A Geochemical and Petrographical Study of Pillow Lavas from the Thetford Mines Ophiolite Complex, Quebec

Abstract

The pillow lava samples analyzed from the Thetford Mines ophiolite complex have petrographical and geochemical characteristics similar to those of metamorphosed mid-oceanic basalts. The rocks have undergone submarine weathering and low grade metamorphism typical of the greenschist facies. The chemical analyses support the hypothesis that only part of pillow basalt unit of the ophiolite was altered sufficiently to produce a spilitic basalt.