The common everyday usage of the term “banding” would suggest that it should be employed to describe essentially two-dimensional, strip-like features of igneous rocks. However, it has come to be used by geologists to describe igneous rocks that contain macroscopic inhomogeneities with an essentially sheet-like form, although it should be noted that in many outcrops of limited size these inhomogeneities may appear to be two-dimensional. The inhomogeneities always have a measurable thickness (normally ranging from a few millimeters to several metres) although this dimension is generally smaller by at least an order of magnitude than the length and breadth of the “band.” Structures, such as foliation, that are defined simply by the orientation of crystals and inclusions are thus excluded from this discussion. “Bands” may show varying degrees of regularity and persistence: ++ some cases they are formed by extensive planar features of constant thickness, but in others they are defined by...
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Munro, M. (1989). Banding in igneous rocks . In: Petrology. Encyclopedia of Earth Science. Springer, Boston, MA. https://doi.org/10.1007/0-387-30845-8_23
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