Paleomagnetism of the ~1.1Ga Coldwell Complex (Ontario, Canada): Implications for Proterozoic geomagnetic field morphology and plate velocities

We report new paleomagnetic data from the ~1108Ma intrusive Coldwell Complex (Ontario, Canada) to investigate the apparent reversal asymmetry observed in some Midcontinent Rift (MCR) rocks. The rocks of eastern and central part of the complex are reversely magnetized with a group mean direction of D=114.8°, I= -63.7° ([alpha]95=3.6°, N=30). The corresponding paleomagnetic pole at Plat=47.2°N, Plong=206.5°E (A95=4.8°) is located close to the paleomagnetic poles from nearly coeval reversely magnetized rocks of the MCR system, including the lower lava flows at Mamainse Point. The rocks of western part of the complex are normally magnetized with a group mean direction (D=298.0°, I=56.9°, [alpha]95=5.8°, N=10) that passes the reversal test with respect to the reversed group mean direction. Our results do not support the previous model in which the complex was emplaced during two periods of reversed geomagnetic field polarity separated by a period of normal polarity and hence encompasses two geomagnetic reversals. Instead, our new data indicate that the Coldwell Complex records only two polarity intervals separated by a symmetrical reversal at ~1102-1105Ma. This reversal is likely equivalent to the lowermost reversal recorded at Mamainse Point and provides further evidence that the apparent reversal asymmetry reflects a plate motion rather than a persistent nondipole field geometry. Together with a high-quality data from the ~1098Ma North Shore Volcanics, our data indicate a rapid velocity of Laurentia at ~25±4cm/yr. The fast plate motion may reflect a decreased mantle drag due to vigorous mantle indicated by widespread intraplate magmatism at ~1.1Ga. Key Points The Coldwell Complex records only a single symmetrical geomagnetic reversal The reversal asymmetry at ~1.1 Ga reflects a fast North American plate motion The fast plate motion may reflect a decreased mantle drag due to unusually vigorous mantle