Ore-forming Сonditions of the Blagodat Gold Deposit in the Riphean Metamorphic Rocks of the Yenisey Ridge According to Geochemical and Isotopic Data
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https://elib.sfu-kras.ru/handle/2311/1285Автор:
Sazonov, Anatoly M.
Gertner, Igor F.
Zvyagina, Elena A.
Tishin, Platon A.
Poleva, Tatyana V.
Leontyev, Sergey I
Kolmakov, Yuri V.
Krasnova, Tatyana S.
Дата:
2009-06Аннотация:
Neodymium and strontium isotopic composition and rare earth elements (REE) distribution pattern
have been determined in whole rocks and minerals were separated from host metamorphic rocks
and disseminated sulfide ores of the Blagodat gold deposit. Isotopic data are given to construct few
isochrones that could be reflected an age of main stages of metamorphic and metasomatic alteration
in rocks varieties during a successive accumulation of gold in structural traps.
The significant temporal range in the forming of the studied rocks can be interpreted as an evidence of
multi-stage tectonic destruction accompanying with trust-folding processes, shear deformations and
development of local fracture zones that had place from the Late Riphean to Middle Paleozoic time.
According to isotopic data basic ore-forming processes were realized in the relatively narrow interval
from 690 to 750 Ma that correspond to a beginning of continental rifting on the western margin of
Siberian craton.
Chemistry and trace element distribution are closed for host and auriferous schists and mainly showed
differences in the composition initial sedimentary units. The middle negative value εNd (from -14 to
-16) and very high positive value εSr (from +570 to +725) are mostly corresponded to that of upper
continental crust matter. The role of synchronic granite intrusions in the studied area can be only
estimated due to a generation of thermal energy and crustal fluids.
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