Global marine redox evolution from the late Neoproterozoic to the early Paleozoic constrained by the integration of Mo and U isotope records
The emergence and diversification of early animals is commonly thought to have coincided
with atmosphere and ocean oxygenation across the terminal Neoproterozoic and early …
with atmosphere and ocean oxygenation across the terminal Neoproterozoic and early …
[HTML][HTML] Sulfidic anoxia in the oceans during the Late Ordovician mass extinctions–insights from molybdenum and uranium isotopic global redox proxies
Abstract The Late Ordovician Mass Extinction wiped out 85% of animal species in two
phases (LOME1 and LOME2). The kill mechanisms for the extinction phases are debated …
phases (LOME1 and LOME2). The kill mechanisms for the extinction phases are debated …
Thallium isotopes reveal protracted anoxia during the Toarcian (Early Jurassic) associated with volcanism, carbon burial, and mass extinction
For this study, we generated thallium (Tl) isotope records from two anoxic basins to track the
earliest changes in global bottom water oxygen contents over the Toarcian Oceanic Anoxic …
earliest changes in global bottom water oxygen contents over the Toarcian Oceanic Anoxic …
[HTML][HTML] Precipitation of molybdenum from euxinic waters and the role of organic matter
GR Helz, TP Vorlicek - Chemical Geology, 2019 - Elsevier
Molybdenum preserved in organic-rich shales is a key archive employed in studying Earth's
past oxygenation and Life's evolution. In these shales, positive correlations between Mo and …
past oxygenation and Life's evolution. In these shales, positive correlations between Mo and …
[HTML][HTML] Dynamic oceanic redox conditions across the late Cambrian SPICE event constrained by molybdenum and uranium isotopes
Abstract The Steptoean Positive Carbon Isotope Excursion Event (SPICE) represents one of
the largest carbon cycle perturbations in the Cambrian, which coincided with climatic …
the largest carbon cycle perturbations in the Cambrian, which coincided with climatic …
Correlated molybdenum and uranium isotope signatures in modern anoxic sediments: Implications for their use as paleo-redox proxy
Redox-sensitive trace metals and their isotopes have emerged as important tools that are
used to reconstruct the redox-evolution of the ocean-atmosphere system. However …
used to reconstruct the redox-evolution of the ocean-atmosphere system. However …
Molybdenum isotope-based redox deviation driven by continental margin euxinia during the early Cambrian
Oceanic redox changes may be a key environmental trigger for the “Cambrian explosion”.
However, a hypothesized predominantly oxygenated early Cambrian ocean, inferred from …
However, a hypothesized predominantly oxygenated early Cambrian ocean, inferred from …
Controls of eustasy and diagenesis on the 238U/235U of carbonates and evolution of the seawater (234U/238U) during the last 1.4 Myr
FLH Tissot, C Chen, BM Go, M Naziemiec… - … et Cosmochimica Acta, 2018 - Elsevier
Using a leaching protocol designed for the study of U isotopes in recent carbonates, we
measured the U isotope composition, both 238 U/235 U and 234 U/238 U, of modern and …
measured the U isotope composition, both 238 U/235 U and 234 U/238 U, of modern and …
Redox dynamics of later Cambrian oceans
A growing body of evidence suggests that the deep oceans during the early Paleozoic Era
were widely oxygen deficient, despite evidence for increased marine oxygenation during the …
were widely oxygen deficient, despite evidence for increased marine oxygenation during the …
A critical review of molybdenum sequestration mechanisms under euxinic conditions: Implications for the precision of molybdenum paleoredox proxies
R Phillips, J Xu - Earth-Science Reviews, 2021 - Elsevier
The observed difference in molybdenum (Mo) mobility and isotopic fractionation under oxic
versus euxinic (ie, anoxic and sulfidic) aqueous conditions provides a sound operational …
versus euxinic (ie, anoxic and sulfidic) aqueous conditions provides a sound operational …