<p> The northwestern Melville Peninsula in the area of
69°34'N/84°50'W consists of Precambrian Shield rocks
that have suffered multiple metamorphic events,
including a high grade metamorphic event in the late
Archean, ranging from upper amphibolite to granulite
grade locally. The oldest unit present is a
tonalite-granodiorite-granite suite showing both
foliation and lineation and a somewhat migmatic texture.
This biotite-hornblende orthogneiss has produced a Rb-Sr
whole rock age date of 2.55 +/- 0.2 Ga. Field
relationships indicate that this is a metamorphically
induced age rather than an emplacement age. A coarse
grained granitic pegmatite associated with the
orthogneiss has produced a Rb-Sr isochron indicating an
age of 1.83 +/- 0.06 Ga. Petrographic and field evidence
indicate that this represents the emplacement age of the
pegmatite. </p> / Thesis / Bachelor of Science (BSc)
| Identifer | oai:union.ndltd.org:mcmaster.ca/oai:macsphere.mcmaster.ca:11375/19549 |
| Date | 04 1900 |
| Creators | Prevec, Stephen |
| Contributors | McNutt, R.H., Geology |
| Source Sets | McMaster University |
| Language | English |
| Detected Language | English |
Page generated in 0.0164 seconds