Oxygen Isotopes - University of Texas at Austin
Isotope Geochemistry Isotopes are forms of a chemical element that have the same atomic number but differ in mass Oxygen is made up of two isotopes: Oxygen - 16 (also known as 16O 8 protons + 8 neutrons; a “light” oxygen); The relative amounts are expressed as either 18O/16O or δ18O
Oxygen Isotopes, Milankovitch, and Climate
Below is an annotated version of the Lisiecki and Raymo (2005) composite benthic foram oxygen isotope curve shown above (p 1) Note the temporal changes in amplitude and frequency displayed in these data In this record, glaciation was initially orbitally-forced by obliquity, but later changed to eccentricity
Oxygen Isotopes: measuring temperature and ice volume
When using δ18O values, rather than 18O/16O ratios, the appropriate equations to calculate the oxygen isotope value of the remaining vapor or the rain that would condense from it are: For vapor: δ18O vapor remaining = (δ 18O Vo + 1000)f (α-1)-1000 For rain: δ18O rain = α(δ 18O vapor remaining + 1000) -1000 DO IT YOURSELF Below, assume
Tracing Ground-water Movement By Using the Stable Isotopes Of
The stable isotope technique involves measurement of the isotopic species oxygen-16 (H2160), oxygen-18 (H2180), and deuterium (HD160) in a water sample The hydrogen isotopic ratio, D/H, is determined from HD160 and H2160, and the oxygen isotopic ratio, 180/160, is determined from H2180 and H2160 Vari
Oxygen Isotopes in Zircon - UW–Madison
Oxygen isotope ratio of zircon, baddeleyite, and garnet standards analyzed by laser fluorination at the Univer-sity of Wisconsin Standard δ18O ± 1SD N age U HfO 2 Refs Comments ‰ SMOW Ma ppm wt ZIRCON Aber 5 05 0 05 3 0 75 3 USNM #83829, Abercrombie R , NSW, Australia BR231 9 81 0 04 3 571 772 1 30 4, 9 1 8g xt
Oxygen isotope fractionation in the CaCO3-DIC-H2O system
The oxygen isotope ratio (d18O) of inorganic and biogenic carbonates is widely used to reconstruct past environments However, the oxygen isotope exchange between CaCO 3 and H 2O rarely reaches equilibrium and kinetic isotope effects (KIE) commonly complicate paleoclimate reconstructions We present a comprehensive model of kinetic and
Oxygen isotope fractionation during N O production by soil
9 isotope oxygen fractionation However, two studies that conducted parallel 18O traced and 10 natural abundance experiments allowed formulating general oxygen isotope fractionation 11 models (Rohe et al , 2014a; Snider et al , 2013) These models showed that the magnitude of
FEATURE ARTICLES HYDROGEN AND OXYGEN STABLE ISOTOPE RATIOS OF
Hydrogen and oxygen stable isotope ratios, particu-larly the latter, provide a robust tool for origin determination • Dolomite-related nephrites from Vitim, Chuncheon, Xinjiang, and Qinghai differ from one another by dis-tinct hydro gen and oxygen stable isotope ratios • Differences in hydrogen and oxygen stable isotope
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