Abstract
The Pinckneyville quartz‐diorite complex underlies an area in eastern Alabama extending from the Coosa River in northwest Elmore County northeast through Coosa and Tallapoosa counties into Clay County.Dark‐gray, coarse‐grained quartz‐diorite gneiss constitutes the major part of the complex, but there are smaller amounts of granodiorite and granite gneiss. Hornblende biotite gneiss also occurs and is considered to represent either metamorphosed basic sills and dikes intruded earlier than the quartz‐diorite complex or possibly original sediments. Schist septa lie within the complex and are usually parallel to the regional strike. The sequence of intrusion as interpreted from inclusions and petrographic data is quartz‐diorite—granodiorite—granite. Small but persistent amounts of allanite and epidote are characteristic of the rocks of the complex. The texture is subporphyritic and shows evidence of protoclastic deformation.
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