[HTML][HTML] Uranium in natural waters and the environment: Distribution, speciation and impact
PL Smedley, DG Kinniburgh - Applied Geochemistry, 2023 - Elsevier
The concentrations of U in natural waters are usually low, being typically less than 4 μg/L in
river water, around 3.3 μg/L in open seawater, and usually less than 5 μg/L in groundwater …
river water, around 3.3 μg/L in open seawater, and usually less than 5 μg/L in groundwater …
Metal stable isotope signatures as tracers in environmental geochemistry
JG Wiederhold - Environmental science & technology, 2015 - ACS Publications
The biogeochemical cycling of metals in natural systems is often accompanied by stable
isotope fractionation which can now be measured due to recent analytical advances. In …
isotope fractionation which can now be measured due to recent analytical advances. In …
Improvements in 230Th dating, 230Th and 234U half-life values, and U–Th isotopic measurements by multi-collector inductively coupled plasma mass spectrometry
We have developed techniques for measuring 234U and 230Th on Faraday cups with
precisions of 1–3 epsilon units (1 ε-unit= 1 part in 104) using multi-collector inductively …
precisions of 1–3 epsilon units (1 ε-unit= 1 part in 104) using multi-collector inductively …
238U/235U Systematics in Terrestrial Uranium-Bearing Minerals
The present-day 238U/235U ratio has fundamental implications for uranium-lead
geochronology and cosmochronology. A value of 137.88 has previously been considered …
geochronology and cosmochronology. A value of 137.88 has previously been considered …
[HTML][HTML] Metrology and traceability of U–Pb isotope dilution geochronology (EARTHTIME Tracer Calibration Part I)
Abstract Mixed 235 U–233 U–205 Pb (–202 Pb) tracers for U–Pb isotope-dilution isotope
ratio mass spectrometry have been prepared under the auspices of the EARTHTIME …
ratio mass spectrometry have been prepared under the auspices of the EARTHTIME …
[HTML][HTML] Ice-sheet collapse and sea-level rise at the Bølling warming 14,600 years ago
P Deschamps, N Durand, E Bard, B Hamelin… - Nature, 2012 - nature.com
Past sea-level records provide invaluable information about the response of ice sheets to
climate forcing. Some such records suggest that the last deglaciation was punctuated by a …
climate forcing. Some such records suggest that the last deglaciation was punctuated by a …
Marine anoxia and delayed Earth system recovery after the end-Permian extinction
Delayed Earth system recovery following the end-Permian mass extinction is often attributed
to severe ocean anoxia. However, the extent and duration of Early Triassic anoxia remains …
to severe ocean anoxia. However, the extent and duration of Early Triassic anoxia remains …
Extensive marine anoxia during the terminal Ediacaran Period
The terminal Ediacaran Period witnessed the decline of the Ediacara biota (which may have
included many stem-group animals). To test whether oceanic anoxia might have played a …
included many stem-group animals). To test whether oceanic anoxia might have played a …
High-precision and high-resolution carbonate 230Th dating by MC-ICP-MS with SEM protocols
To facilitate the measurement of U–Th isotopic compositions suitable for high-precision and
high-resolution 230Th dating of coral and speleothem carbonates, secondary electron …
high-resolution 230Th dating of coral and speleothem carbonates, secondary electron …
Uranium and molybdenum isotope evidence for an episode of widespread ocean oxygenation during the late Ediacaran Period
To improve estimates of the extent of ocean oxygenation during the late Ediacaran Period,
we measured the U and Mo isotope compositions of euxinic (anoxic and sulfidic) organic …
we measured the U and Mo isotope compositions of euxinic (anoxic and sulfidic) organic …