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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.