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Experimental diffusion of hydrogen into synthetic fluid inclusions in quartz
Author(s) -
HALL D. L.,
STERNER S. M.
Publication year - 1995
Publication title -
journal of metamorphic geology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.639
H-Index - 114
eISSN - 1525-1314
pISSN - 0263-4929
DOI - 10.1111/j.1525-1314.1995.tb00224.x
Subject(s) - fluid inclusions , metamorphic rock , inclusion (mineral) , quartz , hydrogen , diffusion , mineralogy , geology , raman spectroscopy , analytical chemistry (journal) , thermodynamics , geochemistry , chemistry , chromatography , paleontology , physics , organic chemistry , optics
Quartz‐hosted, synthetic CO 2 ‐H 2 O fluid inclusions behave as open systems with respect to diffusional transfer of hydrogen during laboratory‐simulated metamorphic re‐equilibration at 650, 750 and 825°C and 1.5 kbar total pressure with f O2 defined by the C‐CH 4 buffer. Microthermometry and Raman spectroscopy show that the initial CO 2 ‐H 2 O inclusions become CO 2 ‐CH 4 ‐H 2 ‐H 2O inclusions after diffusive influx of hydrogen from the reducing confining medium. Measurable changes are observed in inclusion compositions after only 15 days of re‐equilibration, implying significant hydrogen mobility at still lower temperatures over geological time spans. Results of synthetic inclusion re‐equilibrium experiments have profound implications for the interpretation of natural fluid‐inclusion data; failure to account for potential hydrogen migration in inclusions from high‐temperature geological environments may lead to erroneous estimates of P‐T, and/or the compositions of metamorphic fluids.