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Three ultramafic and associated rocks occur in a highly faulted zone of pre-Silurian metamorphosed rocks, in which serpentinites and talc-carbonate rocks occur as slivers along faults that separate contrasting lithic assemblages. Results of detailed investigation of the map pattern, fault fabrics, lithic assemblages and metamorphism of the ultramafic belt in the Jay area of northern Vermont and comparison with its southern continuation in Massachusetts are cited as evidence supporting interpretation of the ultramafic and associated rocks as imbricated fragments of oceanic crust. Emplacement of the fragments in a stratigraphic sequence that was originally deposited along the continental margin of North America and on adjoining oceanic crust accompanied development of an accretionary wedge associated with an east-dipping subduction zone. (Preceding abstracts)-M.S.
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Evidence for tectonic emplacement of ultramafic and associated rocks in the pre-Silurian eugeoclinal belt of western New England- vestiges of an ancient accretionary wedge.