Abstract
In situ Raman spectroscopic measurements of H<sub>2</sub>O-NaCl systems with
three different salinities (0, 5.0, and 10.0 wt% NaCl) in the region of O-H
stretching vibration were obtained at pressures up to 1800 MPa and temperatures from
298 to 453 K, with a hydrothermal diamond-anvil cell. The peak position was
determined by fitting the obtained O-H stretching band with one Gaussian component.
At a given temperature, the shift of the band decreased systematically with
increasing pressure, and the data show a good linear relationship. For systems of
different salinity, the slopes of the isotherms seem to be independent of
temperature under the conditions investigated. With increasing salinity, the slope
of the isotherm gradually increases. The relationships measured for the shift of the
O-H stretching band with temperature, salinity, and pressure can be used to
determine the internal pressure and isochore of fluid inclusions as well as the
formation temperature and pressure of host minerals.
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