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 January 2015
European Journal of Mineralogy (2015) 27 (1): 19–29.
... from the Jewell Formation, 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...
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Journal Article
Journal: Geology
Published: 01 July 2003
Geology (2003) 31 (7): 649–652.
...-Brunswick sequence, (3) the Middle to Late Ordovician 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...
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...
Journal Article
Journal: Lithosphere
Publisher: GSW
Published: 01 December 2014
Lithosphere (2014) 6 (6): 409–418.
... the higher- P and - T conditions. To the east of the detachment, the O Pino metapelites reflect upper-amphibolite-facies transitional to granulite-facies conditions (9–11 kbar and 700–800 °C, which were constrained by conventional geothermobarometry that did not use the whole bulk composition of the entire...
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Journal Article
Published: 01 February 2005
The Canadian Mineralogist (2005) 43 (1): 157–182.
... folding might have displaced the crystals from their original relative positions. The amounts of any such displacements are unknown. But to alter the MCF so as to yield a false diffusion-controlled signal, movements during shearing would have to preferentially group together smaller crystals while...
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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.
... of the chemical components ( Fig. 1b ). The driving forces for diffusion 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...
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Journal Article
Published: 01 August 2017
Reviews in Mineralogy and Geochemistry (2017) 83 (1): 469–533.
... 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 calibrations have become probably the most widely used chemical geobarometer...
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