Hornblende-rich gabbro is melanocratic,
holocrystalline, medium to coarse grained and subporphyritic in texture (Fig.
They contain a
holocrystalline, porphyritic and fine-grained to medium-grained groundmass.
This is a pinkish coloured medium- to coarse-grained
holocrystalline rock of granitic composition (sample AN47), with a moderate hydrothermal alteration (Fig.
They are fine- to medium-grained and
holocrystalline to hypocrystalline; many are porphyritic and some display flow alignment in phenocrysts.
A single sample of fresh, medium-grained,
holocrystalline basalt from the lower flow unit of this thick (i.e., 400 m) sequence gave coincident plateau and isochron correlation ages of 201 [+ or -] 2.5 Ma, in agreement with a zircon U-Pb age of 202 [+ or -] 1 Ma for this same flow unit.
These rocks (KS-6 andamp; KS-9) are
holocrystalline porphyritic and cumulophyric in texture.
The LFU ([less than or equal to]190 to [less than or equal to]40 m) is a medium- to coarse-grained, massive, columnar jointed basalt of dominantly
holocrystalline texture with minor vitrophyre.
Petrographically, the basalts are described as containing calcic plagioclase, augite, and rarer pigeonite and bronzite, and Fe-Ti oxides, and vary from
holocrystalline to variably vitrophyric ([less than or equal to]30%).