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Triple oxygen and hydrogen stable isotope composition of water in Murchison carbonaceous chondrite accessed by thermogravimetry-enabled laser spectroscopy
Chemical Geology ( IF 3.6 ) Pub Date : 2024-12-09 , DOI: 10.1016/j.chemgeo.2024.122557 Erik J. Oerter, Alexandre Garenne, Miguel Cisneros, George D. Cody, Michael Singleton, Conel M. O’D. Alexander
Chemical Geology ( IF 3.6 ) Pub Date : 2024-12-09 , DOI: 10.1016/j.chemgeo.2024.122557 Erik J. Oerter, Alexandre Garenne, Miguel Cisneros, George D. Cody, Michael Singleton, Conel M. O’D. Alexander
We have developed the capability to measure 17 O/16 O in H2 O and OH− of hydrous minerals by a technique using thermogravimetric analysis coupled with isotope ratio infrared spectroscopy (TGA-IRIS) on a suite of liquid water standards, terrestrial mineral standards, multi-mineral synthetic mixtures of terrestrial samples, and Murchison carbonaceous chondrite. This 17 O/16 O analytical capability is combined with the previously developed TGA-IRIS capability of 18 O/16 O, which enables us to calculate Δ`17 O values. Additionally, we have made 2 H/1 H measurements by TGA-IRIS on the suite of materials. Analyses of 328 standard water samples sealed into silver tubes (0.25 μL, 174 VSMOW and 154 GISP) analyzed over the course of three years yielded δ18 O values by TGA-IRIS with precision of ±0.30 ‰, δ17 O of ±0.24 ‰, Δ`17 O of ±0.126 ‰, and δ2 H ± 7.5 ‰ (± 1 Std. Dev.). TGA-IRIS analyses of a suite of hydrous minerals (oxy-hydroxide, mica, serpentines, sulfide, phyllosillicates) yields similar precision. TGA-IRIS analyses of the CM2 carbonaceous chondrite Murchison resulted in δ18 O, δ17 O, Δ`17 O, and δ2 H values of the H2 O and/or OH− from its hydrous minerals. Δ`17 O values of Murchison H2 O range from 1.034 ‰ at 350 °C, to −0.368 ‰ at 650 °C, to −1.75 ‰ at 850 °C. TGA-IRIS can generate Δ`17 O values of H2 O and/or OH− in hydrous materials that are well within the precision needed for the analysis of meteoritic samples, as well as samples returned from asteroids, such as Ryugu and Bennu.
更新日期：2024-12-09
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