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| Figure 12. Photograph of folded medium-grained leucocratic granite dike within coarse-grained to megacrystic leucocratic granitoid at Stop 15. Pen (top center), oriented parallel to foliation in the megacrystic granitoid and parallel to the trace of the axial plane in the folded dike, is 14 cm (5.5 in) long. Development of small lens of pegmatite within the dike on the left limb of the fold suggests that pegmatite was derived through differentiation of the medium-grained granitoid magma. |