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 …
Uranium isotopes in marine carbonates as a global ocean paleoredox proxy: a critical review
The protracted oxygenation of the ocean-atmosphere system is one of the most fundamental
changes to the Earth system through its history. The uranium isotopic composition (238 …
changes to the Earth system through its history. The uranium isotopic composition (238 …
Electron flux is a key determinant of uranium isotope fractionation during bacterial reduction
Uranium isotopic signatures in the rock record are utilized as a proxy for past redox
conditions on Earth. However, these signatures display significant variability that …
conditions on Earth. However, these signatures display significant variability that …
[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 …
Modeling the impacts of diagenesis on carbonate paleoredox proxies
KV Lau, DS Hardisty - Geochimica et Cosmochimica Acta, 2022 - Elsevier
The geochemistry of the carbonate sedimentary record is invaluable for understanding the
ancient seawater evolution of carbon and redox-sensitive elements. However, the …
ancient seawater evolution of carbon and redox-sensitive elements. However, the …
[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 …
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 …
Hydrological controls on marine chemistry in the Cryogenian Nanhua Basin (South China)
In order to explore Cryogenian seawater chemistry and its underlying controls, we present
an integrated study of iron speciation, major and trace elements, and carbon isotopes of Mn …
an integrated study of iron speciation, major and trace elements, and carbon isotopes of Mn …
[HTML][HTML] Large environmental disturbances caused by magmatic activity during the Late Devonian Hangenberg Crisis
A wide range of various proxies (eg, mineralogy, organic carbon, inorganic geochemistry, C
and Mo isotopes, and framboidal pyrite) were applied for interpretation of changing oceanic …
and Mo isotopes, and framboidal pyrite) were applied for interpretation of changing oceanic …