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One of the most prominent negative Bouguer gravity anomalies in the Canadian shield follows the northeastern part of the Grenville front for almost 1 200 km. It is attended along its southeastern flank, within the Grenville province, by a belt of positive anomalies that are significantly more positive than the general level of the gravity field along the opposite flank, over the older Superior, Churchill, and Nain provinces. Together, the belts of negative and positive anomalies constitute a typical example of a particular kind of paired gravity anomaly that signifies the presence of collisional sutures produced by convergent plate...

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