New Lamprophyres and Monchiquites from Jersey

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Abstract
I. Introduction That mica-lamprophyres exhibit certain abnormalities has been recognized by most petrologists. According to Sir Jethro Teall (1888, p. 350), they do not fall readily into any scheme of classification; a similar difficulty is felt by Dr. A. Harker (1909, p. 150), while Dr. N. L. Bowen (1928b, p. 259) considers it necessary to advance a theory involving special conditions of intrusion for these rocks. On previous occasions I have made attempts to collect information with the object of throwing some light on the subject, but the resulting tentative suggestions did not bring a solution of the problem much nearer. It was, therefore, with much pleasure that I learned from Dr. A. E. Mourant that he had, in the course of his survey of the island of Jersey, found several unrecorded lamprophyres. An invitation from him resulted in a visit to the island in the summer of 1934, and this paper sets forth some of the results then obtained. An earlier paper dealt with the known lamprophyres of Jersey (Smith, 1933), the work being based on that of C. Noury and Dr. G. H. Plymen. In the present communication only the “new” lamprophyres are described; they are nearly all exposed along the coast, and are dealt with in the order in which they are met, commencing in the south-west and travelling clockwise round the island. The several dykes of lamprophyre penetrate all the major formations of the island, including all the conspicuous masses of granite, and there can, therefore

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