Sulfur isotope anomaly in magmatic sulfide mineralization of the Monchegorsk pluton as evidence of subduction processes in the Archean

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Abstract

The article presents an interpretation of data for stable isotope composition of sulfur-34 and -33 from sulfide minerals of the Early Paleoproterozoic (~2.5 Ga) Monchegorsk pluton, located in the central part of the Kola Peninsula, Russia. Available data indicate that the sulphide sulfur has both a mantle source and an atmospheric sulfur source with an isotopic anomaly. We believe that atmospheric sulfur (a product of photochemical reactions in the oxygen-free atmosphere of Archean) was transferred from the atmosphere into the deep layers of the mantle due to the processes of subduction of the oceanic crust along with sediments and their subsequent melting. The homogeneous sulfur isotopic composition of sulfur-34 and -33 for sulfide mineralization of the Monchegorsk pluton indicates fairly intense mixing of sulfur from different sources. Thus, the sulfur isotope anomaly archived in the magmatic sulfides of the Monchegorsk pluton provides an opportunity to trace the global circulation of terrestrial matter in the ancient history of the Earth.

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About the authors

Tatyana A. Velivetskaya

Far East Geological Institute, FEB RAS

Author for correspondence.
Email: velivetskaya@mail.ru
ORCID iD: 0000-0002-2833-1026

Candidate of Sciences in Geology and Mineralogy, Leading Researcher

Russian Federation, Vladivostok

Aleksandr V. Ignatiev

Far East Geological Institute, FEB RAS

Email: ignatiev@fegi.ru
ORCID iD: 0000-0002-4452-5496

Candidate of Sciences in Geology and Mineralogy, Leading Researcher

Russian Federation, Vladivostok

Sergey V. Vysotskiy

Far East Geological Institute, FEB RAS

Email: vysotskiy@fegi.ru
ORCID iD: 0000-0002-5194-5616

Doctor of Sciences in Geology and Mineralogy, Chief Researcher

Russian Federation, Vladivostok

Viktoriya V. Yakovenko

Far East Geological Institute, FEB RAS

Email: yakovenko_v.v@mail.ru
ORCID iD: 0000-0003-3834-3626

Candidate of Sciences in Geology and Mineralogy, Senior Researcher

Russian Federation, Vladivostok

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Supplementary files

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2. Fig. 1. Geological map of the Monchegorsk pluton indicating the locations of samples used in this study. 1 – gabbro-norites of the Monchetundra massif; 2 – volcanogenic-sedimentary complexes; 3–9 – formations of the Monchegorsk pluton: 3 – marginal rapidly cooled zone, 4 – norite zone, 5 – pyroxenite zone, 6 – peridotite zone, 7 – lower part of this zone, 8 – metamorphosed rocks, 9 – dunite lens with a gabbroic rim; 10 – sulfide mineralization; 11 – Archean rocks; 12 – tectonic faults; 13 – sampling locations for isotope analysis from [5]; 14 – sampling locations for isotope analysis from [12]. The figure is modified from [9, 11]

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3. Fig. 2. Values (δ34S) of sulfur isotope composition (δ34S) and sulfur isotope anomaly (∆33S) measured in samples of sulfide mineralization of the Monchegorsk pluton. For comparison, the continuous gray zone shows the range of δ34S and ∆33S values ∆33S corresponding to the mantle source of sulfur [4, 14]

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4. Fig. 3. Schematic representation of the processes of formation of igneous rocks of Monchepluton with isotopically anomalous sulfur. For explanations, see the text

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