TY - JOUR

T1 - Mid-Ludfordian uranium isotope records distinguish the role of expansive marine anoxia in global carbon cycle dynamics during the late Silurian Lau/Kozlowskii bioevent

AU - del Rey, Álvaro

AU - Frýda, Jiří

AU - Calner, Mikael

AU - Frýdová, Barbora

AU - Zhang, Feifei

AU - Wang, Changle

AU - Planavsky, Noah

AU - Dahl, Tais W.

N1 - Publisher Copyright: © 2023

PY - 2023

Y1 - 2023

N2 - 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 (δ13Ccarb peaks at +8–10‰). The positive δ13C 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 δ238U 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. δ13C ∼ 2.6‰), 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 (δ13C ∼ 10‰) and falling limb of the MLCIE was not coupled with corresponding changes in δ238U 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.

AB - 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 (δ13Ccarb peaks at +8–10‰). The positive δ13C 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 δ238U 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. δ13C ∼ 2.6‰), 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 (δ13C ∼ 10‰) and falling limb of the MLCIE was not coupled with corresponding changes in δ238U 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.

KW - Late Silurian

KW - Lau/Kozlowskii bioevent

KW - Marine carbonates

KW - Ocean anoxia

KW - U isotopes

KW - Uranium cycle

U2 - 10.1016/j.gloplacha.2023.104248

DO - 10.1016/j.gloplacha.2023.104248

M3 - Journal article

AN - SCOPUS:85172150229

VL - 229

JO - Palaeogeography, Palaeoclimatology, Palaeoecology - An International Journal for the Geo-Sciences

JF - Palaeogeography, Palaeoclimatology, Palaeoecology - An International Journal for the Geo-Sciences

SN - 0031-0182

M1 - 104248

ER -