Mathematics – Logic
Scientific paper
Oct 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.3961r&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 59, Issue 19, pp.3961-3975
Mathematics
Logic
3
Scientific paper
In many geologic environments, dominantly aqueous solutions contain low concentrations of CO 2 . At ambient temperature, the typical phase assemblage in fluid inclusions which trap these solutions, consists of a CO 2 -rich vapor (where P rmCO 2 P internal and an aqueous phase containing dissolved salts and CO 2 . In this study, the CO 2 detection limits (DLs) using microthermometry and Raman spectroscopy are established in terms of P CO 2 using synthetic H 2 O---CO 2 inclusions of known composition. The purpose of the microthermomeri experiments was to identify the diagnostic CO 2 phase changes and determine the quantity of CO 2 necessary to result in observable solid CO 2 melting. The results of these experiments show that an observable solid CO 2 melting event in liquid-rich aqueous inclusions requires P CO 2 45 bars at 25°C. The Raman spectroscopic detection limits were investigated using a multichannel Raman spectrometer. The CO 2 DLs were obtained by determining signal-to-noise ratios for both the upper and lower 1 -2 2 bands as a function of CO 2 pressure (5-60 bars) over a range of integration times and incident laser power. The resulting CO 2 DLs are on the order of 1 bar for the instrument used. The band splitting of the 1 -2 2 diad as a function of CO 2 pressure, converted to CO 2 density, was measured up to 500 bars at ambient temperature. The results are given in terms of the frequency separation between the upper and lower bands and are compared to results of previous studies. An analysis of the estimated errors indicates that the technique can be used to determine CO 2 densities in fluid inclusions containing a homogeneous, free CO 2 phase to a precision of approximately ± 0.02 g/cm 3 . The temperature dependence of the intensity ratio of the hot bands to the 1 -2 2 diad was measured from 270-315 K. The close agreement between the calculated and observed resultindicates that laser induced sample heating is not significant. The intensity ratio can be used to estimate the CO 2 temperature and, combined with the Raman density determination, allows calculation of the CO 2 pressure.
Bodnar Robert J.
Rosso Kevin M.
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