Journal
JOURNAL OF GEOCHEMICAL EXPLORATION
Volume 171, Issue -, Pages 20-28Publisher
ELSEVIER
DOI: 10.1016/j.gexplo.2015.12.003
Keywords
Fluid inclusion; Methane density; Raman shifts; Unified equation; Pb-Zn deposit
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Raman shift of the C-H symmetric stretching band (v(1)) of methane can be used to calculate the pressure and density of methane in fluid inclusions. However, previous numerical functions for Raman band shifts and methane density are only suitable for methane with densities lower than 03 g/cm(3). In this study, Raman shifts for pure CH4 were systematically measured at 25 degrees C and pressures up to 150 MPa. Parameters of the long range attractive forces were fitted, and Raman shifts of CH4 were calculated with hard sphere model for density up to 0.55 g/cm(3). Based on experimental data and theoretical calculation, a unified equation was established to calculate the density of methane gas from Raman,shifts over a wide density ranges up to 0.55 g/cm(3): D = v(d) - v(o) = 211.3 rho(4) -73.238 rho(3) + 24.477 rho(2) -29.0632 rho where p represents the density of methane in g/cm(3); D(cm(-1)) is the difference between the measured peak position of methane in the fluid inclusion (v(d)) and the known peak position of methane at quite low density (v(0)). The equation will work regardless of which machine the measurements of Raman shifts are done on, as long as the user knows or finds the zero-density peak position. (C) 2015 Elsevier B.V. All rights reserved.
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