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Showing 1 to 4 of 4 for “"chrome spinel"”.
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The discovery of baddeleyite (ZrO2) and chrome spinel in the basal Rooiberg Group of the 2.057 Ga Bushveld Complex, South Africa: Implications for the impact and igneous scenarios for the petrogenesis of the Rooiberg Group.
The ~75 wt % SiO2 Basal Rhyolite is one of seven chemically distinct units of the Dullstroom Formation, the oldest of four formations that comprise the 4-6 km thick siliceous Rooiberg Group of the 2.057 Ga Bushveld Complex, South Africa. The discovery of composite zircon-baddeleyite grains and …
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Mineralogy and provenance of the TiO₂ - ilmenite heavy mineral sand deposit of Nataka
… Chromium impurities occur as discrete grains of chrome spinel. The compositional variety of magnetite, Cr-spinel, tourmaline, zircon and rutile indicate major contribution from granitoid terranes, subjected to granulite metamorphic facies (750 to 1000 :C), and minor contribution from mafic …
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The primary structures and fabrics of the upper mantle and lower oceanic crust from ophiolite complexes
… the foliations being defined by the alignment of chrome-spinel and orthopyroxene grains. The foliations cross-cut all the mantle petrological features except for a few late-stage dykes, and in some areas extend into the lowermost crustal cumulates. Lineations are sometimes measurable on the …
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The geochemistry and petrology of the Rodrigues Ridge (Western Indian Ocean)
… olivine and plagioclase phyric with traces of chrome spinel. Only the most western site contained any phenocryst clinopyroxene. Phenocryst olivine was in the range Fo88-79 and plagioclase was in the range An79-60. Where present the clinopyroxene was titaniferous (2.0-3.7% TiO2) in the range …