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Osmium and lithium isotope evidence for weathering feedbacks linked to orbitally paced organic carbon burial and Silurian glaciations

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F22%3A00000242" target="_blank" >RIV/00025798:_____/22:00000242 - isvavai.cz</a>

  • Alternative codes found

    RIV/67985831:_____/22:00547736 RIV/60460709:41330/22:89943

  • Result on the web

    <a href="https://www.sciencedirect.com/science/article/abs/pii/S0012821X21005161" target="_blank" >https://www.sciencedirect.com/science/article/abs/pii/S0012821X21005161</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1016/j.epsl.2021.117260" target="_blank" >10.1016/j.epsl.2021.117260</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Osmium and lithium isotope evidence for weathering feedbacks linked to orbitally paced organic carbon burial and Silurian glaciations

  • Original language description

    The Ordovician (∼487 to 443 Ma) ended with the formation of extensive Southern Hemisphere ice sheets, known as the Hirnantian glaciation, and the second largest mass extinction in Earth History. It was followed by the Silurian (∼443 to 419 Ma), one of the most climatically unstable periods of the Phanerozoic as evidenced by several large scale (>5) carbon isotope (delta13C) perturbations associated with further extinction events. Despite several decades of research, the cause of these environmental instabilities remains enigmatic. Here, we provide osmium (187Os/188Os) and lithium (delta7Li) isotope measurements of marine sedimentary rocks that cover four Silurian delta13C excursions. Osmium and Li isotope records resemble those previously recorded for the Hirnantian glaciation suggesting a similar causal mechanism. When combined with a new dynamic carbon-osmium-lithium biogeochemical model we suggest that astronomical forcing of the marine organic carbon cycle, as opposed to a decline in volcanic arc degassing or the rise of early land plants, resulted in drawdown of atmospheric CO2, triggering continental scale glaciation, intense global cooling and eustatic sea-level lows recognised in the geological record. Lower atmospheric pCO2and temperatures during the Hirnantian and Silurian glaciations suppressed CO2removal by silicate weathering, driving 187Os/188Os and delta7Li variability, supporting the existence of climate-regulating feedbacks.

  • 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

    <a href="/en/project/GA21-10799S" target="_blank" >GA21-10799S: Environmental control on the rise and fall of the earliest land plant assemblages of Silurian volcanic islands of the Prague Basin (Czech Republic)</a><br>

  • Continuities

    I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Others

  • Publication year

    2022

  • Confidentiality

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

Data specific for result type

  • Name of the periodical

    Earth and Planetary Science Letters

  • ISSN

    0012-821X

  • e-ISSN

  • Volume of the periodical

    577

  • Issue of the periodical within the volume

    Jan : 117260

  • Country of publishing house

    NL - THE KINGDOM OF THE NETHERLANDS

  • Number of pages

    13

  • Pages from-to

    nestránkováno

  • UT code for WoS article

    000716452700007

  • EID of the result in the Scopus database

    2-s2.0-85118509507