Marine anoxia as a trigger for the largest Phanerozoic positive carbon isotope excursion: evidence from carbonate barium isotope records
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F22%3A00000232" target="_blank" >RIV/00025798:_____/22:00000232 - isvavai.cz</a>
Alternative codes found
RIV/60460709:41330/22:89944
Result on the web
<a href="https://www.sciencedirect.com/science/article/abs/pii/S0012821X22000577" target="_blank" >https://www.sciencedirect.com/science/article/abs/pii/S0012821X22000577</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.epsl.2022.117421" target="_blank" >10.1016/j.epsl.2022.117421</a>
Alternative languages
Result language
angličtina
Original language name
Marine anoxia as a trigger for the largest Phanerozoic positive carbon isotope excursion: evidence from carbonate barium isotope records
Original language description
The mid-Ludfordian Lau carbon isotope excursion (Lau CIE) represents the largest positive carbon isotope excursion in the Phanerozoic (∼9), coincident with the biodiversity loss of many marine animal clades. Two main explanations for the Lau CIE are enhanced organic carbon burial via increased marine productivity and preservation-driven expansion of anoxia. While these two explanations are not mutually exclusive, the main driver of Lau CIE is yet to be constrained. Here, we resolve this longstanding debate using barium isotopes (delta138Ba) of marine carbonates deposited across the Lau CIE. Our delta138Badata from the Kosov section (Czech Republic) record a large negative excursion in correlation to the positive shift in delta13Ccarb. We suggest that the observed negative shift in delta138Bato values as low as −0.33can be best interpreted as upwelling of isotopically light Ba from deeper waters due to pelagic barite dissolution under euxinic conditions. This hypothesis is consistent with results from barium concentration data as well as the results from the sulfate mass balance modeling that indicates a contraction in the seawater sulfate reservoir, with seawater sulfate concentrations decreasing from several mM ranges before the Lau CIE to less than 100míM during Lau CIE. Taken together, evidence for a strong negative correlation between delta138Baand delta13Ccarbsuggests that shallow water anoxia, rather than enhanced marine productivity, was a primary driver of the Lau CIE that resulted in a notable decrease in the size of seawater sulfate reservoir.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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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
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Volume of the periodical
584
Issue of the periodical within the volume
Apr : 117421
Country of publishing house
NL - THE KINGDOM OF THE NETHERLANDS
Number of pages
11
Pages from-to
nestránkováno
UT code for WoS article
000782123400003
EID of the result in the Scopus database
2-s2.0-85126276072