The Pseudotachylyte of Parijs (Orange Free State), and its Relation to ‘Trap-Shotten Gneiss’ and ‘Flinty Crush-Rock’
Open Access
- 16 May 1916
- journal article
- Published by Geological Society of London in Quarterly Journal of the Geological Society
- Vol. 72 (1-4) , 198-221
- https://doi.org/10.1144/gsl.jgs.1916.072.01-04.12
Abstract
I. Introduction In the year 1913 I received from a former student of mine, Mr. P. H. S. De Wet, a consignment of rock-specimens from the neighbourhood of Parijs (O.F.S.). Among these were many pieces of a dense black rock, which, I was informed, occurs very abundantly in veins and networks in the granite. The characters of this rock seemed so remarkable that I took an early opportunity of visiting Parijs myself, in order to study the phenomena in the field. As a result of my observations, I formed the opinion that the black veins were intrusions of basic magma which had entered the granite by a process of stoping, accompanied by corrosion and solution; and a paper embodying this conclusion was communicated to the Geological Society in November 1914, an abstract of it appearing in the Proceedings of the Society for that month (No. 964). After the manuscript had left my hands, I became aware for the first time of the work of Sir Thomas Holland and his colleagues of the Geological Survey of India on the ‘trap-shotten gneiss’ of Salem, Madras, and I could not fail to be struck by the resemblance between some of the phenomena there described and those observed by me. My attention was next turned to the ‘flinty crush-rocks’ of the Cheviot Hills and other parts of Scotland, which were also at one time held to be of igneous origin. By the kindness of Dr. Flett, the late Dr. Clough, and Mr. E. B.This publication has 2 references indexed in Scilit:
- On the Relationship of the Vredefort Granite to the Witwatersrand SystemQuarterly Journal of the Geological Society, 1914
- The Cauldron-Subsidence of Glen Coe, and the Associated Igneous PhenomenaQuarterly Journal of the Geological Society, 1909