dc.contributor.advisor | Mitchell, Roger H. | |
dc.contributor.author | Mulja, Thomas | |
dc.date.accessioned | 2017-06-05T19:24:35Z | |
dc.date.available | 2017-06-05T19:24:35Z | |
dc.date.created | 1989 | |
dc.date.issued | 1989 | |
dc.identifier.uri | http://knowledgecommons.lakeheadu.ca/handle/2453/1766 | |
dc.description.abstract | PGE-bearing Geordie Lake intrusion is located in the north-central region of the Coldwell comples near the town of Marathon. | |
dc.description.abstract | The Geordie Lake Intrusion (GLI) consists of alternating zones of
layering-free troctolite and olivine gabbro outcropping in the north-central
part of the Coldwell alkaline complex, northwestern Ontario. The troctolite
exhibits harrisitic texture in which dendritic olivine (F044-56), plagioclase
(An48-57), and skeletal magnetite are the main constituents. Small amounts
of clinopyroxene (Di36Hd60Ae4-Di30Hd66Ae4) are present in the troctolite.
The ophitic olivine gabbro consists of clinopyroxene (Di4iHd54Ae5
Di29Hd66Ae5), plagioclase (An46-54), altered olivine, and skeletal
magnetite. Some gabbros contain high-alumina clinopyroxenes
(Ti-Px4CATS48Ae48-Ti-PxgCATS42Ae5o). Mineral chemistry and
whole-rock geochemistry indicate that the troctolite and gabbro are not
related by differentiation and their parent magma is a relatively evolved
low-alumina tholeiite. The GLI is characterized by high Sr, Rb, Ba, Th, Ta and
light rare-earth element (LREE) content but low in Ni and Cr content.
Europium anomalies are absent. Fe-Ti oxide geothermometry and
geobarometry of the troctolite and olivine gabbro give an average
equilibration temperature of 603° ± 35°C and oxygen fugacity of bar.
Disseminated chalcopyrite is the dominant style of Cu-sulphide
mineralization in the GLI. Massive chalcopyrite aggregates are rare. | |
dc.language.iso | en_US | |
dc.subject | Geology Ontario Geordie Lake Region | |
dc.subject | Geology Ontario, Northwestern | |
dc.subject | Mineralogy Ontario Geordie Lake Region | |
dc.title | Petrology, geochemistry, sulphide and platinum-group element mineralization of the Geordie Lake intrusion, Coldwell Complex, Ontario | |
dc.type | Thesis | |
etd.degree.name | Master of Science | |
etd.degree.level | Master | |
etd.degree.discipline | Geology | |
etd.degree.grantor | Lakehead University | |