Petrographic and Rock Magnetic Study of the Central Magnetic Anomaly, Manicouagan Impact Structure, Canada

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Alteration: Hydrothermal, Magnetic Anomaly, Manicouagan, Rock Magnetism, Shock Decomposition

Scientific paper

Drill core from a localized magnetic high in the centre of the Manicouagan impact structure reveals highly altered granulite grade rocks rich in magnetic carriers. High magnetic susceptibilities and natural remanent magnetic intensities appear to be due to the formation of magnetic minerals by both shock decomposition and hydrothermal alteration. This contrasts with other processes that produce the magnetic low observed over the majority of impact structures.

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