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Apatite in the Kensington and Sainte-Véronique plutons, near Mont- Laurier, Québec : an indicator of magmatic and hydrothermal processes

Authors
Publisher
McGill University
Publication Date
Keywords
  • Geology.
  • Mineralogy.
Disciplines
  • Chemistry
  • Earth Science
  • Geography

Abstract

Apatite is an early crystallizing phase in Proterozoic potassic alkaline and shoshonitic magmas, and is used here to model and further the understanding of the source regions, and magmatic and hydrothermal processes of 1.08 Ga potassic plutons in the southwestern Grenville Province, Mont-Laurier area, Quebec. Apatite chemistry and $ sp{87}$Sr/$ sp{86}$Sr ratios were documented in the shoshonitic and potassic alkaline intrusive facies of the Kensington pluton, and in the potassic alkaline series of the Sainte-Veronique pluton; the two plutons are separated by 70 km. Potassic magmas in the belt were derived from separate, although similar mantle regions, while the shoshonitic series may have been derived from a distinct region, or modified by contamination. Assimilation is consistent with zoning patterns in apatite from the Kensington shoshonitic syenite. Inclusion mineralogy at Sainte-Veronique is evidence of saturation of an immiscible sulfide liquid, which may be an intrinsic characteristic of potassic alkaline magmas in the Grenville Province.

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