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| Othmane, Guillaume; Hull, Sharon; Fayek, Mostafa; Rouxel, Olivier; Geagea, Majdi Lahd; Kyser, T. Kurtis. |
| The hydrogen isotope system is used extensively to provide information on the genesis of minerals (e.g., source of fluids and mechanisms of precipitation). The copper isotopic system is less well understood, but has the potential to provide valuable insight on mineral precipitation, particularly supergene Cu-rich minerals. Here we present a rapid and precise method for measuring hydrogen and copper isotopes in semi-precious gem-quality turquoise (Cu(Al,Fe3 +)6(PO4)4(OH)8 · 4H2O ) by secondary ion mass spectrometry (SIMS). The suitability of standards for instrumental mass fractionation (IMF) calibration was assessed by external precision of SIMS measurements for each standard (2-4‰ for δDIMF and 0.2-0.4‰ for δ65CuIMF). IMF in turquoise was correlated with... |
| Tipo: Text |
Palavras-chave: Turquoise; SIMS; Copper isotopes; Hydrogen isotopes; Matrix effects. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00239/35008/33546.pdf |
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| Clog, Matthieu; Aubaud, Cyril; Cartigny, Pierre; Dosso, Laure. |
| In this paper, we re-investigate the isotopic composition of hydrogen in MORB and the possible effects of contamination on delta D and water content. A suite of 40 N-MORB from the Pacific-Antarctic ridge, far from any hotspot, was analyzed for chlorine content by electron microprobe and for water content and delta D with silica tubes. Cl concentrations (from 29 to 2400 ppm) indicate widespread contamination, more intense with faster spreading rates, while water contents (from 840 to 7800 ppm) are mainly controlled by igneous processes. delta D values range from -76 to -48 parts per thousand, with an average value of -61 parts per thousand. The lack of correlation between Cl content and either H2O/Ce or SD indicate that contamination has a negligible effect... |
| Tipo: Text |
Palavras-chave: Hydrogen isotopes; Mantle geochemistry; Mantle water. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00169/28045/27274.pdf |
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