title: Synrift deposits of the lower part of the Riphean stratotype, Southern Urals (a short lithochemical characterization)
metadata.name: dc.contributor.author
metadata.value: Maslov, Andrey V.
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Gareev, Emir Z.
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Podkovyrov, Victor N.
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Kotova, Ludmila N.
metadata.lang: -
metadata.name: dc.date.accessioned
metadata.value: 2018-05-29T12:47:09Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2018-05-29T12:47:09Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2018-03
metadata.lang: -
metadata.name: dc.identifier.citation
metadata.value: Maslov A. V., Gareev E. Z., Podkovyrov V. N., Kotova L. N. Synrift deposits of the lower part of the Riphean stratotype, Southern Urals (a short lithochemical characterization). Vestnik of Saint Petersburg University. Earth Sciences, 2018, vol. 63, issue 1, pp. 36–55.
metadata.lang: en_GB
metadata.name: dc.identifier.other
metadata.value: 10.21638/11701/spbu07.2018.103
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/10249
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: The study of the bulk chemical composition of the sandstones of the Ai Formation of the
  Burzyan Group of the Southern Urals (the stratotype of the Lower Riphean of Northern Eurasia)
  led to the conclusion that they contain products of destruction of both the crystalline
  basement rocks of the East European Platform and the sedimentary/metasedimentary rocks
  of its platform protocover. In the composition of sandstones and associated clay rocks, there
  appears to be a noticeable portion of lithogenous (repeatedly redeposited) material. Clay rocks
  of the Ai Formation do not contain the so-called “camouflaged pyroclastics”, and, consequently,
  the processes of their accumulation were not accompanied by erosion of volcanic rock or
  synchronous explosive activity. As a whole, low values of the chemical index of alteration
  (CIA) are inherent for fine-grained terrigenous formations. This makes it possible to assume
  their formation under conditions of relatively pronounced tectonic activity in catchment areas,
  possibly minimized by the effects of chemical weathering processes. A comparison of
  the bulk chemical compositions of the terrigenous rocks of the Ai Formation with the composition
  of the average Proterozoic craton sandstone, PAAS and a number of other reference
  geological objects has shown that they are characterized by fairly wide variations in the content
  of the main rock-forming oxides (significant chemical immaturity of the composition),
  which can also be regarded as a reflection of their accumulation in sufficiently active tectonic
  environments. Analysis of the bulk chemical composition of sandstones and clay rocks of the Ai Formation suggests that the sources of the clastic material were as acid magmatic rocks
  as sedimentary and/or metasedimentary rocks with an increased amount of quartz; this is
  consistent with the results of previous mineralogical-petrographic studies. The position of the
  individual data points of sandstones and clay rocks of the Ai Formation on the DF1–DF2 diagram
  (Verma and Armstrong-Altrin, 2013) does not allow us to draw a definite conclusion
  about their paleogeodynamic nature, since one part of the points is located in the field that is
  characteristic for sedimentary rocks of riftogenic environments, and the other lies in the field
  typical for collision environments. More specifically, in favor of the riftogenic/synrift nature of
  the terrigenous rocks of the Ai Formation, the distribution of the data points of their average
  compositions on the DF1—DF2 diagram is evidence.
metadata.lang: en_GB
metadata.name: dc.description.sponsorship
metadata.value: Работа с аналитическими материалами проведена В. Н. Подковыровым и Л. Н. Котовой в рамках темы НИР № 0153-2018-0011.
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 63; Issue 1
metadata.lang: -
metadata.name: dc.subject
metadata.value: Southern Urals
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: Lower Riphean
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: Ai Formation
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: sandstones
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: clay rocks
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: lithochemistry
metadata.lang: en_GB
metadata.name: dc.title
metadata.value: Synrift deposits of the lower part of the Riphean stratotype, Southern Urals (a short lithochemical characterization)
metadata.lang: en_GB
metadata.name: dc.type
metadata.value: Article
metadata.lang: en_GB
resources.filename: 03-Maslov.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/10249/1/03-Maslov.pdf
resources.format: Adobe PDF
resources.size: 2,1 MB