Nitrogen argon isotopes

The anomalous micro-composition of the Martian atmosphere with regard to nitrogen, argon, neon, krypton and xenon has also been compared with trapped gases for the Martian meteorite collection (12 in total). The isotope ratios for... 

Marty B, Humbert F (1997) Nitrogen and argon isotopes in oceanic basalts. Earth Planet Sd Lett 152 101-112... 

Richards, F. A., and Benson, B. B. (1960). Nitrogen/argon and nitrogen isotope ratios in two anaerobic environments, the Cariaco Trench in the Caribbean Sea and Dramsfjord, Norway. Deep-Sea Res. 7, 254-264. 

In Antarctica, both paleothermometry and the use of nitrogen and argon isotopes pose some problems. First, the low accumulation that prevails at East Antarctic inland sites such as Vostok... 

Van Zuilen, M.A., Mathew, K., Wopenka, B., Lepland, A., Marti, K., and Arrhenius, G., 2005. Nitrogen and argon isotopic signatures in graphite from the 3.8 Ga-old Isua supracrustal belt, southern west Greenland. Geochim. Cosmochim. Acta, 69, 1241-52. 

The interstitial air trapped during this process preserves a largely unaltered record of the composition of past atmospheres on time scales as short as decades and as long as several hundred thousand years. Such records have provided critical information about past variations in carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), carbon monoxide (CO), and the isotopic composition of some of these trace species. In addition, studies of the major elements of air nitrogen, oxygen, and argon, and their isotopic composition, have contributed... 

Nielsen SG, Rehkamper M, Brandon AD, Norman MD, Turner S, O Reilly SY (2007) Thallium isotopes in Iceland and Azores lavas - Implications for the role of altered crust and mantle geochemistry. Earth Planet Sd Lett 264 332-345 Nier AO (1950) A redetermination of the relative abundances of the isotopes of carbon, nitrogen, oxygen, argon and potassium. Phys Rev 77 789... 

Nier, A. O. (1950) A redetermination of the relative abundances of the isotopes of carbon, nitrogen, oxygen, argon, and potassium. Physical Review, 77, 793-798. 

An isotope of carbon called carbon-14 offers a glimpse of how humans may have lived thousands of years ago. The radioactive isotope decays steadily to become nitrogen-14 in a way that is similar to the decay of potassium into argon, making it useful for dating plants, bones, and other organic materials that once contained... 

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