Origin and diagenesis of the manetoe facies, southern Yukon and Northwest Territories, Canada. ...

• Main Author: Aulstead, Kathy Loree
• Format: Master Thesis
• Language: English
• Published: University of Calgary 1987
• Subjects: QE 665 A86 1988; Geology, Stratigraphic - Devonian; Diagenesis - Yukon Territory, Southern; Diagenesis - Northwest Territories; Facies Geology - Yukon Territory, Southern; Facies Geology - Northwest Territories; Mackenzie Shelf; Northwest Territories; Yukon
• Online Access: https://dx.doi.org/10.11575/prism/13920; https://prism.ucalgary.ca/handle/1880/23579

Bibliography: p. 132-142. ... : The Manetoe Facies is a diagenetic feature developed in Lower and Middle Devonian carbonates of the Mackenzie Shelf. The Manetoe Facies is of economic importance in that it forms the reservoir rock for three gas fields and contains lead-zinc mineralization similar in nature to Mississippi Valley-type deposits. The paragenetic sequence of cements is: white sparry dolomite, bitumen, fluorite, anhydrite, barite, calcite, quartz, sphalerite and galena. Dolomite of the Manetoe Facies formed prior to the end of the Devonian in a hydrothermal system. Lateral relations in outcrop indicate that the formation of dolomite cement was contemporaneous with dolomitization of surrounding strata. Fluid inclusion data indicate dolomite cements formed from hot (150-210 °C), hypersaline (18-29 eq. wt. % NaCl) brines. This agrees well with s 10 0 of the dolomite cements (-9 to -16 °/oo PDB), yielding an initial water composition of +3 to +10 °/oo SMOW. Results of experimental stretching of fluid inclusions in dolomite imply that ...