Porphyroblastic and Augen Gneisses in the Bartica Assemblage, British Guiana
- 17 April 1964
- journal article
- research article
- Published by Cambridge University Press (CUP) in Geological Magazine
- Vol. 101 (6), 541-547
- https://doi.org/10.1017/s0016756800050111
Abstract
Textural differences in the occurrence of microcline define augen gneisses, subhedral porphyroblastic gneisses and euhedral porphyroblastic gneisses within the Bartica Assemblage, British Guiana. The introduction of microcline is metasomatic and the nature of the porphyroblasts appears to be a reflection of tectonic control during their development.Keywords
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