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East Harpswell Group

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Series: GSA Memoirs
Published: 01 September 2010
DOI: 10.1130/2010.1206(10)
... Ordovician to Early Silurian rocks of the East Harpswell Group; Silurian to Early Devonian rocks of the Central Maine Basin; and highly tectonized enigmatic rocks of the Rye complex of uncertain age. Stratigraphic reassessment and new U/Pb zircon ages support a model of east-directed Middle Ordovician...
Journal Article
Published: 01 December 2023
Canadian Journal of Earth Sciences (2024) 61 (2): 205–222.
...Sophia A. Johnson; David P. West, Jr.; Emily M. Peterman The Yarmouth Island Formation of the East Harpswell Group (EHG) is an assemblage of metamorphosed volcanic and sedimentary rocks exposed in Casco Bay, Maine. Although previously interpreted to have been deposited ca. 445 Ma, two new U–Pb...
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U–Pb detrital zircon probability density plot from the Sebascodegan Formati...
Published: 01 December 2023
Fig. 8. U–Pb detrital zircon probability density plot from the Sebascodegan Formation of the East Harpswell Group and the Cape Elizabeth Formation of the Casco Bay Group (from Cartwright et al. 2019 ).
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Stratigraphic correlation chart for rocks in the Casco Bay area, coastal Ma...
Published: 01 December 2023
depositional age of 422 ± 20 Ma for Vassalboro Group rocks in south-central Maine—consistent with the Waterville Fm. fossil age. (3) East Harpswell Group: an unpublished U–Pb zircon age of 445 ± 2 Ma from metavolcanic rocks in the Yarmouth Island Fm. is reported in Hussey and Berry (2002) . However, this age
Journal Article
Published: 01 January 2015
European Journal of Mineralogy (2015) 27 (1): 19–29.
..., a pelitic unit of the Casco Bay Group at Harpswell Neck, Maine, USA. The mineral assemblage is biotite + chlorite + garnet + muscovite + quartz + plagioclase + ilmenite + chalcopyrite, and the mean size of garnet crystals is 400 μm ( Hixon, 2006 ). Peak-metamorphism estimates are 550 ± 25°C ( Hixon, 2006...
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Journal Article
Journal: Geology
Published: 01 July 2003
Geology (2003) 31 (7): 649–652.
... Casco Bay Group, and (4) the Late Ordovician–Early Silurian East Harpswell Group. All of the stratified rocks in the area of Figure 1 were metamorphosed to amphibolite facies conditions during the middle to late Paleozoic. (See Hussey [1988 ] and Hussey and Berry [2002 ] for details of the geology...
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Journal Article
Published: 01 March 2009
Journal of the Geological Society (2009) 166 (2): 201–204.
... of the Scottish Caledonides (Fig. 1 ). The Moine rocks and probably correlatives east of the Great Glen Fault were affected by mid-amphibolite-facies ’Knoydartian' metamorphism and intruded by syntectonic pegmatites at c . 790–840 Ma (e.g. Noble et al . 1996 ; Rogers et al . 1998 ; Vance et al . 1998...
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Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 01 December 2014
Lithosphere (2014) 6 (6): 409–418.
... detachments ( Martínez Catalán et al., 2002 , 2009 ). In the Órdenes complex ( Fig. 1 ), three types of units have been recognized from bottom to top at the nappe stack and grouped into the Lower, Middle, and Upper Allochthons. The Upper Allochthon consists of units that are derived from an ensialic magmatic...
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Journal Article
Published: 01 February 2005
The Canadian Mineralogist (2005) 43 (1): 157–182.
... units. The second phase created large regional folds, including the Piora and Molare synclines, and developed the main penetrative foliation, which strikes east–west and dips steeply north. The third phase produced a weak crenulation cleavage and small-scale folds whose axial planes strike southeast...
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Journal Article
Journal: AAPG Bulletin
Published: 15 June 2019
AAPG Bulletin (2019) 103 (6): 1321–1350.
... and LaHave platform to the east ( Poppe and Poag, 1993 ). The New England seamounts extend southeastward from the continental slope to the deep ocean floor. The Yarmouth arch is a complex horst trending southward that curves and plunges southwesterly beneath the outer edge of Georges Bank ( Wade, 1977...
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Journal Article
Published: 01 August 2017
Reviews in Mineralogy and Geochemistry (2017) 83 (1): 55–102.
... are the chemical potential gradients that are established between minerals such as the reactants and products of a metamorphic reaction or between different groups of minerals, such as between domains ( Fisher 1973 ). In this context, equilibration is attained when the chemical potentials of each the chemical...
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Journal Article
Published: 01 August 2017
Reviews in Mineralogy and Geochemistry (2017) 83 (1): 469–533.
... available (e.g., Ghent 1976 , 1977 ; Newton and Haselton 1981 ; Koziol and Newton 1988 ; McKenna and Hodges 1988 ; Berman 1990 ; Holdaway 2001 ; Caddick and Thompson 2008 ). The relative performance of most of these calibrations was compared by Wu and Cheng (2006) , but taken as a group the GASP...
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