FERROHÖGBOMITE-2S2N IN THE DIATEXITES OF WESTERN SANGILEN, SOUTH-EASTERN TUVA, RUSSIA
https://doi.org/10.5800/GT-2022-13-3-0638
Abstract
In the Western Sangilen (Tuva–Mongolia microcontinent, Central Asian Orogenic Belt, Russia) rare mineral ferrohögbomite-2S2N, for the first time, was found in a deep-seated contact aureole of the early Paleozoic Bayan-Kol gabbro-monzodiorite intrusion. The rocks are diatexites of roof pendant, where metamorphics contact gabbronorite. Diatexites formed as a result of strong melting and desilication of quartz-bearing kyanite-staurolite schists (M1) during progressive thermal metamorphism (M2) near the Bayan-Kol intrusion with peak at 950 °C, 7–8 kbars. Ferrohögbomite-2S2N grains up to 50 μm in size found in ilmenite-corundum-magnetite-hercynite pseudomorphs. The later formed during progressive stage of thermal metamorphism M2 after regional staurolite M1 and are in cordierite-gedrite-plagioclase restite blocks of diatexites. Ferrohögbomite also appeared as thin (1–5 μm) rims around individual grains of hercynite, corundum and magnetite in a rock matrix. According to microtextural features ferrohögbomite grains formed during post-peak metamorphic stage after minerals of pseudomorphs. A univariant mineral reaction of ferrohögbomite-2S2N formation calculated quantitatively in Fe-Al-Ti-Zn-H2O system with program Mathematic 9.0 using electron microprobe chemical composition of minerals of pseudomorphs. The reaction is 0.96Spl+0.194Ilm+0.116Mag+0.036Crn+0.163H2O=0.163Hgb. A local equilibrium value during formation of ferrohögbomite was probably correlated with pseudomorphs size and thus do not transcend 1 mm3. Thermobarometry yields metamorphic temperature and pressure of ferrohögbomite formation as T=665 °C, P=5.8 kbar, which correspond to late retrograde stage of thermal metamorphism of diatexites. To present day in Russia, högbomite group mineral was known only on South Urals and Aldan Shield in Eastern Siberia.
Keywords
ferrohögbomite-2S2N,
corundum,
pseudomorphs,
diatexite,
thermal metamorphism,
Western Sangilen,
Thermocalc
Supporting agencies: The study was carried out as part of a state assignment of the Sobolev Institute of Geology and Mineralogy SB RAS.
About the Author
A. Yu. Selyatitskii
Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
Russian Federation
Russian Federation
3 Academician Koptyug Ave, Novosibirsk 630090, Russia
References
1. Armbruster T., 2002. Revised Nomenclature of Högbomite, Nigerite, and Taaffeite Minerals. European Journal of Mineralogy 14 (2), 389–395. https://doi.org/10.1127/0935-1221/2002/0014-0389.
2. Belov N.V., 1964. Sketches in Structural Mineralogy. 103. Högbomites – Ti-Hegsagonal Spinels. Collected Articles on Mineralogy of L’vov University 18 (4), 371–376 (in Russian).
3. Bocharnikova T.D., Pribavkin S.V., Kholodnov V.V., 2005. Högbomite from Ilmenite-magnetite Ores of Kusinskiy Massive (South Ural). Proceedings of the Russian Mineralogical Society 134 (2), 84–89 (in Russian).
4. Brown M., 1973. The Definition of Metatexis, Diatexis and Migmatite. Proceedings of the Geologists Association 84 (4), 371–382. https://doi.org/10.1016/S0016-7878(73)80021-5.
5. Carrington D., Harley S.L., 1995. Partial Melting and Phase Relations in High Grade Metapelites: An Experimental Petrogenetic Grid in the KFMASH System. Contribution in Mineralogy and Petrology 120, 270–291. https://doi.org/10.1007/BF00306508.
6. Gatehouse B.M., Grey I.E., 1982. The Crystal Structure of Högbomite-8H. American Mineralogy 67 (3–4), 373–380.
7. Grew E.S., Drugova G.M., Leskova N.V., 1989. Högbomite from the Aldan Shield, Eastern Siberia, USSR. Mineralogical Magazine 53 (371), 376–379. https://doi.org/10.1180/minmag.1989.053.371.14.
8. Harley S.L., 1998. Ultrahigh Temperature Granulite Metamorphism (1050 °C, 12 kbar) and Decompression in Garnet (Mg70)-Orthopyroxene-Sillimanite Gneisses from the Rauer Group, East Antarctica. Journal of Metamorphic Geology 16 (4), 541–562. https://doi.org/10.1111/j.1525-1314.1998.00155.x.
9. Hejny C., Gnos E., Grobety B., Armbruster T., 2002. Crystal Chemistry of the Polysome Ferrohögbomite-2N2S, a Long-Known but Newly Defined Mineral Species. European Journal of Mineralogy 14 (5), 957–967. https://doi.org/10.1127/0935-1221/2002/0014-0957.
10. Holland T.J.B., Powell R., 1998. An Internally Consistent Thermodynamic Data Set for Phases of Petrological Interest. Journal of Metamorphic Geology 16 (3), 309–343. https://doi.org/10.1111/j.1525-1314.1998.00140.x.
11. Kelsey D.E., Hand M., 2015. On Ultrahigh Temperature Crustal Metamorphism: Phase Equilibria, Trace Element Thermometry, Bulk Composition, Heat Sources, Timescales and Tectonic Settings. Geoscience Frontiers 6 (3), 311–356. https://doi.org/10.1016/j.gsf.2014.09.006.
12. Makagonov E.P., 1998. The Trilling of Perovskite Twins and the Fourlings of Hogbomite from Pits of Shishimsko-Nazyamskie Mountains of the South Urals. Vol. 8. Publishing House of the Institute of Mineralogy UB RAS, Miass, p. 49–56 (in Russian).
13. Moleva V.A., Myasnikov V.S., 1952. About Högbomite and Zincohögbomite as Its Variety. Doklady of the USSR Academy of Sciences 83 (5), 733–736 (in Russian).
14. Petersen E.U., Essene E.J., Peacor D.R., Marcotty L.A., 1989. The Occurrence of Högbomite in High-Graid Metamorphic Rocks. Contribution to Mineralogy and Petrology 101, 350–360. https://doi.org/10.1007/BF00375319.
15. Powell R., Holland T., Worley B., 1998. Calculating Phase Diagrams Involving Solid Solutions via Nonlinear Equations, with Examples Using THERMOCALC. Journal of Metamorphic Geology 16 (4), 577–588. https://doi.org/10.1111/j.1525-1314.1998.00157.x.
16. Reverdatto V.V., Likhanov I.I., Polyansky O.P., Sheplev V.S., Kolobov V.Yu., 2019. The Nature and Models of Metamorphism. Springer, 330 p. https://doi.org/10.1007/978-3-030-03029-2.
17. Schertl H.-P., Mills S.J., Maresch W.V. (Eds), 2019. A Compendium of IMA-Approved Mineral Nomenclature. Proceedings of the XXII General Meeting of the International Mineralogical Association (August 13–17, 2018, Melbourne, Australia). IMA, 353 p.
18. Selyatitskii A.Y., 2008. Rare Mineral Högbomite as Accessory Phase in Diatexites of Western Sangilen. In: Proceedings of the Fourth Youth Siberian International Conference on Earth’s Science (December 1–3, 2008). Novosibirsk, p. 241–242 (in Russian).
19. Selyatitskii A.Y., Polyansky O.P., Shelepaev R.A., 2021. A High-Pressure Thermal Aureole of the Bayan-Kol Gabbro–Monzodiorite Intrusion (Western Sangilen, Southeastern Tuva): Evidence for Lower-Crust Mafic Magma Chambers. Russian Geology and Geophysics, 62 (9), 987–1005. https://doi.org/10.2113/RGG20194157.
20. Spear F.S., Kohn M.J., Cheney J.T., 1999. P-T Paths from Anatectic Pelites. Contribution Mineralogy and Petrology 134, 17–32. https://doi.org/10.1007/s004100050466.
21. Visser D., Thijssen P.H.M., Schumacher J.C., 1992. Högbomite in Sapphirine-Bearing Rocks from the Bamble Sector, South Norway. Mineralogical Magazine 56 (384), 343–351. https://doi.org/10.1180/minmag.1992.056.384.06.
22. Whitney D.L., Evans B.W., 2010. Abbreviations for Names of Rock-Forming Minerals. American Mineralogy 95 (1), 185–187. https://doi.org/10.2138/am.2010.3371.
Review
For citations:
Selyatitskii A.Yu. FERROHÖGBOMITE-2S2N IN THE DIATEXITES OF WESTERN SANGILEN, SOUTH-EASTERN TUVA, RUSSIA. Geodynamics & Tectonophysics. 2022;13(3):0638. (In Russ.) https://doi.org/10.5800/GT-2022-13-3-0638
Views:
356
Email this article 