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Geochemistry of carbonatite and alkali pyroxenite, Bancroft Terrane, Grenville Province, Ontario

Alkali-rich pyroxenite and sovitic carbonatite intruded amphibolite grade metamorphic rocks of the Bancroft terrane, Grenville province, in the Eganville-Pembroke region, Ontario, between 1090 and 1038 Ma ago. Intrusive field relationships, metastable feldspar mineralogy and oxygen isotope geothermometry indicate temperatures of emplacement above 650$ sp circ$C and locally rapid cooling rates. Clinopyroxene compositions from pyroxenites, carbonatites and fenites show identical sodium and iron enrichment trends. REE and C and O isotope ratios in carbonate dikes are typical of carbonatites. The presence in nearby carbonate metasediments of diopside- and apatite-rich skarn zones resulting from regional metamorphism explains the confused state of literature concerning the intrusive suite. Previously recognized resetting of radiogenic isotope systems may have resulted from a regional fenitization event associated with the emplacement of this suite.

Identiferoai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.59521
Date January 1989
CreatorsMungall, James E.
PublisherMcGill University
Source SetsLibrary and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada
LanguageEnglish
Detected LanguageEnglish
TypeElectronic Thesis or Dissertation
Formatapplication/pdf
CoverageMaster of Science (Department of Geological Sciences.)
RightsAll items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated.
Relationalephsysno: 001067169, proquestno: AAIMM63647, Theses scanned by UMI/ProQuest.

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