METAMORPHIC VANADIUM-CHROMIUM SPINEL (Sludyanka Complex, South Baikal area). FERROAN SPINEL
L.Z. Reznitsky, E.V. Sklyarov, I.G. Barash
a:2:{s:4:"TEXT";s:99:"Institute of the Earth’s Crust, Siberian Branch of the Russian Academy of Sciences, Irkutsk, Russia";s:4:"TYPE";s:4:"text";}
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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