-chemical investigation of clinozoisite synthesized along the join Ca2Al3Si3O12(OH)-Ca2Al2CrSi3O12(OH)
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- Optimizing experimental design, overcoming challenges, and gaining valuable information from the Sb K-edge XANES region
- Equation of state of γ-tricalcium phosphate, γ-Ca3(PO4)2, to lower mantle pressures
- Effect of lattice topology on the adsorption of benzyl alcohol on kaolinite surfaces: Quantum chemical calculations of geometry optimization, binding energy, and NMR chemical shielding
- The crystal structure of a naturally occurring 5C pyrrhotite from Sudbury, its chemistry, and vacancy distribution
- Finding the layer scattering origin of rectorite for basal peak calculations
- Prediction of the environmental impact of modern slags: A petrological and chemical comparative study with Roman age slags
- General model for the aqueous precipitation of rough-surface nanocrystals and application to ferrihydrite genesis
- Sursassite: Hydrogen bonding, cation order, and pumpellyite intergrowth
- Ivanyukite-Na-T, ivanyukite-Na-C, ivanyukite-K, and ivanyukite-Cu: New microporous titanosilicates from the Khibiny massif (Kola Peninsula, Russia) and crystal structure of ivanyukite-Na-T
- Ferritchromite and chromian-chlorite formation in mélange-hosted Kalkan chromitite (Southern Urals, Russia)
- Multistage boron metasomatism in the Alamo Complex (Central Iberian Zone, Spain): Evidence from field relations, petrography, and 40Ar/39Ar tourmaline dating
- Kushiroite, CaAlAlSiO6: A new mineral of the pyroxene group from the ALH 85085 CH chondrite, and its genetic significance in refractory inclusions
- Calcium Tschermak’s pyroxene, CaAlAlSiO6, from the Allende and Murray meteorites: EBSD and micro-Raman characterizations
- Steric hindrance and the enhanced stability of light rare-earth elements in hydrothermal fluids
- Grossmanite, CaTi3+AlSiO6, a new pyroxene from the Allende meteorite
Schlagwörter für diesen Artikel
Chromitite;
chromite;
ferritchromite;
chromian-chlorite;
alteration;
ophiolite
Artikel in diesem Heft
- Evolution of uranium and thorium minerals
- Tazieffite, Pb20Cd2(As,Bi)22S50Cl10, a new chloro-sulfosalt from Mutnovsky volcano, Kamchatka Peninsula, Russian Federation
- The crystal structure, origin, and formation of idrialite (C22H14): Inferences from the microbeam and bulk analyses
- Structural and spectroscopic characterization of a suite of fibrous amphiboles with high environmental and health relevance from Biancavilla (Sicily, Italy)
- Bulk and key surface structures of hematite, magnetite, and goethite: A density functional theory study
- A crystal-chemical investigation of clinozoisite synthesized along the join Ca2Al3Si3O12(OH)-Ca2Al2CrSi3O12(OH)
- Kumtyubeite Ca5(SiO4)2F2—A new calcium mineral of the humite group from Northern Caucasus, Kabardino-Balkaria, Russia
- Liquidus temperatures of the Skaergaard magma
- Optimizing experimental design, overcoming challenges, and gaining valuable information from the Sb K-edge XANES region
- Equation of state of γ-tricalcium phosphate, γ-Ca3(PO4)2, to lower mantle pressures
- Effect of lattice topology on the adsorption of benzyl alcohol on kaolinite surfaces: Quantum chemical calculations of geometry optimization, binding energy, and NMR chemical shielding
- The crystal structure of a naturally occurring 5C pyrrhotite from Sudbury, its chemistry, and vacancy distribution
- Finding the layer scattering origin of rectorite for basal peak calculations
- Prediction of the environmental impact of modern slags: A petrological and chemical comparative study with Roman age slags
- General model for the aqueous precipitation of rough-surface nanocrystals and application to ferrihydrite genesis
- Sursassite: Hydrogen bonding, cation order, and pumpellyite intergrowth
- Ivanyukite-Na-T, ivanyukite-Na-C, ivanyukite-K, and ivanyukite-Cu: New microporous titanosilicates from the Khibiny massif (Kola Peninsula, Russia) and crystal structure of ivanyukite-Na-T
- Ferritchromite and chromian-chlorite formation in mélange-hosted Kalkan chromitite (Southern Urals, Russia)
- Multistage boron metasomatism in the Alamo Complex (Central Iberian Zone, Spain): Evidence from field relations, petrography, and 40Ar/39Ar tourmaline dating
- Kushiroite, CaAlAlSiO6: A new mineral of the pyroxene group from the ALH 85085 CH chondrite, and its genetic significance in refractory inclusions
- Calcium Tschermak’s pyroxene, CaAlAlSiO6, from the Allende and Murray meteorites: EBSD and micro-Raman characterizations
- Steric hindrance and the enhanced stability of light rare-earth elements in hydrothermal fluids
- Grossmanite, CaTi3+AlSiO6, a new pyroxene from the Allende meteorite
