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Equilibrium and nonequilibrium oxygen isotope effects in synthetic carbonates
Abstract A suite of divalent metal (Ca, Cd, Ba) carbonates was synthesized over the temperature range 10–40°C by the classical method of slowly bubbling N 2 through a bicarbonate solution. It wasExpand
Oxygen isotope fractionation between synthetic aragonite and water: Influence of temperature and Mg2+ concentration
Aragonite was precipitated in the laboratory at 0, 5, 10, 25, and 40 C to determine the temperature dependence of the equilibrium oxygen isotope fractionation between aragonite and water. Forced CO2Expand
Phosphoric acid fractionation factors for calcite and aragonite between 25 and 75 °C: Revisited
This paper reports the results of an investigation to re-determine the phosphoric acid fractionation factor for calcite and aragonite in order to improve the accuracy and limit the uncertainty ofExpand
Reconstructing Earth's surface oxidation across the Archean-Proterozoic transition
The Archean-Proterozoic transition is characterized by the widespread deposition of organic-rich shale, sedimentary iron formation, glacial diamictite, and marine carbonates recording profound carbonExpand
Sulfate was a trace constituent of Archean seawater
TLDR
Low levels of sulfate allowed for the preservation of mass-independent isotope signatures in the Archean, yet open questions frustrate the translation of modern measurements of sulfur isotope fractionations into estimates of Archean seawater sulfate concentrations. Expand
Oxygen isotope fractionation between synthetic aragonite and water : Influence of temperature and Mg 2 + concentration
Aragonite was precipitated in the laboratory at 0, 5, 10, 25, and 40 C to determine the temperature dependence of the equilibrium oxygen isotope fractionation between aragonite and water. Forced CO2Expand
Normalization of stable isotope data for carbonate minerals: Implementation of IUPAC guidelines
Abstract Carbonate minerals provide a rich source of geochemical information because their δ13C and δ18O values provide information about surface and subsurface Earth processes. However, aExpand
Mechanisms of equilibrium and kinetic oxygen isotope effects in synthetic aragonite at 25 °C
Aragonite was precipitated in the laboratory at 25 C in isotopic equilibrium with Na-Ca-Mg-Cl-CO3 solutions at two different pH values (i.e., pH = � 8.2 and � 10.8) by the constant addition method.Expand
Functional motifs in the (6-4) photolyase crystal structure make a comparative framework for DNA repair photolyases and clock cryptochromes
TLDR
Conservation of key residues and motifs controlling FAD access and activities suggests that regulation of FAD redox properties and radical stability is essential not only for (6-4) photoproduct DNA repair, but also for circadian clock-regulating CRY functions. Expand
Implications from sulfur isotopes of the Nakhla meteorite for the origin of sulfate on Mars
Abstract The isotope geochemistry of sulfur in the SNC (Shergottite, Nakhlite, Chassignite) meteorites may carry important implications for the origin and chemistry of sulfates and sulfides in theExpand
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