Paleomagnetism of the Deadman's Bay diabase dikes from northeastern central Newfoundland
Twenty-six oriented samples were collected from six diabase dikes cutting the Deadman's Bay granite of northeastern central Newfoundland for the purpose of paleomagnetic investigations. The dikes probably form part of a general swarm of diabase dikes in this area of Devonian age (40Ar/39Ar age of 370 ± 10 Ma). Stepwise thermal demagnetization of individual specimens followed by vector subtraction based on Zijderveld plots revealed two characteristic magnetizations: one, a poorly grouped magnetization of , Ī = 78.0°, α95 = 17.4°, κ = 16 carried by multidomain magnetite; and a better grouped magnetization of , Ī = 4.0°, α95 = 10.0°, κ = 42 residing in hematite. A baked contact test of the host rock (Deadman's Bay granite) intruded by the diabase dikes revealed a steep well grouped magnetization, which is not dissimilar to that carried by magnetite in the dikes. The magnetization of the host rock seems to be well grouped irrespective of distance away from the dike, thus making the contact test inconclusive. ...