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The Sulfide Ores of Sudbury: Their Particular Relationship to a Distinctive Inclusion-Bearing Facies of the Nickel Irruptive

By
B. E. Souch
B. E. Souch
Geological Staff The International Nickel Company of Canada, Limited
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T. Podolsky
T. Podolsky
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Published:
January 01, 1969

Abstract

A study of the gross aspects of the Sudbury ore deposits supplemented by certain observations concerning the structure, geochronology and petrology of the nickel irruptive has revealed intimate linkages relating the many ore types to each other and to the irruptive. The ores are the sulfide-rich portions of a discontinuous noritic "sub-layer" at the base of the irruptive, seemingly introduced as an inclusion, and sulfur-rich silicate magma. Ore mineral ratios vary unpredictably from mine to mine, but in any given ore body show a predictable zoning trend toward the footwall. No zoning related to depth alone has been recognized. Isotopic dating suggests that although the norite and sub-layer may be contemporaneous they may be older than the micropegmatite. Modal analyses of samples from traverses across the norite into the micropegmatite show both gradual and abrupt variations, and are the basis for further subdivision of the norite member. Nickel, copper, and sulfur contents in the norite member increase slightly toward its base but are an order of magnitude less than in average sub-layer rock. Displacements on two major fault systems have exposed the basal part of the irruptive including the sub-layer to borehole and surface examination over a pre-faulting vertical range that may exceed 5½ miles.

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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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