Abstract

Crystalline basement rocks have undergone an extended sequence of events that include several intense deformations, formation of three types of granitic rocks, and emplacement of two generations of granitic and mafic dikes. Radiomctric datessug-gest that the last major orogenic event was during the middle Ordovician, but geologic history probably extends back into the Prccambrian.

First Page Preview

First page PDF preview
You do not currently have access to this article.