Download PDF by John B. Lyons, Wallace A. Bothner, Barry L. Doolan, Norman: A Transect Through the New England Appalachians: Burlington,

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

ISBN-10: 0875906079

ISBN-13: 9780875906072

ISBN-10: 1118666828

ISBN-13: 9781118666821

About The Product

Published via 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, most sensible obvious within the Adirondack Mountains of northeastern ny, but additionally obvious within the cores of the fairway 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 by means of 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 manhattan lie instantly south of our line of traverse); four) Acadian orogeny (Early to heart Devonian) - in actual fact the key tectonic, magmatic, and metamorphic occasion during this quarter, and most sensible illustrated by way of geologic kinfolk in New Hampshire and Maine; and five) Mesozoic rifting, followed through 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 japanese New Hampshire and western Maine, and a Permian (275 Ma.) intrusive of south-central New Hampshire. The latter age is exciting, since it is similar to that of granite slicing the Carboniferous (Westphalian) Narragansett Basin of southeastern New England, which used to be deformed and metamorphosed throughout the Alleghenian orogeny.

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Extra info for A Transect Through the New England Appalachians: Burlington, Vermont to Durham, New Hampshire July 2-8, 1989

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Fig. 1) in the Hyde Park quadrangle. Several stops will be made along and adjacent to the Ottauquechee belt which approximates the Baie Verte Brompton line (Williams and S1. Julien, 1982) in this part of the orogen. REGIONAL SETTING OF THE LAMOILLE RIVER TRANSECT The Lamoille River transect lies near the axis of the Quebec reentrant (Rankin, 1976; Figure 1). ). In comparison to the New York promontory and the comparable sections in the central and southern Appalachians, the rocks exposed in the Taconic hinterland of the Quebec reentrant have been less severely affected by mid- to late-Paleozoic deformation.

Fold axes of several generations plunge allochthonous cover sequences in the external parts of the predominantly northward with west-over-east rotation. orogen. This suggests the outcrop lies west of the synclinal axis separating the Buck Mountain and Fairfax Falls anticline. (CZu) NEAR THE Fold axes vary between N5W and N45E and plunge GREEN MOUNTAIN AXIS. shallowly northward. The dominant foliation dips The Underhill formation exposed in the river bed north moderately to the east and strikes N30-45E.

All three formations are considered to be of pre-Cheshire age and rift related. The chemistry of numerous interbedded greenstone bodies in the Stowe Formation suggests it originated on more fully extended North American lithosphere than any of the rift clastic lithologies to the west (Coish et ale 1985). In central Vermont the Stowe and Pinney Hollow T162: 34 are reportedly locally continuous in windows through the synformal Ottauquechee Fm. (T. Annstrong, personal communication, 1988). The Stowe Formation has undergone deep seated (amphibolite facies) metamorphism and uplift prior to the deposition of the overlying Moretown Formation.

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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.)


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