Report on the Sixth and Seventh Victoria University of Wellington Antarctic Expedition 1962-63: VUWAE 6 & 7
(b) Granitic rocks
(b) Granitic rocks.
Granitic rocks include the following types:
(i) | A type with large orientated phenocrysts of orthoclase set in a finer-grained matrix, giving the granite a conspicuous foliation. |
(ii) | A type which is medium to coarse grained and homogeneous. |
The foliation in the granites is parallel to the dip of the metasediments. Orbicular granite occurs in situ near the snout of the Taylor Glacier, near a granite-metasediment contact. It forms two discontinuous bands which are parallel to the foliation of the granite and the dip of the metasediments. Orbs average about 5 inches in diameter and each is encrusted with a dark hornblendic layer. The degree of packing of the orbs varies from widely dispersed to closely packed, but not close enough to distort the fairly regular forms.