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A deep crustal seismic reflection profile across granite-greenstones of the Eastern Goldfields in the Archaean Yilgarn Craton has revealed new constraints on upper crustal geometries. The Ida Fault, which forms the western boundary of the Eastern Goldfields, is a 30° east-dipping normal fault that can be traced to a depth of about 25 km. A mid-crustal boundary is displaced with a throw of some 5...
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