δ2H of water from fluid inclusions in Proterozoic halite: Evidence for a deuterium-depleted hydrosphere?

Lécuyer, Christophe; Fourel, François; Blamey, Nigel; Brand, Uwe; Fralick, Philip

doi:10.1016/j.chemgeo.2020.119583

Cited by 3 publications

(1 citation statement)

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“…[5][6][7][8][9][10][11][12] Fluid inclusion isotope data of halite deposits have been used to reconstruct the isotope history of ocean water. 13,14 When applied to vein-type deposits, fluid inclusion isotope data can be used to reconstruct basin-scale fluid flow circulation in the subsurface, which mainly finds an interest in ore geology, [15][16][17][18] petroleum geology, 19,20 and petrology. 21 Isotope analysis of fluid inclusions is not straightforward, as inclusions are only microns to hundreds of microns in size.…”

Section: Introductionmentioning

confidence: 99%

A comparison of isotope ratio mass spectrometry and cavity ring‐down spectroscopy techniques for isotope analysis of fluid inclusion water

Graaf

Vonhof

Weißbach

et al. 2020

Rapid Comm Mass Spectrometry

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Online oxygen (δ 18 O) and hydrogen (δ 2 H) isotope analysis of fluid inclusion water entrapped in minerals is widely applied in paleo-fluid studies. In the state of the art of fluid inclusion isotope research, however, there is a scarcity of reported inter-technique comparisons to account for possible analytical offsets.Along with improving analytical precisions and sample size limitations, interlaboratory comparisons can lead to a more robust application of fluid inclusion isotope records.Methods: Mineral samples-including speleothem, travertine, and vein materialwere analyzed on two newly setup systems for fluid inclusion isotope analysis to provide an inter-platform comparison. One setup uses a crusher unit connected online to a continuous-flow pyrolysis furnace and an isotope ratio mass spectrometry (IRMS) instrument. In the other setup, a crusher unit is lined up with a cavity ringdown spectroscopy (CRDS) system, and water samples are analyzed on a continuous standard water background to achieve precisions on water injections better than 0.1‰ for δ 18 O values and 0.4‰ for δ 2 H values for amounts down to 0.2 μL.Results: Fluid inclusion isotope analyses on the IRMS setup have an average 1σ reproducibility of 0.4‰ and 2.0‰ for δ 18 O and δ 2 H values, respectively. The CRDS setup has a better 1σ reproducibility (0.3‰ for δ 18 O values and 1.1‰ for δ 2 H values) and also a more rapid sample throughput (<30 min per sample). Fluid inclusion isotope analyses are reproducible at these uncertainties for water amounts down to 0.1 μL on both setups. Fluid inclusion isotope data show no systematic offsets between the setups. Conclusions:The close match in fluid inclusion isotope results between the two setups demonstrates the high accuracy of the presented continuous-flow techniques for fluid inclusion isotope analysis. Ideally, experiments such as the one presented in this study will lead to further interlaboratory comparison efforts and the selection of suitable reference materials for fluid inclusion isotopes studies.

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