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Geochemistry permits distinction of two broad groups of volcanic rocks distinguished from the Avalon zone of southeastern New England. An alkalic suite is relatively enriched in K, Rb, Y, Zr, Nb, Zn, La, Ce, but lower in Al, Sr, and Ba compared to a calc-alkaline suite. The alkalic suite is compositionally similar to plutonic rocks that range in age from Late Ordovician to Devonian, whereas the calc-alkaline suite is similar to late Proterozoic plutonic rocks. Geochemical discriminant criteria developed in this chapter indicate that a number of the volcanic units previously have been incorrectly grouped and misinterpreted.

The late Proterozoic...

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