Overview of Results from the Greenstone ... - Geology Ontario

03BHA-0345 Felsic lapilli tuff, Genex Mine, central Godfrey Township
(NAD83, Zone 17 UTM 458483E, 5369414N; #6 on Figure 2 and Table 1)
A sample of crystal-rich felsic lapilli tuff was collected from an outcrop approximately 800 m southsouthwest
of the Genex Mine. This sample yielded an abundant population of relatively large, colourless
to pale yellow-brown, water-clear, sharply prismatic or euhedral zircon grains. Best quality grains are
dominated by short, stubby or equant forms, though subordinate populations having slightly more
elongate, or flat, prismatic morphologies are also present. Rod and bubble inclusions are common in
many zircons, but were avoided in the final grains chosen for analysis.
Data for three abraded single-grain fractions of colourless to pale yellow, clear, stubby to equant
zircons overlap completely, clustering tightly on or slightly above concordia (