Carbonate clumped isotopes (Δ47) have become a widely applied method for paleothermometry, with applications spanning many environmental settings over hundreds of millions years. However, Δ47-based paleothermometry can be complicated by closure temperature-like behavior whereby C–O bonds are reset at elevated diagenetic or metamorphic temperatures, sometimes without obvious mineral alteration. ...

Abstract Atmospheric methane (CH 4 ) and its isotopic composition trends over the last decades are explained by various flux scenarios, from tropical wetland emission increases through to reductions in global hydroxyl (OH). In this study, we develop a modeling framework assess potential usefulness of clumped isotope measurements distinguish between main drivers change CH burden. We model interh...

Sequential analyses of δ13C, δ18O and Δ47 values calcite dolomite deposited in millimetre-sized cavities are reported from the Ronaldsway Member packstones, Isle Man. The brachiopods have δ13C ca +2.3‰ −7.2‰; carbon is like predicted Carboniferous values, while oxygen more negative. show preserved microstructure but marginal alteration a streaky cathodoluminescence pattern. Crinoid ossicles one...

It has been suggested that the pressor effect of hypertonic solutions of sodium chloride on the pulmonary circulation results from spasm of the pulmonary veins at their junction with the left atrium. These studies demonstrate that the increased resistance in the pulmonary vessels develops upstream to this site and that it may result primarily from mechanical blockage of vessels by clumped eryth...

Pedogenic carbonate is widespread at mid latitudes where warm and dry conditions favor soil growth from spring to fall. The mechanisms timing of pedogenic formation are more ambiguous in the tropical domain, long periods water saturation high respiration enhance calcite dissolution. This paper provides stable carbon, oxygen clumped isotope values Quaternary Miocene carbonates domain Myanmar, ar...

Hot massive stars exhibit strong stellar winds that enrich the surrounding interstellar medium and affect stars' evolution. However, are inhomogeneous (clumped) difficult to model in radiative transfer codes. To produce more realistic spectra many codes use a volume-filling factor approach incorporate effects of clumping. While this is convenient it simplistic. We introduce an alternative clump...