A new approach to geobarometry by combining fluid inclusion and clumped isotope thermometry in hydrothermal carbonates
Abstract
This study presents a new approach to geobarometry by combining fluid inclusion
and clumped isotope thermometry on carbonate minerals. The offset between
homogenisation temperatures of primary fluid inclusions with known composition
and temperatures of the host mineral allows a direct estimation of the fluid
pressure at the time of carbonate crystallisation. This new approach is illustrated via
hydrothermal dolomite samples from the Variscan foreland fold-and-thrust belt in
northern Spain. Clumped isotope analyses yield crystallisation temperatures (107–
168°C) which are higher than homogenisation temperatures in corresponding sam-
ples (95–145°C). The calculated pressure values suggest that dolomitizing fluids
were overpressured during formation of zebra dolomite textures, whereas lower
pressures are obtained for dolomite cement from breccia textures. This new
approach to geobarometry opens up the possibility of estimating the pressure of
carbonate crystallisation and has potential applications in diagenesis, basin analysis,
ore geology and tectonics.
Domains
Earth Sciences
Origin : Files produced by the author(s)
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