The oxygen isotopic composition of calcite from carbonate rocks of the lower unit of the Flagstaff formation (Paleocene) exposed along the western margin of the Wasatch Plateau, Utah, is about 7 per mil lower than that of coexisting dolomite, suggesting that isotopic equilibration of these two minerals can occur at relatively low temperatures. Unlike recent isotopic evidence presented by Degens...

The potential of the low-cost MAGIS isotopic separation method to improve fluorescent lamp efficacy is explored using resonance radiation transport simulations. New Hg isotopic mixes are discovered that yield escape rates for 254 nm Hg I resonance radiation equal to 117% to 122% of the rate for a natural isotopic mix under the same lamp conditions. (Some figures may appear in colour only in the...

Major negative oxygen isotopic anomalies in planktonic foraminifera are associated with deep-sea anoxic mud layers (sapropels) deposited 9000 and 80,000 years ago in the eastern Mediterranean. The isotopic depletion in surface-dwelling foraminifera is significantly greater than in mesopelagic foraminifera. This difference in isotopic response suggests that surface-water salinities were drastica...

The isotopic niche has become an established concept in trophic ecology. However, the assumptions behind this approach have rarely been evaluated. Evidence is accumulating that physiological stress can affect both magnitude and inter-individual variability of the isotopic signature in consumers via alterations in metabolic pathways. We hypothesized that stress factors (inadequate nutrition, par...

Applications of speleothem calcite geochemistry in climate change studies require the evaluation of the accuracy and sensitivity of speleothem proxies to correctly infer paleoclimatic information. The present study of Harrison’s Cave, Barbados, uses the analysis of the modern climatology and groundwater system to evaluate controls on the C and O isotopic composition of modern speleothems. This ...

We show that there are homeomorphisms of closed oriented genus g surfaces Σg which are fiber-preserving with respect to an irregular branched covering Σg → S2 and isotopic to the identity, but which are not fiber-isotopic to the identity.

submitted for GGMT-2017 Using Isotopic Fingerprints to Trace Nitrous Oxide in the Atmosphere Joachim Mohn, Béla Tuzson, Eliza Harris, Stephan Henne, Benjamin Wolf, Erkan Ibraim, Longfei Yu, Christoph Zellweger, Lukas Emmenegger 1 Empa, Laboratory for Air Pollution / Environmental Technology, CH-8600 Dübendorf, Switzerland; [email protected] 2 University of Innsbruck, Institute of Ecology, Pl...

available online at http://meteoritics.org 721 © The Meteoritical Society, 2005. Printed in USA. In situ survey of graphite in unequilibrated chondrites: Morphologies, C, N, O, and H isotopic ratios Smail MOSTEFAOUI1*, Ernst ZINNER2, Peter HOPPE1, Frank J. STADERMANN2, and Ahmed EL GORESY1 1Max-Planck-Institut für Chemie, Postfach 3060, 55020 Mainz, Germany 2Laboratory for Space Sciences and Ph...

The fan mussel Pinna nobilis is a rapidly growing suspension-feeding bivalve endemic to the Mediterranean Sea and usually inhabits seagrass meadows. This endangered bivalve assimilates carbon and nitrogen isotopic ratios in tissues from its food sources. The dC and dN signatures were used to demonstrate isotopic variation among three tissues (digestive gland, gills and muscle) and (for digestiv...

The isotope signatures registered in speleothems during tropical cyclones (TC) provides information about the frequency and intensity of past TCs but the precise relationship between isotopic composition and the meteorology of TCs remain uncertain. Here we present continuous δ18O and δ2H data in rainfall and water vapour, as well as in discrete rainfall samples, during the passage of TC Ita and...