Physics
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gecoa..41.1803h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 41, Issue 12, pp.1803-1815
Physics
3
Scientific paper
Rb---Sr ( Rb = 1.39 × 10 -11 yr -1 ) and U-Pb ( 238 = 1.54 × 10 -10 yr -1 , 235 = 9.72 × 10 -10 yr -1 ) measurements were undertaken in the Sudbury area, Sudbury, Ontario to determine the ages of the Sudbury Nickel Irruptive, Superior Province granites north of Sudbury, Sudbury Breccia and subsequent metamorphism. The Sudbury Nickel Irruptive norite whole rock Rb-Sr data yield an age of 1883 ± 136Myr (I.R. = 0.7071 ± 0.0005; all results quoted at 2 level) while the Nickel Irruptive micropegmatite Rb-Sr system has been disturbed and does not yield an isochron. A plagioclase-whole rock pair from the norite near the norite-micropegmatite transition yields an age of 1866 Myr, which when taken in conjunction with field ( and , 1968) and geochemical ( et al ., 1970, 1972) data does not support the conclusion of gibbins and McNurr (1972) that the micropegmatite is a later intrusion rather than a differentiate of the magma which produced the norite. Rb-Sr studies of the Superior Province granites north of Sudbury yield an age of 2698 ± 162 Myr (I.R. = 0.7019 ± 0.0012). U-Pb zircon studies of these granites and granitic clasts within the Sudbury Breccia yield an age of 2.71 ± 0.05 Byr and suggest the breccia granitic clasts were derived from the Superior Province granites. The granitic rocks ~150 km north of Sudbury have been undisturbed for ~ 2.6 Byr based on Rb-Sr mineral studies, whereas the granites and Sudbury Breccia within ~ 15 km of the Nickel Irruptive, as well as the Sudbury norite at the perimeter of the Irruptive have been disturbed by the Penokean Orogeny 1.7-1.75 Byr ago. The Penokean event appears to have overprinted isotopic evidence of the Sudbury impact event at least in the area studied.
Farhat J.
Hurst Richard W.
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