Trace-element and Nd isotopic variations in early Proterozoic dyke swarms emplaced in the vicinity of the Kapuskasing structural zone: enriched mantle or assimilation and fractional crystallization (AFC) process?

M. Boily, J. N. Ludden

Research output: Contribution to journalArticle

Abstract

Several Early Proterozoic Hearst-Matachewan (2.454 Ga), Kapuskasing (2.14 Ga), and Preissac (2.04 Ga) dykes were emplaced within the Archean crust surrounding the Kapuskasing structural zone (KSZ). The dykes are composed of moderately to highly fractionated tholeiitic basalts that exhibit trace-element characteristics similar to those of intraplate basaltic magmas or ocean-island basalts. Their initial Nd isotopic compositions display a range of depleted (εNd i = +2.9) to enriched (εNdi = -2.0) values that are negatively correlated with the degree of light rare-earth element enrichment. Two models for the origin of these dykes are evaluated. -from Authors

Original languageEnglish
Pages (from-to)26-36
Number of pages11
JournalCanadian Journal of Earth Sciences
Volume28
Issue number1
DOIs
Publication statusPublished - 1991

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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