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

Kód výsledku v 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>

Nalezeny alternativní kódy

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

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GA21-10799S" target="_blank" >GA21-10799S: Vliv prostředí na vzestup a pád nejstarších rostlinných společenstev, která osídlila silurské vulkanické ostrovy Pražské pánve (Česká republika)</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Earth and Planetary Science Letters

ISSN

0012-821X

e-ISSN

—

Svazek periodika

577

Číslo periodika v rámci svazku

Jan : 117260

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

13

Strana od-do

nestránkováno

Kód UT WoS článku

000716452700007

EID výsledku v databázi Scopus

2-s2.0-85118509507