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 via 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, top noticeable within the Adirondack Mountains of northeastern long island, 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 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 japanese 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 most sensible illustrated by means of geologic relatives in New Hampshire and Maine; and five) Mesozoic rifting, observed 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 fascinating, 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 in the course of the Alleghenian orogeny.

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

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6B). The values for Ti02 and n05 are also plotted for the Taconic metabasalts. They show a distribution that overlaps with Zone 2 and Zone 3 rocks. Graphs in B show the distribution of LREE from mafic rocks from Zone 1 through Zone 4 in Vermont. Zone 1 is characterized by enriched LREE. Samples from Zone 2 show a general pattern that is similar to Zone 1. SevernJ. samples, however, are less enriched in LREE compared to the HREE. Zone 3 samples are similar to Zone 1 and 2 in that they are high in REE but their patterns are generally much flatter than the other two.

Z hf t ...... " 8top - - ,/ \ '" "- I -- , -, _ " ...... - -, '" Ii' ,,-'" ' ",: ~:i G" I "J'" ,;'" -:~. "'b'-' / FIGURE 3B Interpretative restoration of the ancient rift to drift stage passive margin of North America in the vicinity of the Lamoille River transect. The Camels Hump Group rocks (Tibbit Hill, CZth; Pinnacle CZp; White Brook, CZwb; Fairfield Pond, CZfp; and Underhill, CZu) are considered to be wholly developed in a rift environment. Variations in the stratigraphy and thickness of the various units reflect the effects of syn-rift volcanism.

Modified from Doll and others (1961). T162: 40 readily distinguished from the Waits River by the abundant distinctive beds of micaceous quartzite and the relative paucity or absence of beds of punky-brownweathering granulite. The Gile Mountain Formation forms two major north-northeast-trending belts across much of eastcentral and northeast Vermont, parallel to the belts of the Waits River Formation (fig. 2). 5-1 km) unit along the west margin of the trough. This unit, long considered basal to the sequence and designated the Northfield Formation by Doll and others (1961), is here reinterpreted as a more distal facies of the Gile Mountain Formation at the top of the Connecticut Valley trough sequence.

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