Mapping and prospecting have identified outcropping Nickel Mountain-type leucocratic
gabbros at 'K9' (Click here to View Map).
These are biotite-amphibole, biotite granites, granodiorites (Ob, Novosibirsk massifs) and biotite, biotite-muscovite leucocratic
granites (Kolyvan, Barlak massifs).
The present study considered samples from igneous and metamorphic rocks and their weathering products in outcrops near the towns of A Coruna (NW Spain) and Braga (NW Portugal), which were based on the available geological mapping (IGME [14, 15]; Ferreira et al., ), and our field studies can be described as gabbro (3 samples in A Coruna), leucocratic
body in gabbro (1 sample in A Coruna), biotite-rich granites (4 samples in Braga), leucocratic
granite (3 samples in A Coruna and 5 samples in Braga), and Silurian siliciclastic metamorphic rocks (7 samples in Braga).
It characteristically takes the form of a medium-grained, granoblastic, light grey, or pink leucocratic
rock (Figure 3(h)).
The syenites are commonly nepheline syenites, and are leucocratic
, medium to coarse grained, and form large plutons.
1): Bocabec Gabbro--greyish green, locally layered, medium-grained gabbro and minor associated granitic rocks; Utopia Granite--typically red, leucocratic
, medium--to coarse-grained, equigranular, biotite granite; Welsford, Jake Lee Mountain, and Parks Brook granites--beige to pink, mediumgrained and equigranular to fine-grained and porphyritic, amphibole-bearing, peralkaline granites; Magaguadavic Granite--greyish pink, coarse-grained, megacrystic granite; John Lee Brook Granite--light grey, medium-grained, equigranular, garnetiferous, two-mica granite; and Mount Douglas Granite--light pink, medium-to-coarse-grained and equigranular to fine-grained and porphyritic, rapakivitextured, biotite granite.
Some look like the host rocks, except for finer grain size, and many are leucocratic
. Perthite, albite, quartz, and sparse microcline are accompanied by small quantities of opaque oxide, with or without biotite, titanite and secondary minerals (Fig.
Pegmatitic and fine-grained leucocratic
bodies of variable size are frequent and usually showing sharp contacts with the Main Unit.
The rock exposures occur as highly denuded hills of essentially fine-medium textures with closely spaced alternating bands of leucocratic
and melanocratic minerals.
The Kagi Metamorphics are composed of leucocratic
felsic chlorite-muscovite -quartz-feldspar schist (low grade greenschist facies), some garnet-mica schist and minor metabasite (Department of Mineral Resources, unpublished).