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

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>

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

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10505 - Geology

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

Publication year

2022

Confidentiality

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

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