Mid-Ludfordian uranium isotope records distinguish the role of expansive marine anoxia in global carbon cycle dynamics during the late Silurian Lau/Kozlowskii bioevent

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60460709%3A41330%2F23%3A96340" target="_blank" >RIV/60460709:41330/23:96340 - isvavai.cz</a>

Result on the web

<a href="https://www-sciencedirect-com.infozdroje.czu.cz/science/article/pii/S0921818123002217?via%3Dihub" target="_blank" >https://www-sciencedirect-com.infozdroje.czu.cz/science/article/pii/S0921818123002217?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.gloplacha.2023.104248" target="_blank" >10.1016/j.gloplacha.2023.104248</a>

Result language

angličtina

Original language name

Mid-Ludfordian uranium isotope records distinguish the role of expansive marine anoxia in global carbon cycle dynamics during the late Silurian Lau/Kozlowskii bioevent

Original language description

The late Silurian Lau/Kozlowskii bioevent marks a time interval with substantial loss in marine biodiversity linked to the largest positive carbon isotope excursion (Mid-Ludfordian CIE; MLCIE) recorded in the Phanerozoic (delta C-13(carb) peaks at +8-10 parts per thousand). The positive delta C-13 excursion and the extinctions have been linked to increased marine productivity (ocean eutrophication), leading to increased organic carbon burial, and expansion of marine anoxia in shallow continental seas. To explore this idea, we reconstruct the contemporaneous global extent of marine anoxia using uranium (U) isotopes from Ludfordian marine carbonates sampled from two widely spaced paleogeographic locations. Our delta U-238 results demonstrate that the overall MLCIE was not coupled to expanding marine anoxia and a presumed associated increased marine primary productivity. Instead, a time interval of widespread global anoxia occurred only before and during the onset of the MLCIE (up to end of P. siluricus conodont zone; ca. delta C-13 similar to 2.6 parts per thousand), which is when the extinctions took place. Strong climatic variability at this time suggests anoxia and climate change led to the extinctions of the Lau/Kozlowskii bioevent. The major part of the rise to the peak (delta C-13 similar to 10 parts per thousand) and falling limb of the MLCIE was not coupled with corresponding changes in delta U-238 values. Thus, increased marine primary productivity and marine anoxia may have caused the initial carbon cycle disturbance and the extinctions but was not a main driver for the continued growth and exceptional magnitude of the MLCIE.

Czech name

—

Czech description

—

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

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)

Publication year

2023

Confidentiality

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

Name of the periodical

GLOBAL AND PLANETARY CHANGE

ISSN

0921-8181

e-ISSN

0921-8181

Volume of the periodical

229

Issue of the periodical within the volume

104248

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

9

Pages from-to

1-9

UT code for WoS article

001099957500001

EID of the result in the Scopus database

2-s2.0-85172150229