Rock-forming feldspathoids of the sodalite–sapozhnikovite series from the Lovozero alkaline complex (Kola peninsula, Russia): isomorphism, thermal and radiation-induced transformations and genetic mineralogy
- Authors: Pekov I.V.1,2, Chukanov N.V.1,3, Shcherbakov V.D.1, Vigasina М.F.1, Shendrik R.Y.4, Sandalov F.D.1, Vyatkin S.V.1, Turchkova А.G.1
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Affiliations:
- Moscow State University
- Vernadsky Institute of Geochemistry and Analytical Chemistry RAS
- Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry RAS
- Vinogradov Institute of Geochemistry SB RAS
- Issue: Vol CLIII, No 1 (2024)
- Pages: 12-47
- Section: Articles
- URL: https://journals.rcsi.science/0869-6055/article/view/261435
- DOI: https://doi.org/10.31857/S0869605524010023
- EDN: https://elibrary.ru/gzlcrc
- ID: 261435
Cite item
Abstract
Sulfur-enriched sodalite-group feldspathoids from the Lovozero alkaline complex (Kola peninsula, Russia) and products of their laboratory, anthropogene, and natural thermal and radiation-induced transformations were studied using EMPA, single-crystal XRD, and Raman, IR, ESR and optical spectroscopy. Sodalite Na8[Al6Si6O24]Cl2 and sapozhnikovite Na8[Al6Si6O24](HS)2 form a continuous isomorphous series [with the Cl:HS ratio variation (in mol.%) from Cl100(HS)0 to Cl12(HS)88] in highly agpaitic feldspathoid syenites and their pegmatites. In Lovozero, hydrosulfide anion HS— turned out the major form of sulfidic sulfur occurrence in minerals of this group including sodalite-hackmanite. It is found that sapozhnikovite and HS-rich sodalite are important rock-forming minerals of some Lovozero rocks; a new rock, poikilitic nepheline-sapozhnikovite syenite was discovered. Sapozhnikovite and intermediate members of the sodalite–sapozhnikovite series are the sensitive geochemical indicator, an oxymeter which indicates reducing conditions of mineral formation. Under heating, HS− anion in sodalite-sapozhnikovite series minerals destroys and sulfur forms polysulfide groups: radical anion S2●− (500–600 °C) and further radical anion S3●− (700 °C and above). The S3●− groups also appear in the result of radiation-induced transformation of these minerals. Under natural radioactive irradiation at the contact with Th-enriched steenstrupine, an intermediate member of the sodalite-sapozhnikovite series transformed to an earlier unknown in nature S3●−-rich variety of sodalite with the simplified formula Na8[Al6Si6O24][Cl,(S3)].
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About the authors
I. V. Pekov
Moscow State University; Vernadsky Institute of Geochemistry and Analytical Chemistry RAS
Author for correspondence.
Email: igorpekov@mail.ru
Faculty of Geology
Russian Federation, Moscow; MoscowN. V. Chukanov
Moscow State University; Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry RAS
Email: igorpekov@mail.ru
Faculty of Geology
Russian Federation, Moscow; Chernogolovka, Moscow OblastV. D. Shcherbakov
Moscow State University
Email: igorpekov@mail.ru
Faculty of Geology
Russian Federation, MoscowМ. F. Vigasina
Moscow State University
Email: igorpekov@mail.ru
Faculty of Geology
Russian Federation, MoscowR. Yu. Shendrik
Vinogradov Institute of Geochemistry SB RAS
Email: igorpekov@mail.ru
д. чл.
Russian Federation, IrkutskF. D. Sandalov
Moscow State University
Email: igorpekov@mail.ru
Faculty of Geology
Russian Federation, MoscowS. V. Vyatkin
Moscow State University
Email: igorpekov@mail.ru
Faculty of Geology
Russian Federation, MoscowА. G. Turchkova
Moscow State University
Email: igorpekov@mail.ru
Faculty of Geology
Russian Federation, MoscowReferences
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