Abstract

Titaniferous magnetite rocks crop out along streams that enter the St. Lawrence river in the Sept-Iles area. The deposits, found in a gabbro and anorthosite complex, are somewhat similar to other titaniferous deposits in Quebec and elsewhere.The microtexture shown by the magnetite-ilmenite intergrowths is of a novel type---an en echelon arrangement of the ilmenite lamellae in the magnetite. The abnormal arrangement of the lamellae is inferred to be a result of a distortion of the magnetite between the time of crystallization and the time when the temperature of ex-solution was attained.

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