Novel Crushing Technique for Measuring δ18O and δ2H Values of Fluid Inclusions (H2O) in Quartz Mineral Veins Using Cavity Ring-Down Spectroscopy

Fluid inclusions in mineralized fracture infillings (i.e., veins) could preserve information about subsurface fluids like temperature and salinity. The isotopic composition of water in these fluid inclusions could provide direct evidence of the provenance of these mineral-forming fluids. So far, the...

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Bibliographic Details
Published in:Geofluids 2024-01, Vol.2024
Main Authors: Akbar Aydin Oglu Huseynov, H J L van der Lubbe (Jeroen), Verdegaal-Warmerdam, S J A, Postma, Onno, Schröder, Julian, Vonhof, Hubert
Format: Article
Language:English
Subjects:
Cavity ringdown
Fluid inclusions
Hydrocarbons
Hydrogen
Isotopes
Mass spectrometry
Minerals
Quartz
Scientific imaging
Spectroscopy
Temperature
Water
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Summary:Fluid inclusions in mineralized fracture infillings (i.e., veins) could preserve information about subsurface fluids like temperature and salinity. The isotopic composition of water in these fluid inclusions could provide direct evidence of the provenance of these mineral-forming fluids. So far, the isotope compositions of fluid inclusions have been mainly derived from carbonate veins and other precipitates, like speleothems. The aim of this study is to analyse the δ18O and δ2H isotopic compositions of aqueous fluid inclusions of quartz veins using a cavity ring-down spectroscopy (CRDS) analyser in combination with a moisturized nitrogen background and mechanical crusher. For this study, we analysed δ18O and δ2H values of fluid inclusions in quartz veins from three north-western European locations formed during the Variscan orogeny. Prior to crushing, the fluid-rich quartz fraction was separated from the pure quartz fraction, from other mineral phases and host rock by using conventional heavy liquids and magnet separation. Raman spectrometry detected some rare occurrences of hydrocarbon, methane, and nitrogen in the fluid inclusions. The samples were sequentially crushed to elucidate the potential impact of different fluid inclusion assemblages (FIA) on the δ18O and δ2H values. The results from single and sequential mechanical crushing, together with interlaboratory comparisons, exhibit reliable and consistent isotopic patterns across locations with high precision (for δ18O: 1σ SD
ISSN:1468-8115
1468-8123
DOI:10.1155/2024/5795441