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By John B. Lyons, Wallace A. Bothner, Barry L. Doolan, Norman L. Hatch, Robert H. Moench, Rolfe Stanley(auth.)

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Published through 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 subsequent tectono-metamorphic and/or magmatic occasions: 1) Grenvillian (Precambrian Y) orogeny, most sensible noticeable within the Adirondack Mountains of northeastern manhattan, but additionally 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 japanese big apple lie instantly south of our line of traverse); four) Acadian orogeny (Early to center Devonian) - truly the key tectonic, magmatic, and metamorphic occasion during this zone, and most sensible illustrated via geologic family in New Hampshire and Maine; and five) Mesozoic rifting, observed by way of 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 obvious are a few Mississippian (325 Ma.) plutons of japanese New Hampshire and western Maine, and a Permian (275 Ma.) intrusive of south-central New Hampshire. The latter age is fascinating, since it is similar to that of granite slicing the Carboniferous (Westphalian) Narragansett Basin of southeastern New England, which was once 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

Example text

Thompson, 1975). The Hazens Notch Formation is visited in Stop 8 of this excursion. S. Appalachians. The blueschist occurrences (Laird and Albee, 1981) are found within the Belvidere Mountain amphibolite at Tillotson Peak (Figure 3). , 1982), occurs in the Belvidere Mountain as a polydeformed metamorphic aureole along the sole of tectonically emplaced ultramafic rocks. 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.

C Z . PI~ ••• i. , •. 4~ D ' . " " . , 4 P ••• 1' •• CZ', CZ'p " . ' .. ,••••••. " ... 14 P••• , . ' • • " . ' C~.. , ? , Y ... v r ,I,""" , ~ " -v tl ~ FIGURE 3A Stratigraphic correlation of the Camels Hump Group between Quebec and Vermont The stratigraphic column for the Milton quadrangle is modified from the interpretation of Carter (1978) by proposing an unconfonnity above the Tibbit Hill volcanics (Stop 2). The Pinnacle exposed in the Georgia Mountain anticline is stratigraphically and lithically correlative with the upper Pinnacle of the Gilson Mountain quadrangle.

The rock here is a light-gray, medium-grained, unfoliated granite composed of quartz, microcline, oligoclase, biotite and muscovite.

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