Origin and evolution of the southeastern Merrimack belt, Massachusetts
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The Ordovician to Early-Devonian metasedimentary Merrimack belt of the southeastern New England Appalachian Mountains is deformed by multiple generations of folds that may have been a result of the Acadian (~421-395 Ma) and/or Alleghanian (~315-290 Ma) orogenies. The adjacent Nashoba terrane to the southeast was deformed primarily during the Acadian orogeny, and does not show much evidence for Alleghanian deformation and metamorphism, suggesting that the deformation in the Merrimack belt may also be largely a result of the Acadian orogeny. However, existing 40Ar/39Ar geochronology results suggest ...