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Geochemistry of Some Canadian Nickeliferous Ultrabasic Intrusions

By
H. D. B. Wilson
H. D. B. Wilson
University of Manitoba, Winnipeg, Manitoba, and Falconbridge Nickel Mines, Ltd., Toronto, Ontario
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L. C. Kilburn
L. C. Kilburn
University of Manitoba, Winnipeg, Manitoba, and Falconbridge Nickel Mines, Ltd., Toronto, Ontario
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A. R. Graham
A. R. Graham
University of Manitoba, Winnipeg, Manitoba, and Falconbridge Nickel Mines, Ltd., Toronto, Ontario
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K. Ramlal
K. Ramlal
University of Manitoba, Winnipeg, Manitoba, and Falconbridge Nickel Mines, Ltd., Toronto, Ontario
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Published:
January 01, 1969

Abstract

The Katiniq ultrabasic sill was intruded as a liquid-crystal mixture. Cumulus silicate minerals accumulated at the center of a flow system. More dense cumulus sulfide liquid accumulated near the bottom of the sill and collected in riffle-shaped traps to form ore bodies.

The igneous series in the Cape Smith-Wakeham Bay belt of the Ungava peninsula rose through the crust along the boundary between the Churchill and Superior structural provinces of the Canadian shield. The composition of the series is contrasted with other magma series.

The ultrabasic rocks in the Bucko and Bowden deposits of the Manitoba (Thompson) nickel belt were intruded as a crystal mush with a much lower liquid content than that of the Katiniq sill. Silicate and sulfide phases show little evidence of gravity settling. Post-ultrabasic granitic intrusions cause extensive metasomatism of major elements but ore elements are not materially affected.

The McWatters, Ontario deposit, in a volcanic environment was intruded as a liquid-crystal mush with enough liquid to allow segregation of cumulus olivine toward the center of a dike flow-system, and gravity settling of cumulus sulfide liquid.

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Contents

Society of Exploration Geophysicists Geophysical Monograph Series

Magmatic Ore Deposits

H. D. B. Wilson
H. D. B. Wilson
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Society of Economic Geologists
Volume
4
ISBN electronic:
9781934969991
Publication date:
January 01, 1969

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