Results 191 to 195 of about 25,230 (195)

Coupled sulfur-silicon isotopes reveal supracrustal origin of Archean continents. [PDF]

Nat Commun
Shang K, Zhang J, Wang Z, Cawood I, Cui Y, Li M, Chang R, Shen Y, Zhao G.   +8 more
europepmc   +1 more source

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Shellfish, Seasonality, and Sedentism: δ18O Analysis of California Mussels from Early Holocene Shell Middens on San Miguel Island, California

Journal of Pacific Archaeology, 2013
We estimate seasonality of shellfish harvest and site occupation for four Early Holocene shell middens on California’s San Miguel Island using a robust dataset of 449 δ18O measurements from 84 mussel shells (Mytilus californianus). Seasonality was assigned to prehistoric mussels using palaeo sea-surface temperature (PSST) estimates from isotopic data ...
Nicholas P Jew, Jon M Erlandson, Torben C Rick, Jack Watts   +3 more
openaire   +1 more source

Improving the accuracy of δ18O and δ17O values of O2 measured by continuous-flow isotope-ratio mass spectrometry with a multipoint isotope-ratio calibration

Rapid communications in mass spectrometry : RCM
Stable isotope analysis of O2 is a valuable tool to identify O2 -consuming processes in the environment; however, reference materials for O2 isotope analysis are lacking. Consequently, a one-point calibration with O2 from ambient air is often applied, which can lead to substantial measurement uncertainties. Our goals were to develop a simple multipoint
Carolina F M, de Carvalho, Moritz F, Lehmann, Sarah G, Pati   +2 more
openaire   +2 more sources

The δ13C and δ18O signatures of siderite a tool to discriminate mixis patterns in ancient lakes

Zeitschrift der Deutschen Gesellschaft für Geowissenschaften, 2006
Marita Felder, Reinhard Gaupp
openaire   +1 more source