New type of filaments for improved accuracy of multiple sulfur isotope analyses by electron-impact gas-source mass spectrometry.

Rationale: The analysis of the three sulfur stable isotope ratios (S/S, S/S, S/S) is routinely performed by gas-source isotope ratio mass spectrometry (IRMS) on the SF gaseous molecule, collecting SF ions at m/z ~ 127, 128, 129 and 131. High precision and accuracy are commonly achieved owing to a lack of correction because fluorine has only one isotope and the inert nature of the SF molecule. The analysis of the S/S ratio is, however, complicated by the low abundance of S (~0.

The Dziani Dzaha Lake: A long-awaited modern analogue for superheavy pyrites.

Sedimentary records of superheavy pyrites in Phanerozoic and Proterozoic successions (i.e., extremely positive δ S values together with higher δ S than coeval δ S ) are mostly interpreted as resulting either from secondary postdepositional processes or from multiple redox reactions between sulfate and sulfide in stratified sulfate-poor environments.

Multi O- and S-isotopes as tracers of black crusts formation under volcanic and non-volcanic atmospheric conditions in Sicily (Italy).

The deterioration of monument or building stone materials is mostly due to the growth of black crusts that cause blackening and disaggregation of the exposed surface. This study reports on new oxygen (δO, δO and ΔO) and sulphur (δS, δS, δS, ΔS and ΔS) isotopic analyses of black crust sulphates formed on building stones in Sicily (Southern Italy). The measurements are used to identify the possible influence of volcanic emissions on black crust formation.

Early oxidation of the martian crust triggered by impacts.

Despite the abundant geomorphological evidence for surface liquid water on Mars during the Noachian epoch (>3.7 billion years ago), attaining a warm climate to sustain liquid water on Mars at the period of the faint young Sun is a long-standing question. Here, we show that melts of ancient mafic clasts from a martian regolith meteorite, NWA 7533, experienced substantial Fe-Ti oxide fractionation.

Author Correction: Constraining the rise of oxygen with oxygen isotopes.

An amendment to this paper has been published and can be accessed via a link at the top of the paper.