Figure F22. Diorite dikelet (Sample 335-1256D-Run19-RCJB-Rock C). A. Close-up photograph illustrating the occurrence of a diorite dikelet crosscutting granoblastic basalt. The diorite contains abundant black amphibole and has a fine-grained margin. Both the granoblastic basalt and the diorite dikelet are crosscut by a hydrothermal amphibole vein. B. Photomicrographs of amphiboles (Amph) intergrown with plagioclase (Plag) in the diorite dikelet in plane-polarized (left) and cross-polarized (right) light (Thin Section 40).
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