Other
Scientific paper
Jan 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55..169s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 55, Issue 1, pp.169-177
Other
1
Scientific paper
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) H 2 O (2) H 2 O + CO 2 , and (3) CH 2 ± N 2 ± CO 2 . The aqueous fluids have salinities which range from 0 to 50 eq. wt% NaCl + CaCl 2 . 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 CO 2 may be orthomagmatic; however, most of it probably came from decarbonation of calcareous, and possibly carbonaceous, lithologies. CH 4 and N 2 were generated in pelitic units during thermal metamorphism, CH 4 from reactions involving bitumen and graphite, and N 2 from NH 2 + in silicate minerals and possibly from bitumen. The restriction of high mole fractions of CH 4 and N 2 to water-free fluid inclusions can be explained by fluid immiscibility within the fracture system. The partitioning of CO 2 between water-poor and water-rich fluids was less extreme, and, in some cases, CO 2 and H 2 O may have been completely miscible.
Samson Iain M.
Williams-Jones Anthony E.
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