Paleomagnetic results from two hydrothermally altered units in the superior province

Two problems of Precambrian palcomagnctism, namely the scarcity of well-dated palcopolcs for this geological era, and the aggravating effects of retrograde hydrothermal alteration on the rocks from which the scanty palcomagnetic record available derives, arc evaluated by the study of two specific test-cases in the northcentral and northwestern Superior Province. The fonnations studied arc: the unaltered granitic batholiths and hydrothermally altered supracrustal units of the Archean Red Lake Grcenstone Belt (northwestern Ontario), a major gold-producing region: and the Kcwccnawan-agc carbonatites and Archean anorthositcs of the Kapuskasing Structural Zone (KSZ, northcentral Ontario), an early Proterozoic belt that has been hypothesized as a cross-section of the continental crust…Ph.D