title: Lithology of the Upper Jurassic–Lower Cretaceous deposits of the eastern part of the Myrgovaam and Rauchua depressions, Western Chukotka
metadata.name: dc.contributor.author
metadata.value: Vatrushkina, Elena V.
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Tuchkova, Marianna I.
metadata.lang: -
metadata.name: dc.date.accessioned
metadata.value: 2021-02-11T20:26:02Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2021-02-11T20:26:02Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2020-12
metadata.lang: -
metadata.name: dc.identifier.citation
metadata.value: Vatrushkina, E. V., Tuchkova, M. I. (2020). Lithology of the Upper Jurassic–Lower Cretaceous deposits of the eastern part of the Myrgovaam and Rauchua depressions, Western Chukotka. Vestnik of Saint Petersburg University. Earth Sciences, 65 (4), 717–739.
metadata.lang: en_GB
metadata.name: dc.identifier.other
metadata.value: https://doi.org/10.21638/spbu07.2020.407
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/23891
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: Upper Jurassic–Lower Cretaceous deposits were formed on the southwestern margin of the
  Chukotka terrane in an active tectonic environment. Their stratigraphic units are characterized
  by sedimentary structures and lithological similarities, facies variation and scarcity of reliable
  fauna findings. Detailed lithological studies are necessary due to the absence of a unified approach
  to the stratigraphic division of deposits. This paper presents petrographic, geochemical,
  and isotope-geochemical characteristics of Upper Jurassic–Lower Cretaceous rocks. The
  stages of changing sedimentation conditions and sources, which determined the differences in
  sedimentological features and the composition of the studied strata, are reconstructed. The Oxford-
  Kimmeridgian section is composed of sandy debris flow deposits with an arkosic composition
  of psammitic differences. Among their sources, ancient granitoids dominated, while siliciclastic
  rocks, volcanites and metamorphic complexes were secondary. The Volgian-Valanginian
  interval is characterized by the accumulation of sediments in various parts of the submarine fan.
  In Volgian sequences fine-, medium- and coarse-grained turbidites with lenses of small-pebble
  conglomerates are identified. A large amount of simultaneous pyroclastic material in the Volgian
  deposits indicates synchronous volcanic activity. In the Volgian period, the province was dominated
  by volcanites, mainly of basaltic and andesitic composition; siliciclastic rocks were present
  in a smaller amount. The Berriasin section is composed of fine-grained turbidites with single
  horizons of medium-grained turbidites and gravelitic lenses, as well as slope deposits in the form
  of rhythmically interbedded sandstones and mudstones with slump structures. Sandstones have
  greywacke composition and contain an admixture of ash material in the matrix. The main sources for Berriasian deposits were siliciclastic rocks and felsic volcanic complexes. The Valanginian
  section is represented by fine- and medium-grained turbidites with horizons of amalgamated
  sandstones. Sandstones are classified as arkoses by the ratio of rock-forming components. The
  dominant source in the Valanginian time was ancient granitoids, while siliciclastic rocks and
  volcanites were secondary.
metadata.lang: en_GB
metadata.name: dc.description.sponsorship
metadata.value: The work was carried out within the framework of the theme on the State Assignment of the GIN
  RAS with financial support from the Russian Science Foundation grant No. 18-77-10073.
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 65; Issue 4
metadata.lang: -
metadata.name: dc.subject
metadata.value: Upper Jurassic–Lower Cretaceous
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: sandy debris flow
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: turbidites
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: petrography
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: sedimentary geochemistry
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: provenance
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: Western Chukotka
metadata.lang: en_GB
metadata.name: dc.title
metadata.value: Lithology of the Upper Jurassic–Lower Cretaceous deposits of the eastern part of the Myrgovaam and Rauchua depressions, Western Chukotka
metadata.lang: en_GB
metadata.name: dc.type
metadata.value: Article
metadata.lang: en_GB
resources.filename: 717-739.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/23891/1/717-739.pdf
resources.format: Adobe PDF
resources.size: 6,9 MB