Results 301 to 310 of about 2,285,311 (372)
Some of the next articles are maybe not open access.
Reviews in Mineralogy and Geochemistry, 2003
Isotopic and trace element analysis of zircons can provide reliable and robust estimates of age, compositions of coexisting minerals and melts, and constraints on the genesis and protoliths of host rocks. Recent technological developments facilitate analysis of oxygen isotope ratios in zircon with high accuracy and precision by laser heating/gas-source
J. Valley
openaire +2 more sources
Isotopic and trace element analysis of zircons can provide reliable and robust estimates of age, compositions of coexisting minerals and melts, and constraints on the genesis and protoliths of host rocks. Recent technological developments facilitate analysis of oxygen isotope ratios in zircon with high accuracy and precision by laser heating/gas-source
J. Valley
openaire +2 more sources
Oxygen isotopes in bioarchaeology: Principles and applications, challenges and opportunities
Earth-Science Reviews, 2019Oxygen isotope analyses of skeletal remains (18O/16O, δ18O) are a powerful tool for exploring major themes in bioarchaeology (the study of biological archaeological remains) and can aid in the reconstruction of past human-environment interactions, socio ...
S. Pederzani, K. Britton
semanticscholar +1 more source
Oxygen isotope cosmothermometer
Geochimica et Cosmochimica Acta, 1972Variations in oxygen isotopic abundances of meteoritic minerals, chondrules, whole meteorites, and planets are discussed in terms of a model involving isotopic exchange between primordial dust and a cooling solar nebular gas. From the temperature-dependence of the isotopic fractionation factors, temperatures have been assigned to the processes of ...
Naoki Onuma +2 more
openaire +1 more source
Isotope ratios in photosynthetic oxygen
Biochimica et Biophysica Acta (BBA) - Bioenergetics, 1979Axenic suspensions of the fresh water green alga Ankistrodesmus braunii were illuminated under aerobic conditions. The released gas mixture was introduced into the ion source of an isotope mass spectrometer, which recorded the 18O/16O ratio.
H, Metzner, K, Fischer, O, Bazlen
openaire +2 more sources
Oxygen Isotope Zoning in Garnet
Science, 1991Oxygen isotope zoning was examined within garnet with the use of the stable isotope laser probe. Four metamorphic garnets from the regional metamorphic terrane in Vermont and the skarn deposit at Carr Fork, Utah, were examined and were found to be concentrically zoned in δ 18 O values. The largest variations in δ
C P, Chamberlain, M E, Conrad
openaire +2 more sources
Oxygen isotopes trace the origins of Earth’s earliest continental crust
Nature, 2021R. H. Smithies +9 more
semanticscholar +1 more source
Industrial separation of oxygen isotopes by oxygen distillation
Journal of Labelled Compounds and Radiopharmaceuticals, 201918O‐labeled water (Water‐18O) is a widely used starting material of 18F‐labeled diagnostic agents in positron emission tomography (PET). Conventionally, Water‐18O has been separated from other stable oxygen isotope species (16O, 17O) by water distillation or nitric oxide distillation. However, conventional methods are costly and may have safety issues.
Takehiro Igarashi +2 more
openaire +2 more sources
Quaternary Research, 2000
AbstractThe GISP2 oxygen isotope record, with its high-resolution detail, yields crucial information on past climate change. The glacial δ18O oscillations of the GISP2 core, with their very fast onsets, are templates of a prototype oscillation of variable duration with an amplitude of 3.9‰.
Minze Stuiver, Pieter M. Grootes
openaire +1 more source
AbstractThe GISP2 oxygen isotope record, with its high-resolution detail, yields crucial information on past climate change. The glacial δ18O oscillations of the GISP2 core, with their very fast onsets, are templates of a prototype oscillation of variable duration with an amplitude of 3.9‰.
Minze Stuiver, Pieter M. Grootes
openaire +1 more source