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И. А. Бакшеев

Lomonosov Moscow State University

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V. O. Yapaskurt

Moscow State University

E. V. Nagornaya

V.I. Vernadsky Institute of Geochemistry and Analytical Chemistry

Yu. N. Nikolaev

Lomonosov Moscow State University

V. Yu. Prokof’ev

Institute of Geology of Ore Deposits Petrography Mineralogy and Geochemistry

A. F. Chitalin

Lomonosov Moscow State University

V. Yu. Prokofiev

Institute of Geology of Ore Deposits Petrography Mineralogy and Geochemistry

L. I. Marushchenko

Lomonosov Moscow State University

М. Ф. Вигасина

Lomonosov Moscow State University

V. I. Ustinov

Russian Academy of Sciences

I. A. Bryzgalov

Lomonosov Moscow State University

Cooperative Institutions

Lomonosov Moscow State University

Russian Academy of Sciences

Moscow State University

Institute of Geology of Ore Deposits Petrography Mineralogy and Geochemistry

Zavaritsky Institute of Geology and Geochemistry

Institute of Experimental Mineralogy

Geological Institute

Ural State Mining University

V.I. Vernadsky Institute of Geochemistry and Analytical Chemistry

University of Vienna

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Iron-bearing to iron-rich tourmalines from granitic pegmatites of the Murzinka pluton, Central Urals, Russia

Mineralogical Magazine (2022)

T. A. Gvozdenko И. А. Бакшеев Д. А. Ханин M. V. Voronin М. V. Chervyakovskaya

Abstract Black tourmalines from seven granitic pegmatites (Golodnaya, Kazennitsa, Mokrusha, Kopi Mora, Zheltyye Yamy, Buzheninov Bor and Ministerskaya) related to the Murzinka pluton, Central Urals, Russia have been investigated using electron microprobe analysis, LA-ICP-MS, Raman and Mössbauer spectroscopy. Pegmatites are hosted by serpentinites and gneisses and are classified as schorl, oxy-schorl, fluor-schorl, dravite, oxy-dravite, foitite, oxy-foitite and darrellhenryite. The possible compositional evolution of tourmalines from the Ural pegmatites is as follows: Mg-rich dravite through to Fe-rich schorl, foitite and oxy-foitite to Fe- and Mn-rich darrellhenryite. The major substitutions in the tourmalines are: (1) Fe 2+ ↔ Mg; (2) Al + W O 2– ↔ Fe 2+ + W OH – ; (3) X-site vacancy + Al ↔ Na + Fe 2+ ; (4) Al + W O 2– ↔ Mg + W OH – ; (5) X-site vacancy + Al ↔ Na + Mg; and (6) Fe ↔ Mn. Statical processing of the trace- and major-element composition distinguished three tourmaline groups: (1) trace Co, Ni, Pb, and major Ca and Mg; (2) uni-, di- and trivalent traces (Li, Zn, Ga) and di- and trivalent majors (Al, Mn); (3) U, Th, Hf, Ta, Nb, Y, In, and Sn which correspond to tri-, tetra-, and pentavalent high-field-strength elements. Mössbauer data shows the Fe 3+ /Fe 2+ ratios in tourmalines from pegmatites hosted by gneisses (0.05–0.18) and serpentinites (0.28–0.65), indicates different oxidising environments. Raman data are consistent with the composition of the tourmalines.

Pegmatite

Tourmaline

10.1180/mgm.2022.104

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Citations (4)

Compositional evolution of the tetrahedrite solid solution in porphyry-epithermal system: A case study of the Baimka Cu-Mo-Au trend, Chukchi Peninsula, Russia

Ore Geology Reviews (2017)

L. I. Marushchenko И. А. Бакшеев E. V. Nagornaya A. F. Chitalin Yu. N. Nikolaev

Tetrahedrite

Bornite

Argillic alteration

10.1016/j.oregeorev.2017.01.018

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Citations (22)

New data for distinguishing between hydrothermal synthetic, flux synthetic and natural corundum

Journal of gemmology/The journal of gemmology (2010)

Alexei S. Bidny Olga S. Dolgova И. А. Бакшеев I. A. Ekimenkova

Corundum

10.15506/jog.2010.32.1-4.7

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Citations (3)

Chemical composition of phlogopite, tourmaline and illite from hydrothermal alterations of the Nistru deposit, Baia Mare, Romania

Carpathian Journal of Earth and Environmental Sciences (2016)

И. А. Бакшеев Floarea Damian Gheorghe Damian V. Yu. Prokofiev I. A. Bryzgalov

Tourmaline

Illite

Phlogopite

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Tourmaline Composition of the Kışladağ Porphyry Au Deposit, Western Turkey: Implication of Epithermal Overprint

Minerals (2020)

Ömer Bozkaya И. А. Бакшеев Nurullah Hanilçi Gülcan Bozkaya V. Yu. Prokofiev

The Kışladağ porphyry Au deposit occurs in a middle Miocene magmatic complex comprising three different intrusions and magmatic-hydrothermal brecciation related to the multiphase effects of the different intrusions. Tourmaline occurrences are common throughout the deposit, mostly as an outer alteration rim around the veins with lesser amounts disseminated in the intrusions, and are associated with every phase of mineralization. Tourmaline mineralization has developed as a tourmaline-rich matrix in brecciated zones and tourmaline-quartz and/or tourmaline-sulfide veinlets within the different intrusive rocks. Tourmaline was identified in the tourmaline-bearing breccia zone (TBZ) and intrusive rocks that had undergone potassic, phyllic, and advanced argillic alteration. The tourmaline is present as two morphological varieties, aggregates of fine crystals (rosettes, fan-shaped) and larger isolated crystals and their aggregates. Four tourmaline generations (tourmaline I to IV) have different compositions and substitutions. Tourmaline I in TBZ and INT#1 is distinguished by the highest Fetot and enriched in Fe3+. Tourmalines II and III occur as fine aggregates, accompanied by the formation of isolated crystals and are characterized by lower Fetot and Fe3+. Tourmaline IV is characterized by the lowest Fetot, enriched in Cl, and has the highest proportion of X-site vacancy among all the tourmalines. Tourmaline I may be attributed to the potassic stage in INT#1 and early tourmaline in TBZ. Tourmalines II and III from INT#1 and the TBZ could be referred to the phyllic stage. The low Fe content in tourmaline is caused by the simultaneous deposition of sulfide minerals. Tourmaline IV from the TBZ and tourmaline II from INT#3 are distinguished by the high X-site vacancy proportion up to the formation of X-site vacant species as well as enriched in Cl; they can be attributed to the argillic stage of the hydrothermal process. The textural and especially chemical data of the tourmaline from the Kışladağ Au deposit provide information on the physico-chemical conditions during the porphyry to epithermal transition and subsequent epithermal overprinting.

Tourmaline

Pegmatite

Breccia

10.3390/min10090789

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Citations (5)

Geochemical evolution of tourmaline in the Darasun gold district, Transbaikal region, Russia: evidence from chemical and boron isotopic compositions

Mineralium Deposita (2014)

И. А. Бакшеев V. Yu. Prokofiev Robert B. Trumbull Michael Wiedenbeck Vasilii O. Yapaskurt

Tourmaline

Breccia

Gangue

Mesothermal

10.1007/s00126-014-0526-3

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Citations (23)

Tourmaline Composition of the Kışladaĝ Au Deposit, Uşak, Turkey

Acta Geologica Sinica - English Edition (2014)

Gülcan Bozkaya Nurullah Hanilçi И. А. Бакшеев V. Yu. Prokofiev David Banks

Tourmaline

10.1111/1755-6724.12374_13

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Citations (4)

Beryl from deposits of the Ural Emerald Belt, Russia: ICP-MS-LA and infrared spectroscopy study

Moscow University Geology Bulletin (2011)

Alexei S. Bidny И. А. Бакшеев M. P. Popov M. O. Anosova

Emerald

10.3103/s0145875211020037

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Citations (12)

Formation Conditions of Tourmaline Mineralization in the Berezovskoe Gold Ore Deposit, Central Urals, Russia: Evidence from Mineralogical and Isotopic Geochemical Data

Geochemistry International (2002)

И. А. Бакшеев B. V. Belyatsky V. I. Ustinov Olesya E. Kudryavtseva V. Yu. Prokof’ev

Tourmaline

Ore genesis

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Citations (3)

REE Distribution in Scheelite from the Yubileinoe Porphyry Gold Deposit, South Urals: Evidence from LA-ICP-MS Data

Geology of Ore Deposits (2018)

O. Yu. Plotinskaya И. А. Бакшеев E. A. Minervina

Scheelite

EMPA

Mineral resource classification

10.1134/s1075701518040025

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Citations (15)

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