Contributions to the Petrology of Barnavave, Carlingford, I.F.S.—1. The Junction Hybrids

Abstract

This is the first of a series of contributions dealing with various aspects of the petrology of Barnavave Mountain which have not been touched upon by earlier investigators. The general relationships existing between the various rock types on Barnavave were first described by Traill in 1878, though some of the rock types had been previously dealt with by Haughton. This was followed by the now classical work of Sollas on some of the hybrids occurring on the western side of the mountain. These are at present being redescribed by Dr. G. D. Osborne in a paper which will appear shortly. More recently, the Carlingford area as a whole has been dealt with by Richey and Osborne has described the metamorphosed limestones of the region. Many of the rock types, however, have never been described in detail, if at all, and it is with these that the present contributions are concerned. The author wishes to express his thanks to Prof. W. J. Pugh, Prof. C. E. Tilley and Dr. G. D. Osborne for facilitating the work in various ways, to acknowledge a grant from the Worts fund and a Royal Society grant which defrayed the cost of two of the analyses. The field work was carried out in 1932 but unforeseen circumstances prevented the earlier working up and publication of the results.