Rationale Embedding resins are widely used to fix carbonates for high-precision sample preparation and high-resolution sampling. However, these embedding materials difficult remove after known affect the accuracy of carbonate stable isotope analyses. Nevertheless, their impact on clumped analysis, which is particularly sensitive contamination artifacts, has so far not been tested. The observati...

Microbial anaerobic oxidation of methane (AOM) substantially mitigates atmospheric emissions on Earth and is a process to consider for astrobiological targets where has been detected. The measurement doubly substituted, or “clumped”, isotopes proven useful in tracing processes formation oxidation. Both near-equilibrium extreme disequilibrium clumped isotope signatures can be attributed AOM, but...

Abstract. Periods of high atmospheric CO2 levels during the Cretaceous–early Paleogene (∼ 140 to 34 Myr ago) were marked by very polar temperatures and reduced latitudinal gradients relative Holocene. These features represent a challenge for most climate models, implying either higher-than-predicted sensitivity or systematic biases misinterpretations in proxy data. Here, we present reconstructi...

The potential for carbonate clumped isotope thermometry to independently constrain both the formation temperature of minerals and fluid oxygen composition allows insight into long-standing questions in Earth sciences, but remaining discrepancies between calibration schemes hamper interpretation measurements. To address calibrations, we designed analyzed a sample suite (41 total samples) with br...

Background and study species: The endangered oak Quercus brandegeei Goldman, endemic to Baja California Sur, Mexico, is threatened because of its relictual distribution restricted ephemeral riverbeds, declining populations, a lack seedling regeneration. Although there evidence viable acorn production, no seedlings or saplings have been found across the range occurrence for this species. 
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Clumped isotopes thermometry (?47) and U-Pb dating of carbonates have been used to elucidate the temperature-time conditions 10 tectonic calcite veins in hanging wall South Pyrenean Frontal Thrust (Spain), youngest thrust unit south-central Pyrenees. The ?47 values indicate precipitation temperatures below ?90 °C, agreement with fluid inclusion analyses. 6 successfully dated, giving ages betwee...

Context: The star cluster R136 inside the LMC hosts a rich population of massive stars, including most stars known. strong stellar winds these very luminous impact their evolution and surrounding environment. We currently lack detailed knowledge wind structure that is needed to quantify this impact. Aims: To observationally constrain properties in R136, particular parameters related clumping. M...