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- W2034564317 abstract "Contact metamorphism and metasomatism of a sequence of Cambro-Ordovician pelitic, calcareous, and psammitic metasediments in the thermal aureole of the Devonian McGerrigle pluton has resulted in the generation of a wide variety of fluid compositions which can be described by the system C-O-H-N-salt. Microthermometric and Raman spectroscopic data on fluid inclusions trapped in quartzsulfide veins adjacent to the intrusive contact indicate that three fluid types existed in the aureole: (1) H2O (2) H2O + CO2, and (3) CH2 ± N2 ± CO2. The aqueous fluids have salinities which range from 0 to 50 eq. wt% NaCl + CaCl2. This range in fluid compositions resulted from the progressive devolatilization of a variety of lithologies and the release of waters from the intrusion. The range in salinity of the aqueous fluids is attributed to variable contributions of high salinity waters from the intrusions and lower salinity dehydration and formation waters. Some of the CO2 may be orthomagmatic; however, most of it probably came from decarbonation of calcareous, and possibly carbonaceous, lithologies. CH4 and N2 were generated in pelitic units during thermal metamorphism, CH4 from reactions involving bitumen and graphite, and N2 from NH2+ in silicate minerals and possibly from bitumen. The restriction of high mole fractions of CH4 and N2 to water-free fluid inclusions can be explained by fluid immiscibility within the fracture system. The partitioning of CO2 between water-poor and water-rich fluids was less extreme, and, in some cases, CO2 and H2O may have been completely miscible." @default.
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- W2034564317 date "1991-01-01" @default.
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- W2034564317 title "C-O-H-N-salt fluids associated with contact metamorphism, McGerrigle Mountains, Quebec: A Raman spectroscopic study" @default.
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- W2034564317 doi "https://doi.org/10.1016/0016-7037(91)90409-x" @default.
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