Abstract
The Maybrun Mines property, Kenora District, Ontario, is underlain largely by Keewatin-type metavolcanics that are transected by igneous rocks. Belts of metasedimentary rocks are very minor in extent. The igneous rock types that underlie the porperty consist of granodiorite, aplite, and leucogranite, and these are accompanied by metamorphic amphibolites derived from (1) metasedimentary high-rank graywacke and volcanic tuff, (2) extrusive meta-andesitic lavas, some of which contain pillows, and (3) intrusive gabbro, diorite, and dacite porphyry. The meta-andesite is characterized by pillow structures and spots which are saussuritized plagioclase phenocrysts. The chilled borders of the pillows and the intrastratification of the meta-andesitic lavas and metasedimentary strata suggest a marine environment of deposition of the pillowed lavas.
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