The feldspars of the Rosses Granite Complex, Donegal, Ireland

1 September 1966

journal article
Published by Mineralogical Society in Mineralogical Magazine and Journal of the Mineralogical Society

Vol. 35 (275) , 975-982
https://doi.org/10.1180/minmag.1966.035.275.10

Abstract

SummaryAn examination has been made of the composition and structural state of the feldspars in each of the units of the Rosses granite complex. The compositions of the plagioclases are systematically related to the compositions of the rocks, but the alkali feldspars are much more uniform as a result of postmagmatic recrystallization. In the granites both alkali feldspar and plagioclase are in low-temperature structural states, but alkali feldspar phenocrysts from one of the porphyry dykes associated with the complex show a higher-temperature state.

Keywords

This publication has 3 references indexed in Scilit:

PETROLOGY OF SEVERAL PEGMATITES IN THE KEYSTONE DISTRICT, BLACK HILLS, SOUTH DAKOTA
GSA Bulletin, 1960
Structural mechanism of thermal and compositional transformations in silicates
Zeitschrift für Kristallographie, 1959
The Rosses granitic ring-complex, County Donegal, Eire
Proceedings of the Geologists' Association, 1953