Paleomagnetism of gabbros of the Early Proterozoic Blachford Lake Intrusive Suite and the Easter Island dyke, Great Slave Lake, NWT: Possible evidence for the earliest continental drift

Details Paleomagnetism of gabbros of the Early Proterozoic Blachford Lake Intrusive Suite and the Easter Island dyke, Great Slave Lake, NWT: Possible evidence for the earliest continental drift Paleomagnetism of gabbros of the Early Proterozoic Blachford Lake Intrusive Suite and the Easter Island dyke, Great Slave Lake, NWT: Possible evidence for the earliest continental drift

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984geosu...7....1i&link_type=abstract

Geophysical Surveys, Volume 7, Issue 1, pp.1-25

Physics

9

Scientific paper

The Caribou Lake gabbro, part of the Blachford Lake Intrusive Suite accurately dated at -2186±10 mA, has a predominant NW-/SE+ magnetization with a mean, irrespective of sign, of D=119°, I=50°, α95=5° and a palaeopole 14°N, 064°W, A 95=5°; it has not proved possible to determine if the magnetization is primary. The Easter Island dyke, less well-dated in the range -2200 to -2500 Ma, has a predominant WNW+ magnetization, whose mean, when corrected for an 8° tilt, is D=288°, I=46°, α95=5° and palaeopole is 32°S, 2°W, A 95=5°; the magnetization is probably primary. A vertical magnetization ( D), not significantly different from the present field, occurs sporadically in both units and is considered to be Late Phanerozoic in age. Palaeopoles from the Caribou Lake gabbro and the Easter Island dyke, together with those already known from Early Proterozoic intrusives of the Archaean Slave Structural Province, roughly define a swath (the Slave Track) which maps the motion of the Slave Province relative to the geomagnetic axis during this interval. The corresponding array of palaeopoles (the Superior Track) from the Superior Structural Province does not fall in the same place. Hence it would appear that Slave and Superior were not in their present relative positions in the Early Proterozoic in disagreement with arguments that have been made for a fixed supercontinent during much of the Proterozoic. Mid-Proterozoic paleomagnetic signatures indicate that Slave and Superior had assumed their present relative position by about -1750 mA. These Early Proterozoic relative motions are the earliest for which there is palaeomagnetic evidence.

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