Carrock Fell: a Study in the Variation of Igneous Rock-Masses—Part I. The Gabbro

Open Access
Publisher Website
Google Scholar
Abstract
I. Introduction During the last two years I have devoted some attention to the igneous rocks of Carrock Fell and the hills west of that well-known summit. Occurring in a somewhat critical situation on the border of the English Lake District, they were examined by Mr. J. E. Marr nd myself, partly with reference to their bearing on the general geology of the district; but, apart from this, they offer in themselves some features which are of sufficient interest to be worthy of record. I have had the advantage of my colleague's co-operation, more especially in the field-work, and take this opportunity of acknowledgeging my indebtedness to him. The earliest connected account of the Carrock Fell rocks was given by the late Mr. Clifton Ward in 1876.He recognized three general types of igneous rocks in the district: ( a Spherulittic felsite of Carrock Fell and Great Lingy; ( b Diorite (?) of Miton Hill and Round Knott; ( c Hypersthenite of Mosedale Crags and Langdale. He gave a brief account of their characters in the field and under the microscope, with chemical analyses od the first and last, and put forward a view and their mutual relations and mode of origin. In his opinion the several types pass into one another in the field, and he regarded them as produced by the metamorphism of part of the volcanic series, on the stroke of which they occur. Dr. C. O. Trechmann, in 1882, pointed out that the dominant pyroxene in the sol-callled hypersthenite is

This publication has 0 references indexed in Scilit: