Speer : Evolution of Magmatic Afm Assemblages in Granitoid
نویسنده
چکیده
Many of the late Paleozoic granitoid plutons of the southern Appalachians are composite bodies with coarsegrained amphibole + biotite and biotite varietal facies (Speer et al., 1980). From field relations, these facies appear closely related, and multiple intrusion or differentiation comes to mind as an explanation for the relationship. In the Liberty Hill pluton, the coarse-grained central amphibole + biotite granitoids grade imperceptibly into marginal biotite granitoids, seemingly ruling out multiple intrusions. The compositions of the marginal biotite fa-
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