The Pseudotachylyte of Parijs (Orange Free State), and its Relation to ‘Trap-Shotten Gneiss’ and ‘Flinty Crush-Rock’
The Pseudotachylyte of Parijs (Orange Free State), and its Relation to ‘Trap-Shotten Gneiss’ and ‘Flinty Crush-Rock’
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帕里斯（橙色自由州）的伪太极岩及其与“圈射片麻岩”和“燧石碎岩”的关系
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S. J. Shand
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作者：
S. J. Shand
I. 1913年，我从我以前的一个学生那里收到了一封信，P。S. De Wet，一批来自Parijs（O.F.S.）附近的岩石标本。其中有许多块致密的黑色岩石，我被告知，在花岗岩的脉和网络中出现得非常丰富。这块岩石的特征似乎如此引人注目，以至于我很早就有机会亲自访问Parijs，为了研究现场的现象。根据我的观察，我认为黑色矿脉是基性岩浆的侵入体，这些岩浆是通过一个充填过程进入花岗岩的，伴随着腐蚀和溶解; 1914年11月，一篇体现这一结论的论文被提交给了地质学会，该论文的摘要出现在该月的《学会会刊》（第964期）上。在手稿离开我的手之后，我第一次意识到印度地质调查局的托马斯霍兰德爵士和他的同事们在马德拉斯塞勒姆的“陷阱-喷成片麻岩”上的工作，书中所描述的一些现象与我所观察到的现象之间的相似之处，使我不能不感到震惊。我的注意力接着转向了“坚硬的挤压"--谢维奥山和苏格兰其他地区的岩石，也曾一度被认为是火成岩的起源。感谢弗利特医生，已故的克拉夫医生和E先生的好意。B。
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.