Water stable isotopes in Greenland ice core data provide key paleoclimatic information, and have been compared with precipitation isotopic composition simulated by isotopically enabled atmospheric models. However, postdepositional processes linked with snow metamorphism remain poorly documented. For this purpose, monitoring of the isotopic composition (δ18O, δD) of near-surface water vapor, pre...

Introduction: Genesis collected solar wind (SW) ions with one major objective being to obtain abundances and isotopic composition of ultra-volatile elements. The SW is a proxy for the composition of the solar outer convective zone (OCZ) and, hence for the solar nebula. For most elements accurate values for the isotopic composition of sun can be inferred from meteorites. Carbonaceous chondrites ...

available online at http://meteoritics.org 1509 © Meteoritical Society, 2004. Printed in USA. Potassium isotopic composition of Australasian tektites Munir HUMAYUN1†* and Christian KOEBERL2 1Department of Geophysical Sciences, The University of Chicago, Chicago, Illinois 60637, USA 2Department of Geological Sciences, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria †Present addres...

This paper presents a comprison of the isotopic values of eight pairings of hair keratin and bone collagen and 12 pairings of hair keratin and nail keratin taken from living humans resident in the U.K., with the aim of examining whether modern human isotopic data can be directly compared to archaeological isotopic data. Results showed that bone collagen was enriched relative to hair keratin fro...

The isotopic composition of our Solar System reflects the blending of materials derived from numerous past nucleosynthetic events, each characterized by a distinct isotopic signature. We show that the isotopic compositions of elements spanning a large mass range in the earliest formed solids in our Solar System, calcium-aluminum-rich inclusions (CAIs), are uniform, and yet distinct from the ave...

Consumer foraging behaviors are dynamic, changing in response to prey availability, seasonality, competition, and even the consumer’s physiological state. The isotopic composition of a consumer is a product of these factors as well as the isotopic “landscape” of its prey, i.e., the isotopic mixing space. Stable isotope mixing models are used to back-calculate the most likely proportional contri...

Bulk soil organic carbon concentration and isotopic composition characterize its sources and fate, identify the anthropogenic input of organic carbon into the soil, and trace soil carbon turnover. Coal and/or coal combustion products represent the prime anthropogenic input of organic carbon into three soil profiles located in the vicinity of a steel company. Three profiles positioned away from ...

Absolute values have been obtained for the isotopic abundance ratios of a reference sample of nickel (Standard Reference Material 986), using thermal ionization mass spectrometry. Samples of known isotopic composition, prepared from nearly isotopically pure separated nickel isotopes, were used to calibrate the mass spectrometers. The resulting absolute isotopic ratios are: 58Ni/60Ni=2.596061±0....

The isotopic composition of different materials can be imaged by secondary ion mass spectrometry. In biology, this method is mainly used to study cellular metabolism and turnover, by pulsing the cells with marker molecules such as amino acids labelled with stable isotopes ((15)N, (13)C). The incorporation of the markers is then imaged with a lateral resolution that can surpass 100 nm. However, ...