By John B. Lyons, Wallace A. Bothner, Barry L. Doolan, Norman L. Hatch, Robert H. Moench, Rolfe Stanley(auth.)
About The Product
Published by means 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, top obvious within the Adirondack Mountains of northeastern manhattan, but in addition 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 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 long island 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 area, and most sensible illustrated via geologic kinfolk 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 noticeable 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 the same 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 resources for A Transect Through the New England Appalachians: Burlington, Vermont to Durham, New Hampshire July 2-8, 1989
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.
East of the Ottauquechee belt occur a variety of rock types which show dramatic changes from north to south (Figure 1). Daniel Formation (pre-middle Ordovician). The Caldwell extends into Vermont (Cca of Figure 2), where it is juxtaposed against the Moretown (Om of Figure 2). Farther south the Ottauquechee is in fault contact with the Stowe Formation which, on the basis of lithic similarity, correlates with the Pinney Hollow, and Underhill formations. All three formations are considered to be of pre-Cheshire age and rift related.
1ft Il... A. , 10 - , ,-, , , .. - , ... , -, , , -. , II ,,,", , '..... I ...... "~ .... LATE PRECAMBRIAN - CAMBRIAN PASSIVE MARGIN , FIGURE 4 Tectonic synthesis of the northern Vennont Taconian transect (Modified from Doolan, 1988) Figure 24E represents the present day cross section perpendicular to the strike of the north ann of the Quebec reentrant (A-A' in Figure 2-1). Diagonally ruled lines in B,C, and D represent oceanic lithosphere. Stipple pattern in B, C, D, and E represents Caldwell and related rocks of the Quebec reentrant (Cca) not shown in the restored Vermont section of A.
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.)