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Arc-related black shales as sedimentary archives of sea-level fluctuations and plate tectonics during the late Neoproterozoic: An example from the Bohemian Massif

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F21%3A00000017" target="_blank" >RIV/00025798:_____/21:00000017 - isvavai.cz</a>

  • Alternative codes found

    RIV/67985831:_____/21:00533896 RIV/00216208:11310/21:10420138

  • Result on the web

    <a href="https://www.sciencedirect.com/science/article/pii/S0264817220304967?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0264817220304967?via%3Dihub</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1016/j.marpetgeo.2020.104713" target="_blank" >10.1016/j.marpetgeo.2020.104713</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Arc-related black shales as sedimentary archives of sea-level fluctuations and plate tectonics during the late Neoproterozoic: An example from the Bohemian Massif

  • Original language description

    The late Neoproterozoic Lečice black shales and an overlying siliciclastic succession, Bohemian Massif, were directly deposited in a marine environment on a volcanic arc and provide insights into palaeoenvironmental conditions at the former active margin of northern Gondwana. Field relationships integrated with major/trace element and Mo–Cr–S isotope systematics in two different sections (Štěchovice and Břežany) indicate complex depositional settings intimately connected with the waning activity of the underlying volcanic arc. The Štěchovice black shales represent a deeper part of the basin and were first deposited in weakly anoxic conditions (lower stratigraphic level) with limited terrigenous supply, as reflected by their higher total organic carbon (TOC) and U contents and positive d53Cr, but negative d34Spyrite values accompanied by late-stage silicification by arc-related fluids. An abrupt change to oxygenated conditions and increased terrigenous flux, characterized by lower TOC, U and Mo and coupled, negative d53Cr and d98Mo, is documented in the upper level of the same section. By contrast, the Břežany black shales were deposited in a shallower part of the basin and their composition (e.g., low metal contents, negative d53Cr and d98Mo) suggests oxygenated conditions. Furthermore, the extensive syn- to post-depositional silicification by low-temperature hydrothermal fluids was associated with Si and Ba enrichment and elevated bacterial productivity leading to higher organic matter input. The black shale deposition was terminated by arc uplift, which supplied vast amounts of terrigenous material to the basin and produced a thick flysch sequence deposited at oxygenated conditions. The estimated age of the Lečice black shales (~580–560 Ma) suggests that their deposition may be linked to interactions between global eustatic sea level changes in response to the late Neoproterozoic glaciations (Gaskiers, Farquar) and dynamic arc topography.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    10505 - Geology

Result continuities

  • Project

    Result was created during the realization of more than one project. More information in the Projects tab.

  • Continuities

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Others

  • Publication year

    2021

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Marine and Petroleum Geology

  • ISSN

    0264-8172

  • e-ISSN

  • Volume of the periodical

    123

  • Issue of the periodical within the volume

    January : 104713

  • Country of publishing house

    GB - UNITED KINGDOM

  • Number of pages

    21

  • Pages from-to

    nestránkováno

  • UT code for WoS article

    000598618800001

  • EID of the result in the Scopus database

    2-s2.0-85094187598