By John B. Lyons, Wallace A. Bothner, Barry L. Doolan, Norman L. Hatch, Robert H. Moench, Rolfe Stanley(auth.)
About The Product
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, top obvious within the Adirondack Mountains of northeastern big apple, 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 sector, and top illustrated by means of geologic relatives 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 noticeable 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 the same 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
Ultramafic pods in the Hazens are volumetrically small but appear to be a discussion. T162: 37 characteristic feature of this fonnation on a regional scale. The talc steatite body or one parallel to it can be viewed on the south facing cliff face along the waterfall. Here, the talc steatite body displays a highly foliated alteration zone, intense internal defonnation, and large green tremolite/actinolite prisms. Although difficult to prove here, the talc body may be aligned in a sheath fold parallel with the down-dip smear lineations on the dominant schistosity.
The reconstruction reflects a typical "steers head" geometry compatible with mcxlern theories of passive margin formation (Figure 4A). 2. The earliest deformation associated with the Taconic orogeny was related to obduction of ophiolites and coeval formation of aureole rocks along the sole (Figure 4B). 3. The aureole came in contact with subduction melange at pressure conditions compatible to blueschist metamorphism (Fig. 4B) before being rapidly exhumed by both east-over-west transport and backfolding of the aureole fault surface (Gale, 1986; Doolan et aI.
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. 6B). The values for Ti02 and n05 are also plotted for the Taconic metabasalts.
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.)