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- W234124420 abstract "Greenville-age rocks are exposed in the Beaver Creek area in the Northwest Lowlands of New York State. The prominent structural grain in the area strikes approximately N40E and is defined by a series of metasedimentary and metaigneous rocks elongate parallel to the Beaver Creek Fault Zone. A series of 7 granitic augen gneiss bodies lies to the west of the fault. These bodies are elongate parallel to the Beaver Creek Fault Zone and are bordered by metasedimentary units. Structural analysis of the 7 granitic gneiss bodies shows that the bodies underwent several phases of ductile shear. These shearing events are responsible for both fabric development and the overall shape of the bodies. The granitic gneiss is a well-foliated and lineated augen gneiss. The foliation is defined by biotite alignment, quartz ribbons, and feldspar augen. The foliation has a strike of N42E, with dips ranging from 85SE to vertical. Quartz ribbon lineations plunge 20--25 NE. The gneiss exhibits three distinct ductile shear fabrics showing oblique slip with a large strike-slip component. Fabric asymmetry indicates oblique slip with a large component of sinistral shear. The second shear fabric is somewhat recovered but not annealed. Quartz ribbons are dominantly monogranular and many showmore » pronounced undulose extinction. Feldspar porphyroclasts form well-defined sigma grains showing a component of sinistral shear. The youngest ductile shear fabric is defined by quartz grain shape preferred orientation and mica fish. This third fabric exhibits a component of dextral shear, rather than sinistral shear. A late cataclastic texture crosscuts the earlier ductile fabrics. The elongate character of the 7 bodies and their NE/SE alignment is probably due to the regional shearing processes responsible for forming the fabric in the rocks.« less" @default.
- W234124420 created "2016-06-24" @default.
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- W234124420 date "1993-03-01" @default.
- W234124420 modified "2023-09-27" @default.
- W234124420 title "Ductile shear in granitic gneisses adjacent to the Beaver Creek fault zone, northwest lowlands, New York State" @default.
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