About the first discovery of titanium–containing hydroxylclinohumite in podiform chromitite

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Abstract

For the first time in podiform chromitites, a mineral of the humite group, titanium–containing hydroxylclinohumite, belonging to natural dense water-containing magnesian silicates (DHMS phases), was found. The find was made in chrome ores of the Paity plateau, located in the northern part of the Voikaro-Synyinsky ultramafic massif of the Polar Urals. Chromitites are deposited in the dunite body, which is located at the contact of apoharzburgite amphibole-olivine-antigorite and amphibole-enstatite-olivine metamorphic rocks containing relics of non-serpentinized harzburgites. According to optical data and chemical composition, the mineral belongs to titanium-containing hydroxylclinohumite, since it contains TiO2 (up to 5.64 wt.%), in the complete absence of fluoride. The presence of OH-grouping in the mineral is confirmed by the Raman spectrum, which generally corresponds to the standard of hydroxylclinohumite. The results of geothermometry show that this mineral was formed in chromitites of the Polar Urals at a temperature of 668–740º with and, probably, a pressure of 20–25 kbar. It follows from this that the formation (or recrystallization) of chromite ores occurred under high-pressure conditions, i. e. ore occurrences of chromites in the northern part of the Voikaro-Synyinsky massif were formed, apparently, in a suprasubduction environment.

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About the authors

P. B. Shiryaev

Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences

Author for correspondence.
Email: pavel.shiryayev@gmail.com
Russian Federation, Yekaterinburg

Yu. V. Erokhin

Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences

Email: pavel.shiryayev@gmail.com
Russian Federation, Yekaterinburg

K. S. Ivanov

Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences

Email: pavel.shiryayev@gmail.com
Russian Federation, Yekaterinburg

V. N. Puchkov

Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences

Email: pavel.shiryayev@gmail.com

Corresponding Member of the RAS

Russian Federation, Yekaterinburg

V. V. Khiller

Institute of Geology and Geochemistry of the Ural Branch of the Russian Academy of Sciences

Email: pavel.shiryayev@gmail.com
Russian Federation, Yekaterinburg

References

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Supplementary files

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2. Fig. 1. Geological scheme of the ore occurrence of the Voikaro- Synyinsky massif (Polar Urals), according to [8]. Standard designations: 1-3 – rocks of the metamorphosed dunite-harzburgite complex: 1 – with a dunite component content of 10-30%; 2 – with a dunite component content of 30-50%; 3 – with a dunite component content of more than 50%; 4 – dunites; 5 – quaternary deposits; 6 – gabbro vein; 7 – tectonic disturbances; 8 – streams; 9 – lakes; 10 – the site of the discovery of titanium-containing hydroxylclinohumite.

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3. Fig. 2. Chromitite of orbicular texture. The ore mining phenomenon of Paita, the Voykaro- Synyinsky massif, the Polar Urals. The length of the photo field is 5 cm.

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4. Fig. 3. Fusion of olivine with clinohumite in chromite; Fo – forsterite, Hchu – hydroxylclinohumite, Mchr – magnesiochromite, Clc – clinochlorite. Photo of a polished strip, without an analyzer.

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5. Fig. 4. Olivine in fusion with hydroxylclinohumite: a) – a map in the rays of titanium (light – clinohumite, black – olivine); b) – a map of the lines of clinohumite 742+783 cm‑1 on the Raman spectrum (yellow – clinohumite).

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6. Fig. 5. The correlation diagram of titanium from the sum of divalent cations in the crystal chemical formula of titanium-containing clinohumites (according to [5]). Legend: 1 – from the serpentinites of the Ki- Thai Tien Shan; 2 – from kimberlites of the USA; 3 – from marbles of the eastern Alps; 4 – from ophiolites of the western Alps; 5 – from serpentinites of Spain; 6 – from serpentinites of Italy; 7 – from UHP-metamorphites Italy. The asterisks show our data.

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7. Fig. 6. Raman Raman spectrum of hydroxylclinohumite from chromitites (the initial spectrum is shown in black , the Lorentz components are shown in green, the envelope of the Lorentz components is shown in red).

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