The Metamorphism of the Carrock Fell Gabbro; with a Note on the Origin of the Sulphide Veins of the Caldbeck Fells

Extract

WITHIN the last two years a cutting has been made at the south-east corner of Carrock Fell, a few yards north of the village of Mosedale, for the purpose of obtaining road-metal. This has opened an interesting section near the margin of the intrusion. The rocks exposed comprise two varieties of gabbro and enclosed Eycott lava. Of the two types of gabbro, that next the lava is of the quartz-bearing variety, exhibiting the prevailing dark-green tint in the hand specimen, and carries large flakes of biotite. This is succeeded by the same type of gabbro, but in a highly metamorphosed condition, at once evident in the hand specimen, which is lighter in colour, primarily owing to the decomposition of the felspars.