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Metamorphic, Thermal, and Tectonic Evolution of Central New England |
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| Authors: | SPEAR FRANK S; KOHN M J; CHENEY JOHN T; FLORENCE F |
| Institution: | 1DEPARTMENT OF EARTH AND ENVIRONMENTAL SCIENCES, RENSSELAER POLYTECHNIC INSTITUTE, TROY, NY 12180, USA 2DEPARTMENT OF GEOLOGICAL SCIENCES, UNIVERSITY OF SOUTH CAROLINA, COLUMBIA, SC 29208, USA 3DEPARTMENT OF GEOLOGY, AMHERST COLLEGE, AMHERST, MA 01002, USA 4SCIENCE DIVISION, JEFFERSON COMMUNITY COLLEGE, WATERTOWN, NY 13601, USA |
| Abstract: | A new, detailed tectonic model is presented for the Acadianorogenic belt of central New England (Vermont and New Hampshire)that accounts for a wide range of petrological and structuralobservations. Three belts are considered: the Eastern Vermont,Merrimack, and intervening Bronson Hill belts. Specific observationsin eastern Vermont that are accounted for in the model includethe following. P–T paths are clockwise with maximum pressuresnear the Athens, Chester, and Strafford domes of 8–11kbar, but with maximum pressures decreasing to 3–5 kbarat the boundary with the Bronson Hill belt. Differential exhumationof the Vermont domes relative to the rocks in easternmost Vermontis required by the recorded differences in maximum pressure(5–6 kbar; 15–20 km) and the present-day geographicalseparation (7–10 km). Specific observations in New Hampshirethat are explained include the following. P–T paths inthe Merrimack belt are counter-clockwise with maximum pressuresof 4–5 kbar and are related to high regional heat flowand heat transfer by early Acadian plutons. P–T pathsin the Bronson Hill belt are intimately associated with structuralposition. An early contact metamorphism is evidenced in theSkitchewaug and Fall Mountain nappes near contacts with theearly Acadian Bethlehem gneiss ( |
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