METAMORPHIC VANADIUM-CHROMIUM SPINEL (Sludyanka Complex, South Baikal area). FERROAN SPINEL
L.Z. Reznitsky, E.V. Sklyarov, I.G. Barash
Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences, Irkutsk, Russia
Keywords: Chromite, Zn-V chromite, metamorphism, magmatism, Sludyanka Complex, South Baikal area
Abstract
V-Cr spinel of wide composition range is present as a rock-forming or accessory mineral in the parametamorphic rocks of the Sludyanka Complex (South Baikal area, Siberia, Russia). The spinel can be subdivided into two large groups: magnesian spinel and ferroan spinel. In this paper we describe ferroan spinel. It is subdivided into three groups: (1) Zn-V-bearing and vanadium spinel (up to 5 wt. % ZnO and up to 19.5 wt. % V2O3); (2) V-bearing zinc spinel and vanadium zincochromite (up to 6 wt. % V2O3 and 5.0-20.3 wt. % ZnO); and (3) Zn-V spinel and zincochromite (>6 wt. % V2O3 and 5.0-22.2 wt. % ZnO). A separate small group of ferroan spinel is represented by ternary chromite-coulsonite-magnetite solid solution. In addition to the Slyudyanka spinel, we present a summary of metamorphic chromium spinel and vanadium spinel from other deposits. The behavior of Cr, V, and Zn in metamorphic and magmatic spinel is discussed.
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