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200th Anniversary Meeting of the Russian Mineralogical Society
Saint Petersburg, Russia
9-12 October 2017
2017minsoc.ru
http://www.minsoc.ru/2017/
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╠etasomatic rocks after shungite-bearing rocks of the Maksovo deposit, Onega structure, Karelia

RMS-DPI code:  2017-1-256-0
Scientific session:  6. Mineral diversity and evolution of mineral formation processes.
Author listing:  Kuleshevich L.V., Filippov M.
Principal author:  Kuleshevich Lyudmila Vladimirovna
Language:  Russian
Abstract - Summary 
(short description):
Maksovites and tuff siltstones in the northwestern Maksovo deposit (Ludicovian superhorizon of the Paleoproterozoic Onega synclinorial structure, Karelia) are believed to have been subjected to alkaline-Fe-Mg alteration. They are confined to a multiple ridge-like fold and a brecciation zone. Metasomatic rocks are poorly-defined (broken unaltered rocks persist). Derived in a reducing environment, they are accompanied by an increase in Na, P, Ti and K and the formation of anthraxolite and various sulphide, sulfoarsenide and selenide (Fe-Ni-Co, base metal, Mo and Pb) streaks. Concentrations of some elements in streaky zones increase 2-100 times. ∑REE, U and Th rise less markedly (radioactivity increases but does not exceed allowable values for maksovites). Alkaline-Fe-Mg alterations are similar to those in Padma-type metasomatic rocks.
Keywords: alkaline-Fe-Mg metasomatic rocks, ore mineralization, geochemistry, maksovites, tuff siltstone, deposit Maksovo, Onega synclinorium, Karelia
 
RMS-DPI code:  2017-1-256-0
Pages:  247-249
File of proceedings 
(PDF): 
 87 K
Status:  printed
Recieved:  23/08/2017
Accepted:  16/09/2017
Published on-line:  07/12/2017
Permanent address of publication:  http://www.minsoc.ru/2017-1-256-0/
Contact author(s):  Kuleshevich, Lyudmila Vladimirovna
 

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