Date of Award
Civil and Environmental Engineering
Samson, Iain M.,
CC BY-NC-ND 4.0
Three stages of hydrothermal alteration have been identified at Wawa: (1) an early, pre- to syn-deformation alteration, represented by quartz-chlorite-Fe-dolomite-muscovite schists and chlorite-Fe-dolomite $\pm$ biotite schists (developed in felsic and mafic protoliths, respectively); (2) fenitization (biotite and riebeckite alteration) related to carbonatite-lamprophyre intrusives; and (3) late, fracture-related ankeritic and nematitic alteration. Events 1 and 3 are related to vein sets 1 and 3, respectively. Three generations of fluids have been recognized from fluid inclusion studies. The first fluid is an immiscible mixture of (1) high-salinity (18-23 wt. % NaCl), aqueous fluids, (2) low-salinity (4 to 7 wt. % NaCl), aqueous-carbonic fluids (XCO$\sb2\leq$ 20), and (3) CO$\sb2$-CH$\sb4$-N$\sb2$ fluids. This fluid is restricted to vein set 1 in the Surluga Mine and may have caused the early alteration in the Jubilee shear zone. The second fluid is a low- to moderate-salinity (5 to 16 Wt. % NaCl), aqueous fluid which may contain up to 10 mole % CO$\sb2$. The third fluid is a low-salinity (2 to 10 equiv. Wt. % NaCl) aqueous-carbonic fluid with significant amounts of CO$\sb2$ (XCO$\sb2$ = 0.23-0.35). (Abstract shortened by UMI.)Dept. of Geology and Geological Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1992 .B383. Source: Masters Abstracts International, Volume: 31-03, page: 1171. Supervisor: Iain M. Samson. Thesis (M.Sc.)--University of Windsor (Canada), 1992.
Bas, Bulent., "Hydrothermal alteration and fluid inclusion geochemistry of auriferous deformation zones and vein systems, S.W. Michipicoten greenstone belt, Ontario." (1992). Electronic Theses and Dissertations. 2343.