Book: Geochemistry of chromium in the Earth’s mantle

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Marco E. Ciriotti
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Book: Geochemistry of chromium in the Earth’s mantle

Messaggio da Marco E. Ciriotti » gio 05 set, 2019 18:12

Here one of the chapter of the book.

Referenza:
▪ Matrosova, E.A., Bobrov, A.V., Bindi, L. (2020): Geochemistry of Chromium in the Earth’s Mantle. Geochemistry of Chromium in the Earth's Mantle, Springer Geology, Ed., 128 pp. [5-36].

Abstract:
The most important chromium-bearing phases in the Earth’s upper mantle are chrome spinel, Cr-bearing pyroxene, and Knr-garnet, which are replaced with Knr-Maj garnet, MgCr2O4 with the calcium titanate-type structure, and (Mg,Fe)2SiO4 wadsleyite/ringwoodite. Ferropericlase (Mg,Fe)O and (Mg,Fe)SiO3 bridgmanite may be considered as the host phases for chromium under the lower mantle conditions. Below we review the information about the high-pressure chromium-bearing phases in the Earth's mantle. Since chromite (Fe,Mg)(Cr,Al)2O4 containing up to ~55 wt% Cr2O3 is the major ore mineral of chromium and is an accessory phase in many ultramafic rocks, the largest chromite deposits and the models of their formation are considered.
Marco E. Ciriotti

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