Temagami Magnetic Anomaly

Located nearby are a number of other geological structures, including the Sudbury Basin, the Lake Wanapitei impact crater, and the Temagami Greenstone Belt.

[1] The western portion appears smoother in character while the eastern section is long and narrow.

With an areal extent of 50 x 15 km, it reaches a magnitude of approximately 10,000 nanoteslas, making it one of the largest positive anomalies in North America.

[2] The eastern section coincides with a small positive gravity anomaly, indicating the presence of dense rocks at depth.

Analysis of the lowest most rocks indicated similarities with the quartz diorite dykes found at the Sudbury Igneous Complex, which were likely created at the same time as the Sudbury impact event.

Landsat image showing the anomaly, cross is at the centre of it. Shows the terrain only, not the magnetic deviations of the area.
The Anomaly on a map, the larger pink spot near the center of the image.