The Vorontsovskoe Au-Hg-As ore deposit (Northern Urals, Russia): Geological setting, ore mineralogy, geochemistry, geochronology and genetic model

V. V. Murzin, E. A. Naumov, O. B. Azovskova, D. A. Varlamov, M. Yu Rovnushkin, F. Pirajno

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The large Vorontsovskoe Au-Hg-As deposit in the Urals is located in the exocontact of the Early Devonian Auerbah gabbro-diorite-granodiorite massif, which intrudes volcano-sedimentary rocks. The orebodies are confined to a tectonic contact of calcareous and tuffaceous rocks. They are composed of 6 types of disseminated ores, but the main reserves of gold are associated with the following ore types: gold-pyrite-arsenopyrite in altered tuffaceous rocks, pyrite-realgar ores in limestone breccia with a carbonate-volcanogenic cement, and gold-oxide-clay from regolith with residual gold. Early ore associations have been formed at 450–300 °C, whereas the late ores have been formed at lower temperature of 260–110 °C. We propose a model for the genesis of the Vorontsovskoe deposit based on synchronicity of mineralization with the formation of the Auerbah volcano-plutonic complex. The Ar-Ar age of hydromica from the gold-arsenopyrite association is 391.1 ± 4.9 Ma, which coincides with the age of igneous rocks of the Auerbah complex. The main sources of water and carbon dioxide were composed of the fluid derived from the magma chamber and the metamorphic water equilibrated with carbonate sedimentary rocks. Magmatic fluid dominated during the development of skarns, jasperoids and quartz veins, whereas metamorphic water was dominant during quartz-sericite alteration of volcano-sedimentary rocks and calcareous breccias. The bulk of the sulfur was supplied by a deep magma reservoir, however this source prevailed only during skarn ore formation. The mixing between deep-sourced sulfur and sedimentary or biogenic sulfur was established for other ore types. Gold and other ore components were possibly introduced during the volcanic and intrusive activity and also extracted from host sedimentary rocks.

Original languageEnglish
Pages (from-to)271-298
Number of pages28
JournalOre Geology Reviews
Volume85
DOIs
Publication statusPublished - 1 May 2017

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Geochronology
Ore deposits
Geochemistry
Mineralogy
geochronology
ore deposit
Ores
mineralogy
geochemistry
Gold
Sedimentary rocks
gold
Volcanoes
sedimentary rock
Sulfur
Quartz
volcano
arsenopyrite
Carbonates
sulfur

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Murzin, V. V. ; Naumov, E. A. ; Azovskova, O. B. ; Varlamov, D. A. ; Rovnushkin, M. Yu ; Pirajno, F. / The Vorontsovskoe Au-Hg-As ore deposit (Northern Urals, Russia) : Geological setting, ore mineralogy, geochemistry, geochronology and genetic model. In: Ore Geology Reviews. 2017 ; Vol. 85. pp. 271-298.
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abstract = "The large Vorontsovskoe Au-Hg-As deposit in the Urals is located in the exocontact of the Early Devonian Auerbah gabbro-diorite-granodiorite massif, which intrudes volcano-sedimentary rocks. The orebodies are confined to a tectonic contact of calcareous and tuffaceous rocks. They are composed of 6 types of disseminated ores, but the main reserves of gold are associated with the following ore types: gold-pyrite-arsenopyrite in altered tuffaceous rocks, pyrite-realgar ores in limestone breccia with a carbonate-volcanogenic cement, and gold-oxide-clay from regolith with residual gold. Early ore associations have been formed at 450–300 °C, whereas the late ores have been formed at lower temperature of 260–110 °C. We propose a model for the genesis of the Vorontsovskoe deposit based on synchronicity of mineralization with the formation of the Auerbah volcano-plutonic complex. The Ar-Ar age of hydromica from the gold-arsenopyrite association is 391.1 ± 4.9 Ma, which coincides with the age of igneous rocks of the Auerbah complex. The main sources of water and carbon dioxide were composed of the fluid derived from the magma chamber and the metamorphic water equilibrated with carbonate sedimentary rocks. Magmatic fluid dominated during the development of skarns, jasperoids and quartz veins, whereas metamorphic water was dominant during quartz-sericite alteration of volcano-sedimentary rocks and calcareous breccias. The bulk of the sulfur was supplied by a deep magma reservoir, however this source prevailed only during skarn ore formation. The mixing between deep-sourced sulfur and sedimentary or biogenic sulfur was established for other ore types. Gold and other ore components were possibly introduced during the volcanic and intrusive activity and also extracted from host sedimentary rocks.",
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The Vorontsovskoe Au-Hg-As ore deposit (Northern Urals, Russia) : Geological setting, ore mineralogy, geochemistry, geochronology and genetic model. / Murzin, V. V.; Naumov, E. A.; Azovskova, O. B.; Varlamov, D. A.; Rovnushkin, M. Yu; Pirajno, F.

In: Ore Geology Reviews, Vol. 85, 01.05.2017, p. 271-298.

Research output: Contribution to journalArticle

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