Laser oxygen isotope analysis of silicate/oxide grain separates: Evidence for a grain size effect?

Fouillac, Anne‐Marie; Girard, Jean‐Pierre

doi:10.1016/0009-2541(96)00004-6

Cited by 41 publications

(18 citation statements)

References 22 publications

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“…9.0 ± 0.10 3 CO 2 Nd/YAG laser-ClF 3 Not given Akagi et al (1995) 8.8 ± 0.2 22 CO 2 CO 2 laser-BrF 5 , whole grain Not given Fouillac and Girard (1996) 9.51 ± 0.07 9 CO 2 CO 2 laser-BrF 5 , whole grain UWG2 = Spicuzza et al…”

Section: Resultsmentioning

confidence: 99%

Oxygen three-isotope ratios of silicate reference materials determined by direct comparison with VSMOW-oxygen

Kusakabe

Matsuhisa

2008

Geochem. J.

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3 ) plot with a slope of 0.526 ± 0.003 (standard error at 95% confidence limit), but the line for the waters (VSMOW, GISP, SLAP and MSA-6) seems to have a slightly steeper slope of 0.528 ± 0.001, although difference of the slopes is not statistically significant.Keywords: oxygen three-isotope ratios, silicate reference materials, VSMOW-SLAP normalization, terrestrial fractionation line, BrF 5 fluorination to CO 2 to compare its oxygen isotopic ratio with CO 2 that has been equilibrated with reference water of a known isotopic composition (such as VSMOW). In this comparison, the equilibrium fractionation factor α CO2-H2O comes into the calculation. Since the reported values of α CO2-H2O at 25°C range from 1.0407 to 1.0412 (Friedman and O'Neil, 1977;Chako et al., 2001), this variability causes serious uncertainty in δ18 O values of minerals relative to VSMOW, if the oxygen isotopic ratios are determined using CO 2 as an analytical gas for mass spectrometry. To avoid the ambiguity, direct comparison of O 2 liberated from reference water samples with that from minerals is preferable. In the present note, we show the results of oxygen isotopic ratios of some international reference minerals by direct comparison of oxygen isotopic ratios of VSMOW and SLAP. ANALITICAL PROCEDURESOxygen was extracted in the form of O 2 from silicate and oxide minerals using a laser fluorination system with BrF 5 as a reagent (Sharp, 1990). The laser used in our system was a CO 2 laser with a maximum power of 12W and the wavelength of 10.6 µm (Model JLC-1259, Japan Laser). The focal length was 10.2 cm and a minimum spot diameter was 100 µm. A visible, coaxial He-Ne laser (wavelength of 633 nm) was attached to locate a target. The technical details of the laser fluorination system have

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Section: Resultsmentioning

confidence: 99%

Oxygen three-isotope ratios of silicate reference materials determined by direct comparison with VSMOW-oxygen

Kusakabe

Matsuhisa

2008

Geochem. J.

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“…Sulphides were analysed for sulphur isotopes by combustion at 1200°C under oxygen atmosphere, using the method of Thode et al (1961). Quartz was analysed for oxygen isotopes using the laser-CO 2 fluorination (Fouillac and Girard, 1996). Oxygen and sulphur isotopes of alunite were analysed after their conversion into BaSO 4 precipitate, respectively after Wasserman et al (1992), and Sakai and Krouse (1971).…”

Section: Methodsmentioning

confidence: 99%

Constraints of stable isotopes on the origin of alunite from advanced argillic alteration systems in Bulgaria

Lerouge

Kunov

Fléhoc

et al. 2006

Journal of Geochemical Exploration

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“…And 2 mg of quartz and tourmaline was analyzed for oxygen isotope composition by laser-CO2 fluorination (Fouillac and Girard 1996). About 25-50 mg of tourmaline was extracted and analyzed for the hydrogen isotope geochemistry using the method of Bigeleisen et al (1952); i.e., heating at 1,200°C and reduction of water on uranium at 800°C.…”

Section: H O Isotope Geochemistrymentioning

confidence: 99%

Geochronological and geochemical characterization of magmatic-hydrothermal events within the Southern Variscan external domain (Cévennes area, France)

Chauvet

Volland-Tuduri

Lerouge

et al. 2011

Int J Earth Sci (Geol Rundsch)

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Geochronological, mineralogical, and geochemical analyses have been focussed on the Mont-Lozère-Borne plutonic complex and surrounding rocks (Cévennes, French Massif Central) in which B-W-Sn and As-Au-Sb mineralization is encountered. Two main results are highlighted: (1) the existence of a 301-306 Ma magmatohydrothermal event unrelated to the emplacement of the Pont-de-Montvert-Borne plutonic body at 316 Ma; (2) the magmatic and hydrothermal features are strongly associated, both in time and in space, thus demonstrating an intimate connection between mineralizing processes and magmatism in this part of the French Massif Central. We also show that mineralization and associated hydrothermal occurrences do not correspond to a simple and single geochemical signature and that a contamination model must be invoked in order to account for the complexity of isotopic results. This study demonstrates that the application of the O and H isotopic signatures as tracers of the source and nature of fluids in an orogenic context requires some specific care. Finally, a model of the tectonic-magmatic-hydrothermal evolution of the study area is suggested in which we discuss two alternative scenarios. The first one implies the existence of two different hydrothermal/ mineralizing events (Bo-W-Sn and As-Au-Sb ones). The second one suggests the same source for all hydrothermal and mineralized structures.

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Laser oxygen isotope analysis of silicate/oxide grain separates: Evidence for a grain size effect?

Cited by 41 publications

References 22 publications

Oxygen three-isotope ratios of silicate reference materials determined by direct comparison with VSMOW-oxygen

Oxygen three-isotope ratios of silicate reference materials determined by direct comparison with VSMOW-oxygen

Constraints of stable isotopes on the origin of alunite from advanced argillic alteration systems in Bulgaria

Geochronological and geochemical characterization of magmatic-hydrothermal events within the Southern Variscan external domain (Cévennes area, France)

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