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• W2018209051 abstract "Fluid inclusions in tourmaline and quartz from the footwall contact of the Tanco granitic pegmatite, S.E. Manitoba were studied using microthermometry (MT), laser Raman spectroscopy (LRS) and gas chromatography (GC). CH4-bearing, aqueous inclusions occur in metasomatic tourmaline of the footwall amphibolite contact. The internal pressures estimated from MT are lower than those obtained from LRS (mean difference = 54 ± 19 bars). The difference is probably due to errors in the measurement of Th CH4 (V) and to the presence of clathrate at Th CH4 (V) into which CO2 had been preferentially partitioned. LRS estimates of pressure (125–184 bars) are believed to be more accurate. Aqueous phase salinities based on LRS estimates of pressure are higher than those derived using the data from MT: 10–20 eq. wt% NaCl. The composition of the inclusions determined by GC bulk analysis is 97.3 mol% H2O, 2.2 mol% CH4, 0.4 mol% CO2, 250 ppm C2H6, 130 ppm N2, 33 ppm C3H8, 11 ppm C2H4, and 3 ppm C3H6, plus trace amounts of C4 hydrocarbons. The composition is broadly similar to that calculated from MT (92% H2O and 8% CH4, with 7 eq. wt% NaCl dissolved in the aqueous phase and 2 mol% CO2 dissolved in the CH4 phase), as expected due to the dominance of a single generation of inclusions in the tourmaline. However, two important differences in composition are: (i) the CH4 to CO2 ratio of this fluid determined by GC is 5.33, which is significantly lower than that indicated by MT (49.0); and (ii) the H2O content estimated from MT is 92 mol% compared to 98 mol% from GC. GC analyses may have been contaminated by the presence of secondary inclusions in the tourmaline. However, the rarity of the latter suggests that they cannot be completely responsible for the discrepancy. The differences may be accounted for by the presence of clathrate during measurement of Th CH4 (critical), which would reduce CO2 relative to CH4 in the residual fluid, and by errors in visually estimating vol% H2O. The compositions of the primary inclusions in tourmaline are unlike any of those found within the pegmatite and indicate that the fluid was externally derived, probably of metamorphic origin. Inclusions in quartz of the border unit of the pegmatite are secondary and are either aqueous (18 to 30 eq. wt% CaCl2; Th total = 184 ± 14°C) or carbonic. Tm CO2 for the carbonic inclusions ranges from −57.5 to −65.4°C and is positively correlated with Th CO2. Analyses of XCH4 based on LRS agree within 5 mol% of those derived from MT and together indicate a range of compositions from 5 to 50 mol% CH4 in the CO2 phase. Bulk analysis by GC gives 99.0 mol% H2O, 0.6 mol% CO2, 0.4 mol% CH4, 160 ppm N2, 7 ppm C2H6, 4 ppm C3H8, and 2 ppm C2H4, with trace amounts of COS (carbonyl sulphide) and C3H6. The level of H2O in the analysis is consistent with the dominance of the aqueous inclusions in these samples, and the CH4:CO2 ratios are consistent with estimates from MT and LRS. The preservation of variable ratios of CH4:CO2 in inclusions < 50 μm apart indicates that neither H2 diffusion out of the inclusions nor reduction of fluids leaving the pegmatite were responsible for the more oxidized chemistries of the border unit inclusions relative to those in the tourmaline of the metasomatised amphibolite. The compositions of the inclusions in the quartz lie between those of the fluid trapped by the tourmaline (externally derived) and the measured composition of a CO2-bearing pegmatitic fluid, which indicates that the secondary fluids trapped in the border unit quartz were produced by late mixing." @default.
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• W2018209051 date "1990-03-01" @default.
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• W2018209051 title "H2OCH4NaClCO2 inclusions from the footwall contact of the Tanco granitic pegmatite: Estimates of internal pressure and composition from microthermometry, laser Raman spectroscopy, and gas chromatography" @default.
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• W2018209051 doi "https://doi.org/10.1016/0016-7037(90)90353-m" @default.
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