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Precise U-Pb zircon ages for the Molson dyke swarm and the Fox River sill: Constraints for Early Proterozoic crustal evolution in northeastern Manitoba, Canada by L. M. Heaman; N. Machado; T. E. Krogh; W. Weber is a Earth and Planetary Sciences article available to read on EtoBox.

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Precise U-Pb zircon ages have been obtained for samples from the Molson dyke swarm and the Fox River sill in NE Manitoba, Canada. The ages determined for the Cross Lake and Cuthbert Lake dykes are 1,883.7\_+11.'7 and 1,883\_\_\_2 Ma, respectively, and are in excellent agreement with the 1,882.9 +~'5 Ma age obtained for the Fox River -1.4 sill. These results support the contention that the emplacement of the Fox River sill and the Molson Dyke swarm was contemporaneous and also demonstrate the potential for correlating marie igneous activity in widely spaced localities. The timing of Early Proterozoic marie magmatism in the western Superior Province appears to be synchronous with igneous activity in other parts of the Circum-Superior Belt and in the Trans Hudson orogen to the west. The emplacement of the Molson dyke swarm at 1,883 Ma indicates a 700 Ma interval of quiescence between the final igneous activity that is recorded in the Archean basement and dyke intrusion. The presence of deformed equivalents of Molson dykes in the Thompson Nickel Belt indicates that the intense deformation in this belt occurred sometime after 1,883 Ma.

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Author

L. M. Heaman; N. Machado; T. E. Krogh; W. Weber

Publisher

Springer; Springer-Verlag; Springer Verlag; Springer Science and Business Media LLC; Society for Mining, Metallurgy and Exploration Inc. (ISSN 0010-7999)

Published

1986

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)