By John B. Lyons, Wallace A. Bothner, Barry L. Doolan, Norman L. Hatch, Robert H. Moench, Rolfe Stanley(auth.)
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Published by means of the yank Geophysical Union as a part of the Field journey Guidebooks Series.
This traverse around the Northern Appalachians from the environs of Burlington, Vt. to Portsmouth, N.H. (fig. 1) demonstrates a geology which displays the next tectono-metamorphic and/or magmatic occasions: 1) Grenvillian (Precambrian Y) orogeny, top obvious within the Adirondack Mountains of northeastern big apple, but in addition obvious within the cores of the golf green Mountain and Lincoln massifs of west-central Vermont and the Chester-Athens and Sadawga-Rayponda domes of southeastern Vermont; 2) Avalonian (Precambrian Z) orogeny, evidenced via the Massabesic Gneiss and similar rocks of southeastern New Hampshire; three) Taconian (Mid-Ordovician) tectonism and metamorphism (the Taconic Mountains of western Vermont and jap big apple lie instantly south of our line of traverse); four) Acadian orogeny (Early to center Devonian) - basically the foremost tectonic, magmatic, and metamorphic occasion during this quarter, and top illustrated by way of geologic kin in New Hampshire and Maine; and five) Mesozoic rifting, followed via the emplacement of ring-dikes and shares of the White Mountain (Jurassic and Cretaceous) plutonic-volcanic complexes, mainly in New Hampshire (figs. 2 and 3). to not be visible are a few Mississippian (325 Ma.) plutons of jap New Hampshire and western Maine, and a Permian (275 Ma.) intrusive of south-central New Hampshire. The latter age is exciting, since it is the same to that of granite slicing the Carboniferous (Westphalian) Narragansett Basin of southeastern New England, which used to be deformed and metamorphosed through the Alleghenian orogeny.
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Additional resources for A Transect Through the New England Appalachians: Burlington, Vermont to Durham, New Hampshire July 2-8, 1989
The age and metamorphic conditions of the aureole record the history of juxtaposition of obducted ophiolites (Laurent, 1975) with the ancient passive margin of North America. Baie Verte Brompton Line and Eastern Zones The Hazens Notch and included Belvidere Mountain complex rocks are terminated to the east by the Baie Verte - Brompton line (BVB line; Williams and St. Julien, 1982). In northern Vermont, the BVB line approximates the outcrop width of the steeply-plunging Ottauquechee Formation and the Caldwell equivalents (COo and Cca, respectively, Fig.
2). Lithic symbols for the sedimentary cover are the following: the platform sequence, shown by the rectangle and dot pattern, consists of carbonate and siliciclastic rocks of the Cheshire, Dunham, Monkton, Winooski, Danby, Clarendon Springs and equivalent formations. The slope-rise and outer rise sequence consists of four groups ofrocks each of which is characterized by a dominant set of rocks which is considered distinctive for that group. Contacts between the groups are gradational. The basal sequence consists of two groups.
Fonnula proportion NaM4 versus (AIVI + Fe3 + 2Ti + Cr) for amphibole- chlorite - epidote plagioclase - quartz schist from central Vennont. Sample localities identified by VJL numbers are from Laird and others (1984). Localities in ( ) are from areas west (W) of in the inferred Taconic Root Zone (TRZ) or from areas east (E) of the Taconic Root Zone as shown in figure 2. Areas of high-, medium-, low-pressure facies series metamorphism are from Laird and others (1984). Increasing temperatures of metamorphism results in increasing advancement along the X and Y axes.
A Transect Through the New England Appalachians: Burlington, Vermont to Durham, New Hampshire July 2-8, 1989 by John B. Lyons, Wallace A. Bothner, Barry L. Doolan, Norman L. Hatch, Robert H. Moench, Rolfe Stanley(auth.)