Abstract:

SUMMARY: Scattered, but stable NRM (natural remanent magnetization) in the Jersey diorite-metagabbro complex, probably acquired during the formation of the complex, can be ascribed to 2 main geological processes: (i) stoping of the late Precambrian or early Cambrian diorites and metagabbros by the Jersey granites, which caused pre-stoping NRM to be dispersed by block rotation and subsidence in the granite melt; this was the largest contributor to palaeomagnetic.scatter; (ii) hybridization of the parent gabbro during granite intrusion, which added a dioritic generation of magnetite and its NRM to the NRM carried by the gabbro, and probably also caused variable, partial remagnetization of the gabbroic NRM before stoping.

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