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Geological Society, London, Special Publications; 1984; v. 14; p. 245-251;
DOI: 10.1144/GSL.SP.1984.014.01.22
© 1984 Geological Society of London

North America

A clockwise rotation of Variscan strain orientation in SE New England and regional implications

R. P. Wintsch & J.-P. Lefort

Department of Geology, Indiana University, Bloomington, Indiana 47405, U.S.A.
Institut de Géologie, Université de Rennes, 35042 Rennes Cédex, France

A temperature-time-strain path is described for the Honey Hill fault system in eastern Connecticut, U.S.A. The path is based on 40Ar-39Ar mineral age data, on metamorphic petrology and on the orientation of mineral lineations and other small-scale structures in ductile fault zones. Collectively, the data show that the thrusting direction rotated from ESE at 290 Ma to due south at 250 Ma. These results coincide in the sense of rotation and in the orientation of movement with predictions emerging from hypotheses concerning the collision of Gondwanaland with Laurussia. If southern New England can be shown not to have rotated during this collision, then the data from eastern Connecticut would suggest that the WNW approach of Gondwanaland toward Laurussia turned north only in mid-Permian times.