title: Petrological model for formation of felsic volcanic rocks of the Pecherkinskaya Formation (northwestern part of the Salair Ridge)
metadata.name: dc.contributor.author
metadata.value: Vetrova, Natalia I.
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Vetrov, Evgeny V.
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Letnikova, Elena F.
metadata.lang: -
metadata.name: dc.date.accessioned
metadata.value: 2023-04-06T12:08:21Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2023-04-06T12:08:21Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2022-12
metadata.lang: -
metadata.name: dc.identifier.citation
metadata.value: Vetrova, N. I., Vetrov, E. V., Letnikova, E. F. (2022). Petrological model for formation of felsic volcanic rocks of the Pecherkinskaya Formation (northwestern part of the Salair Ridge). Vestnik of Saint Petersburg University. Earth Sciences, 67 (4), 591–613. https://doi.org/10.21638/spbu07.2022.403 (In Russian)
metadata.lang: en_GB
metadata.name: dc.identifier.other
metadata.value: https://doi.org/10.21638/spbu07.2022.403
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/39470
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: The geochemical and isotopic (Nd, Sr) characteristics of felsic volcanic rocks of the Pecherkinskaya Formation in the northwestern part of the Salair Ridge were studied. These rocks are closely associated with industrially significant deposits and manifestations of gold- and silver-bearing pyrite-polymetallic formations with potentially gold-bearing weathering crusts on them. The study of the material composition of unaltered volcanic rocks of the Pecherkinskaya Formation is necessary for the reconstruction of the conditions of their formation, which contributes to estimation of the mineragenic potential of this formation and the conditions during the accumulation of ore matter. Felsic volcanic rocks of the Pecherkinskaya Formation are an extreme member of the basalt-plagioryolite series, have an extremely high-sodium type of alkalinity with a low potassium content, are calcareous and characterized by high silica contents, low iron content, have low REE concentrations, are enriched in Pb and U and depleted in Ta and Nb, are characterized by high values of εNd (t) (+6.36) and primary ratio 87Sr / 86Sr (0.706977). The REE distribution spectra show a low degree of fractionation with a pronounced negative "europium anomaly". The geochemical composition of the Pecherkinskaya Formation volcanic rocks indicates that primary magmas were formed by partial melting of rocks of the lower continental crust at a pressure of ~ 8 kbar in equilibrium with Hbl + Cpx + Pl ± Opx restite and a temperature of ~ 750-790 ° C. The isotope-geochemical characteristics indicating the participation of depleted mantle in the source are probably inherited from the juvenile crust, the rocks of which could have been formed as a result of differentiation of mantle magmas. Geological and geochemical features of felsic volcanic rocks of the Pecherkinskaya Formation are characteristic of igneous rocks formed under conditions of oceanic arcs.
metadata.lang: en_GB
metadata.name: dc.description.sponsorship
metadata.value: The study was supported by the Russian Science Foundation, project no. 21-77-00022.
metadata.lang: en_GB
metadata.name: dc.language.iso
metadata.value: ru
metadata.lang: en_GB
metadata.name: dc.publisher
metadata.value: St Petersburg State University
metadata.lang: en_GB
metadata.name: dc.relation.ispartofseries
metadata.value: Vestnik of St Petersburg University. Earth Sciences;Volume 67; Issue 4
metadata.lang: -
metadata.name: dc.subject
metadata.value: geochemistry
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: petrogenesis
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: felsic volcanism
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: Cambrian
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: Salair
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: Pecherkinskaya Formation
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: geodynamic model
metadata.lang: en_GB
metadata.name: dc.title
metadata.value: Petrological model for formation of felsic volcanic rocks of the Pecherkinskaya Formation (northwestern part of the Salair Ridge)
metadata.lang: en_GB
metadata.name: dc.type
metadata.value: Article
metadata.lang: en_GB
resources.filename: 03.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/39470/1/03.pdf
resources.format: Adobe PDF
resources.size: 4,52 MB