Photograph of the Month

摘要

Biotite-amphibolite showing three stages of break up related to melting and melt extraction. On the left-hand-side a metric block of amphibolite has an original foliation (horizontal in the photograph) and few leucosomes. The central part shows an increase in leucosome fraction and partial disruption of the amphibolite. On the right-hand-side the original amphibolite is fully disrupted to form a stretched diatex-ite. This evolution from left to right is traced by the leucocratic dyke in the upper part of the photograph, which evolves from relatively straight, on the left, to folded in the centre and disrupted on the centre right, continuing again on the far right.