Brimfield Formation

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Series: GSA Memoirs
Published: 01 January 1976
DOI: 10.1130/MEM148-p253
... of metamorphosed aluminous mudstone and siliceous siltstone. Metamorphosed limy mudstone, euxinic mudstone, fine-grained volcaniclastic debris, and lava form marker units that may extend tens of kilometres laterally. The sequence is divided into four formations, each containing many lenticular units. Three...
Series: GSA Special Papers
Published: 01 January 1990
DOI: 10.1130/SPE245-p209
... orthogneiss. Rocks originally mapped as Brimfield Formation (Merrimack terrane) west of Old Saybrook are shown to correlate with the Middletown Formation of the Bronson Hill terrane. This new correlation makes all plagioclase gneisses of the Killingworth dome isolated from rocks of other terranes...
Journal Article
Published: 01 October 2015
American Mineralogist (2015) 100 (10): 2254-2271.
...Jennifer A. Axler; Jay J. Ague Abstract This study investigates distinctive oriented, needle-shaped multiphase inclusions found within cores of garnets from felsic granulites of the Upper Member of the Bigelow Brook Formation and the Brimfield Schist (northeastern Connecticut, U.S.A.). The rocks...
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Series: Geological Society, London, Special Publications
Published: 01 January 2007
DOI: 10.1144/GSL.SP.2007.277.01.10
EISBN: 9781862395251
... Abstract Across much of the Gulf Coast basin of the USA, the Smackover Formation consists of a nearly 100 m-thick shoaling upward cycle capped by oolitic/oncolitic packstones and grain-stones. It has long been interpreted as a homoclinal ramp succession, which was analogous to the modern...
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Journal Article
Published: 01 November 2018
American Mineralogist (2018) 103 (11): 1851-1868.
... orogenic belt (Devonian) and form part of the Brimfield Schist. The Brimfield and the adjacent Bigelow Brook Formation contain silica-saturated rocks that have previously been shown to have undergone ∼1000 °C metamorphism. The pressure was less well constrained at ≥ ∼1 GPa. Silica-undersaturated rocks hold...
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Common textures in rocks from the Upper Member of the Bigelow Brook Formati...
Published: 01 October 2015
Figure 4 Common textures in rocks from the Upper Member of the Bigelow Brook Formation and the Brimfield Schist, Connecticut. ( a ) Photo of a megacryst pseudomorph of sillimanite after kyanite [131A]. ( b ) Photomicrograph of sillimanite with inclusions of spinel (Spl) and ilmenite (Ilm
Journal Article
Journal: Geology
Published: 01 February 2013
Geology (2013) 41 (2): 271-274.
... and temporally, than is currently recognized. The precipitates occur in a belt at least 25 km long in the Brimfield Schist and the adjacent Tatnic Hill Formation ( Fig. 1 ). The exposures are dominated by metapelitic and quartzofeldspathic gneisses, but also include pods and layers of calc-silicates...
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Journal Article
Published: 01 May 2012
American Mineralogist (2012) 97 (5-6): 840-855.
... have been discovered in the cores of garnet from the Brimfield Schist and Tatnic Hill Formation ( Fig. 2 ). These rock units are part of the Merrimack synclinorium in northeastern Connecticut, which underwent deformation and peak metamorphism during the Devonian Acadian orogeny (e.g., Rodgers 1981...
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Journal Article
Published: 01 November 2006
American Mineralogist (2006) 91 (11-12): 1730-1738.
... are preserved in what appear to be discrete, thin zones in the granulite-facies of south-central Massachusetts. However, any proposed mechanism of formation must account for the rarity of this occurrence. The second, and more plausible explanation for this rare occurrence of granulite-facies tourmaline...
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