39]Ar muscovite age of 384 [+ or -] 7 Ma from the John Lee Brook Granite together with the reported presence of white microgranitic
veins cutting the adjacent Magaguadavic Granite, dated by U-Pb on zircon at 396 [+ or -] 1 Ma (Bevier 1990), suggested that the former was younger than the latter (McLeod 1990).
In the outcrops near the main road, for example, small microgranitic
dykes occur in three orientations, and were probably emplaced along a set of joints.
Grain type Frequency (%) Plagioclase feldspar mineral grains 50 quartz mineral grains 15 biotite mica flakes 12 polycrystalline-polymineralic (quartz-feldspar) microgranitic
rock fragments 10 K-feldspar mineral grains 8 opaque iron oxide grains (probably magnetite) 3 hornblende (pale green) mineral grains 2 Table 2.