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Fractures in the region of the Rocky Hill anticline, Rocky Hill, Connecticut : a structural geological study / Henry K. Elliott, Jr.

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Identifier	Thesis 1644
Author	Elliott, Henry K., Jr.
Title	Fractures in the region of the Rocky Hill anticline, Rocky Hill, Connecticut : a structural geological study / Henry K. Elliott, Jr.
Publisher	Central Connecticut State University
Date	2001
Resource Type	Master's Thesis
Notes	The Rocky Hill anticline is a broad open fold in Triassic strata transverse to the Eastern Border Fault of the Connecticut Valley of Southern New England, and is crisscrossed by a complex pattern of faults and other brittle fractures. This study strives to explain relationships between faults and fractures and the stress field(s) responsible for the folding of the strata that comprise the structure. In order to understand the fracture pattern, the trend and plunge of the axial line, attitude of the axial plane, and inter-limb angle are determined. 600 fractures and faults in a 4 square mile area are evaluated for 34 characteristics (strike, dip, mineralization, slickenlines, etc) in a database capable of searching for trends amongst the dataset. Coeval fracture populations, conjugate shear fractures, stress fields, and rotation of stress fields are determined. Contemporaneous populations of fractures and faults are compared to models for fractures forming before, during, and after deformation of the strata. Results of this study are juxtaposed to models in the literature for fracture development in the Connecticut Valley. The axial plane of the anticline dips 88° to the southwest, with an axial orientation of 118°, and axial plunge of 4° downward toward the southeast. An inter-limb angle of 176° separates the northern limb of the fold, which dips 14° down to the northeast from the southern limb, which dips 10° down to the southwest. The Rocky Hill anticline most likely formed due to regional compression with synfold motion in a wrench tectonic setting. Greatest compressive stress, 01, was directed horizontally from the north-northeast. Shortening was accommodated by dextral strikeslip along north-northwest trending faults, and sinistral strike-slip along northeast trending faults. Some of these faults may have been pre-existing fractures, re-activated by the compressive stress field responsible for folding of the anticline. The stress field responsible for the majority of the faults and presumably for the formation of the anticline, rotated counter-clockwise through time from lower to higher stratigraphic position. The Rocky Hill anticline was also cut by northeast trending fractures after formation of the fold, and subsequent sinistral shearing occurred along some of these, offsetting the folded strata.
Subject	Geology -- Connecticut -- Rocky Hill Geology, Structural -- Connecticut -- Rocky Hill
Department	Department of Physics and Earth Science
Advisor	Dimmick, Charles W.
Type	Text
Digital Format	application/pdf
Language	eng
OCLC number	50655540
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Fractures in the region of the Rocky Hill anticline, Rocky Hill, Connecticut : a structural geological study / Henry K. Elliott, Jr.

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