<p> Lead isotope ratios have been determined by a VG.354 thermal
ionization mass spectrometer on Sudbury Igneous Complex
sulphide ores. The isotopic ratios are contrasted with the
lead isotope profile of selected country rocks in the
vicinity of the complex. South Range data form a linear
array whose slope indicates an age of approximately 1.85 Ga,
the published age of the igneous complex. They also indicate North Range data a magmatic origin for lead in the ore. North Range data describe a parallel isochron, with lower 206Pb/204Pb and 207Pb/204Pb ratios. The South and North Range data are similar to the lead-isotope composition of country rocks close to them, and indicate rather different crustal-source rocks for sulphide ores in these regions of the complex. This fact suggests that the Sudbury Igneous Complex was generated by a meteorite impact which occurred at the edge of the Huronian succession overlying the Southeast edge of the Superior Province. </p> / Thesis / Master of Science (MSc)
| Identifer | oai:union.ndltd.org:mcmaster.ca/oai:macsphere.mcmaster.ca:11375/19582 |
| Date | 08 1900 |
| Creators | Artan, Mustafa |
| Contributors | Dickin, A. P., Geology |
| Source Sets | McMaster University |
| Language | English |
| Detected Language | English |
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