Porphyry-Related Metamorphosed Au-Ag and Cu-Mo Deposits in the Precambrian of the Fennoscandian Shield
The Pellapahk Cu-Mo and Oleninskoe Au-Ag deposits in the western segment of the Russian Arctic in the Kolmozero–Voronya greenstone belt are considered two parts of an Archean (2.83–2.82 Ga) porphyry-epithermal system, probably the oldest one defined in the Fennoscandian Shield. Formation of the Olen...
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doaj-7a2e5ee6bed047bf95153457de5444ad2021-01-30T00:06:07ZengMDPI AGMinerals2075-163X2021-01-011113913910.3390/min11020139Porphyry-Related Metamorphosed Au-Ag and Cu-Mo Deposits in the Precambrian of the Fennoscandian ShieldArkadii A. Kalinin0Nikolay M. Kudryashov1Geological Institute, Kola Science Center, Russian Academy of Science, 184200 Apatity, RussiaGeological Institute, Kola Science Center, Russian Academy of Science, 184200 Apatity, RussiaThe Pellapahk Cu-Mo and Oleninskoe Au-Ag deposits in the western segment of the Russian Arctic in the Kolmozero–Voronya greenstone belt are considered two parts of an Archean (2.83–2.82 Ga) porphyry-epithermal system, probably the oldest one defined in the Fennoscandian Shield. Formation of the Oleninskoe Au-Ag deposit at the epithermal stage of the system is indicated by the spatial and genetic relationships with the sills of granite porphyry, the geochemical association of ore elements (Au, Ag, Cu, Pb, Sb, As), an Au/Ag ratio of<0.2, and the multiplicity of silver mineralization with different Ag, Cu, Pb, Sb sulfosalts. The geological–structural characteristics of the Oleninskoe and the Pellapahk, i.e., their location in a shear zone, the morphology and size of ore bodies, the scale of the deposits, and the intensity and zoning of rock alteration, do not oppose this model. Mineralized rocks of the Pellapahk Cu-Mo and Oleninskoe Au-Ag deposits were amphibolite metamorphosed in the Neoarchean and again in the Paleoproterozoic. Structures of sulfide melt crystallization formed in the ores during metamorphism, those are fine intergrowths of galena, argentotetrahedrite, pyrargyrite, pyrrhotite, ullmannite, stutzite, and other mineral phases of low-melting-point metals such as Ag, Cu, Pb, Sb, As, Bi.https://www.mdpi.com/2075-163X/11/2/139Fennoscandian ShieldKolmozero–Voronya beltOleninskoe Au-Ag depositPellapahk porphyry depositalteration, goldsilver |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Arkadii A. Kalinin Nikolay M. Kudryashov |
spellingShingle |
Arkadii A. Kalinin Nikolay M. Kudryashov Porphyry-Related Metamorphosed Au-Ag and Cu-Mo Deposits in the Precambrian of the Fennoscandian Shield Minerals Fennoscandian Shield Kolmozero–Voronya belt Oleninskoe Au-Ag deposit Pellapahk porphyry deposit alteration, gold silver |
author_facet |
Arkadii A. Kalinin Nikolay M. Kudryashov |
author_sort |
Arkadii A. Kalinin |
title |
Porphyry-Related Metamorphosed Au-Ag and Cu-Mo Deposits in the Precambrian of the Fennoscandian Shield |
title_short |
Porphyry-Related Metamorphosed Au-Ag and Cu-Mo Deposits in the Precambrian of the Fennoscandian Shield |
title_full |
Porphyry-Related Metamorphosed Au-Ag and Cu-Mo Deposits in the Precambrian of the Fennoscandian Shield |
title_fullStr |
Porphyry-Related Metamorphosed Au-Ag and Cu-Mo Deposits in the Precambrian of the Fennoscandian Shield |
title_full_unstemmed |
Porphyry-Related Metamorphosed Au-Ag and Cu-Mo Deposits in the Precambrian of the Fennoscandian Shield |
title_sort |
porphyry-related metamorphosed au-ag and cu-mo deposits in the precambrian of the fennoscandian shield |
publisher |
MDPI AG |
series |
Minerals |
issn |
2075-163X |
publishDate |
2021-01-01 |
description |
The Pellapahk Cu-Mo and Oleninskoe Au-Ag deposits in the western segment of the Russian Arctic in the Kolmozero–Voronya greenstone belt are considered two parts of an Archean (2.83–2.82 Ga) porphyry-epithermal system, probably the oldest one defined in the Fennoscandian Shield. Formation of the Oleninskoe Au-Ag deposit at the epithermal stage of the system is indicated by the spatial and genetic relationships with the sills of granite porphyry, the geochemical association of ore elements (Au, Ag, Cu, Pb, Sb, As), an Au/Ag ratio of<0.2, and the multiplicity of silver mineralization with different Ag, Cu, Pb, Sb sulfosalts. The geological–structural characteristics of the Oleninskoe and the Pellapahk, i.e., their location in a shear zone, the morphology and size of ore bodies, the scale of the deposits, and the intensity and zoning of rock alteration, do not oppose this model. Mineralized rocks of the Pellapahk Cu-Mo and Oleninskoe Au-Ag deposits were amphibolite metamorphosed in the Neoarchean and again in the Paleoproterozoic. Structures of sulfide melt crystallization formed in the ores during metamorphism, those are fine intergrowths of galena, argentotetrahedrite, pyrargyrite, pyrrhotite, ullmannite, stutzite, and other mineral phases of low-melting-point metals such as Ag, Cu, Pb, Sb, As, Bi. |
topic |
Fennoscandian Shield Kolmozero–Voronya belt Oleninskoe Au-Ag deposit Pellapahk porphyry deposit alteration, gold silver |
url |
https://www.mdpi.com/2075-163X/11/2/139 |
work_keys_str_mv |
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