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Fe-Ti Oxide Assemblages from the Contact-Metamorphosed Mafic-Ultramafic Rocks of the Sedova Zaimka Intrusion (Western Siberia, Russia): The Tracking of Metamorphic Transformations

1
VS Sobolev Institute of Geology and Mineralogy, Siberian Branch of Russian Academy of Sciences, 3 Koptyuga Avenue, 630090 Novosibirsk, Russia
2
Novosibirsk State University, 2 Pirogova str., 630090 Novosibirsk, Russia
*
Author to whom correspondence should be addressed.
Minerals 2020, 10(3), 253; https://doi.org/10.3390/min10030253
Received: 28 January 2020 / Revised: 29 February 2020 / Accepted: 8 March 2020 / Published: 10 March 2020
(This article belongs to the Section Mineral Geochemistry and Geochronology)
Studies that track and compiled transformations of ilmenite and magnetite under conditions of different metamorphic grades are still very limited. The Sedova Zaimka intrusion in Western Siberia (Russia) is a good example to examine the effect of contact metamorphism from greenschist to low-amphibolite facies on magmatic Fe-Ti oxide minerals, as this small mafic-ultramafic body is located within contact metamorphic aureole of a large granite pluton. In the Sedova Zaimka, ilmenite with little to no magnetite is present as an accessory dissemination throughout metamorphosed rocks. Ilmenite is variably enriched in MnO (1 to 13.3 wt%) and depleted in MgO (less than 0.3 wt%), suggesting that its primary magmatic composition has been unevenly modified by diffusion re-equilibrium with coexisting metamorphic silicates. The elevated content of ZnO (up to 0.5 wt%) and NiO (up to 0.4 wt%) in ilmenite suggests that both ZnO and NiO, like MnO, must be strongly partitioned into ilmenite relatively to silicate minerals under the reducing contact metamorphic conditions, if chromite is absent. The textural observations of ilmenite–sulfide and ilmenite–titanite–sulfide relationships indicate that Ti-magnetite, in contrast to ilmenite, is an unstable phase in the presence of sulfur-rich reduced metamorphic fluids and is completely replaced by sulfides, with the development of specific “octahedral meshes” of ilmenite in sulfides. View Full-Text
Keywords: ilmenite; magnetite; titanite; metagabbro; contact metamorphism; Sedova Zaimka; Tom’–Kolyvan zone; Russia ilmenite; magnetite; titanite; metagabbro; contact metamorphism; Sedova Zaimka; Tom’–Kolyvan zone; Russia
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Svetlitskaya, T.V.; Nevolko, P.A.; Fominykh, P.A. Fe-Ti Oxide Assemblages from the Contact-Metamorphosed Mafic-Ultramafic Rocks of the Sedova Zaimka Intrusion (Western Siberia, Russia): The Tracking of Metamorphic Transformations. Minerals 2020, 10, 253.

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