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

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 way of the yankee 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 noticeable within the Adirondack Mountains of northeastern long island, 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 through the Massabesic Gneiss and comparable rocks of southeastern New Hampshire; three) Taconian (Mid-Ordovician) tectonism and metamorphism (the Taconic Mountains of western Vermont and japanese manhattan lie instantly south of our line of traverse); four) Acadian orogeny (Early to center Devonian) - essentially the main tectonic, magmatic, and metamorphic occasion during this area, and top illustrated via 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 jap New Hampshire and western Maine, and a Permian (275 Ma.) intrusive of south-central New Hampshire. The latter age is interesting, 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

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6) Fog Hill 7) F~ Hill 3) Glass Lake ". 4) Ward Hoflow 5) pillow basalt. ~"~~:~ .... ,~,, ' el ~E :! ,'...... ~~~--------~ ell 0 _ ~ __ Eu B) Metabasalt from Chatham slice 0 1) Turner Mtn. '-. - ~ ! IG La c. , r r Er Tm , I Yb Lu FIGURE 8. Geochemistry of mafic rocks in central Vermont (Coish, 1987 and 1988) and in the Rensselaer Plateau and Chatham slices of the Taconic allochthons (Ratcliffe, 1987). Diagrams in A show the average values of Ti02, a, and La/Yb (a measure of LREE enrichment) and the variation in Ti02 vs n05 (lower graph) for mafic rocks of basaltic composition from Zone 1 through Zone 4 from Vermont.

5) West-dipping shear bands are present here and there. 6) Westward displacement (N75W) of the upper plate is documented by "S" shaped folds, "Z" shaped quartz veins, quartz porphyroblasts, and late shear bands. Potential Stop - Cheshire Quartzite along the New Haven River west of West Lincoln. Discussion by Charlotte Mehrtens. Stop 1-3 - Western Contact of the Eastern Lincoln Massif (second bridge east of Lincoln on the Lincoln Gap Road). This outcrop shows the western contact between the Middle Proterozoic rocks of the Eastern Lincoln massif and the overlying basal conglomerate of the Pinnacle Formation.

The existence of these cover rocks provide structures are preserved by the well-bedded nature of this important constraints in locating the root zones of formation. 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.

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