Abstract

Slickensided fractures occur in 52% of the 235 Mesozoic dikes examined in Vermont, New Hampshire, and southern Maine. About 80% are tectonically reactivated cooling joints; about 20% are true faults. Stress configurations were derived from the fractures by using the Gephart stress inversion programs. The data provide clear evidence for east-northeast-west-southwest compression, north-south compression, and regional arching. Evidence of east-northeast-west-southwest compression dominates the data set. This stress has probably affected New England since Early Cretaceous time.

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