[HTML][HTML] Environmental controls on very high δ238U values in reducing sediments: Implications for Neoproterozoic seawater records
Uranium isotopes (δ 238 U) are a widely applied tool for tracing global changes in oceanic
anoxia. Interpretation of seawater values and trends, often reconstructed from carbonates …
anoxia. Interpretation of seawater values and trends, often reconstructed from carbonates …
[HTML][HTML] Effects of redox variability and early diagenesis on marine sedimentary Hg records
Volcanism is a dominant natural source of mercury (Hg) to the atmosphere, biosphere,
ocean and sediments. In recent years, sedimentary Hg contents have emerged as a tool to …
ocean and sediments. In recent years, sedimentary Hg contents have emerged as a tool to …
UID: The uranium isotope database
H Li, FLH Tissot - Chemical Geology, 2023 - Elsevier
As the parent element in the U-Pb and Pb-Pb radiochronometers, uranium (U) was one of
the first heavy elements whose isotopic composition was carefully determined. Thought to …
the first heavy elements whose isotopic composition was carefully determined. Thought to …
[HTML][HTML] Uranium isotope evidence for extensive seafloor anoxia after the end-Triassic mass extinction
The end-Triassic extinction (ETE) ranks as one of the 'Big Five'biotic crises of the
Phanerozoic and is thought to be triggered by volcanism of the Central Atlantic Magmatic …
Phanerozoic and is thought to be triggered by volcanism of the Central Atlantic Magmatic …
Exploring uranium isotopes in shark teeth as a paleo-redox proxy
The uranium isotope composition (δ 238 U) of seawater is a powerful proxy for the extent of
marine anoxia. For paleoredox reconstructions, carbonates are the most popular U isotope …
marine anoxia. For paleoredox reconstructions, carbonates are the most popular U isotope …
No evidence for expansion of global ocean euxinia during the base Stairsian mass extinction event (Tremadocian, Early Ordovician)
Abstract A Tremadocian (Early Ordovician, base Stairsian North American Stage) mass
extinction event is recorded globally in rocks from several ancient continents and is …
extinction event is recorded globally in rocks from several ancient continents and is …
[HTML][HTML] Co-variation systematics of uranium and molybdenum isotopes reveal pathways for descent into euxinia in Mediterranean sapropels
CF Chiu, TC Sweere, MO Clarkson… - Earth and Planetary …, 2022 - Elsevier
The elemental concentrations and isotope compositions of molybdenum (Mo) and uranium
(U) are commonly used for the reconstruction of past global and local redox conditions, and …
(U) are commonly used for the reconstruction of past global and local redox conditions, and …
[HTML][HTML] Marine nitrogen cycling dynamics under altering redox conditions: Insights from deposition of sapropels S1 and the ambiguous S2 in the Eastern …
ZR van Kemenade, A Cutmore, R Hennekam… - … et Cosmochimica Acta, 2023 - Elsevier
Abstract The eastern Mediterranean Sea (EMS) sedimentary record is periodically
interspersed with organic-rich 'sapropel'layers. Sapropels are characteristic of basin-wide …
interspersed with organic-rich 'sapropel'layers. Sapropels are characteristic of basin-wide …
Uranium isotopes in non-euxinic shale and carbonate reveal dynamic Katian marine redox conditions accompanying a decrease in biodiversity prior to the Late …
Abstract The Late Ordovician mass extinction (LOME) is the first major mass extinction event
in the Phanerozoic. However, global biodiversity started to decline during the Katian (prior to …
in the Phanerozoic. However, global biodiversity started to decline during the Katian (prior to …
[HTML][HTML] Source versus weathering processes as controls on the Mackenzie river uranium isotope signature
Uranium (U) isotope signatures (δ 238 U) recorded in sedimentary archives provide insight
into the paleo redox state of the ocean. But the robust interpretation of these sedimentary U …
into the paleo redox state of the ocean. But the robust interpretation of these sedimentary U …