The Lac Raudot complex is an Fe rich layered troctolite-anorthosite intrusion located in the Grenville province of southern Quebec. Corona textures developed between plagioclase and olivine indicate the Lac Raudot complex must have equilibrated at pressures of at least 6 to 8 kbar corresponding to depths greater than 15 km. / The crystallization sequence of the layered series is olivine, followed by plagioclase and then ulvospinel. The mineralogy and chemistry of the layered series indicate differentiation by crystal fractionation along an Fe enrichment trend with olivine compositions varying from Fo 72 at the base of the layered series to Fo 57 at the top. Plagioclase appears as a liquidus phase at an olivine composition of Fo 68, and ulvospinel at an olivine composition of Fo 64. The CMB composition is unusually Fe-rich (19-20 wt% FeO) and contains clinopyroxene but no olivine. / Model calculations indicate that a parental magma of the CMB's composition is capable of producing the layered series of the Lac Raudot intrusion if an Fe+3/Fe total ratio of 0.15 is imposed. This suggests that the parental magma of the Lac Raudot intrusion was an extreme example of the Fe-rich magmas found in Proterozoic anorthosite terranes.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.59918 |
| Date | January 1991 |
| Creators | Panneton, Gerald S. (Gerald Sylvain) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Science (Department of Geological Sciences.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001238218, proquestno: AAIMM67475, Theses scanned by UMI/ProQuest. |
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