TY - JOUR
T1 - Horizontal slip along Alleghanian joints of the Appalachian plateau
T2 - Evidence showing that mild penetrative strain does little to change the pristine appearance of early joints
AU - Engelder, Terry
AU - Haith, Benjamin F.
AU - Younes, Amgad
N1 - Funding Information:
Discussions with Peter Geiser, Alfred Lacazette, David McConaughy, Staci Loewy, and Paul Hagan were particularly helpful in directing our ideas for this paper. The work was supported by funds from the Penn State Seal Evaluation Consortium (SEC).
Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2001
Y1 - 2001
N2 - Some Alleghanian joints in black shales of the Geneseo and Middlesex Formations of the Catskill Delta complex, Finger Lakes district, New York, slipped horizontally up to 8 cm. Horizontal slip is measured by the offset of ENE-striking joints. Alleghanian joints striking 330-350° display a right-lateral slip with an average value of 1.9 cm, while joints striking 004-010° slip in the left-lateral sense with an average value of 1.3 cm. The maximum horizontal stress (SH) driving this slip falls between 350° and 004°, the orientation of local Alleghanian layer-parallel shortening as indicated by both disjunctive and pencil cleavage. By commonality of orientation, we infer that slip on Alleghanian joints is driven contemporaneously with layer-parallel shortening. If so, the offset ENE-striking joints predate the Alleghanian stress field. These observations mean that both pre-Alleghanian and early Alleghanian joints persist through a period of penetrative strain.
AB - Some Alleghanian joints in black shales of the Geneseo and Middlesex Formations of the Catskill Delta complex, Finger Lakes district, New York, slipped horizontally up to 8 cm. Horizontal slip is measured by the offset of ENE-striking joints. Alleghanian joints striking 330-350° display a right-lateral slip with an average value of 1.9 cm, while joints striking 004-010° slip in the left-lateral sense with an average value of 1.3 cm. The maximum horizontal stress (SH) driving this slip falls between 350° and 004°, the orientation of local Alleghanian layer-parallel shortening as indicated by both disjunctive and pencil cleavage. By commonality of orientation, we infer that slip on Alleghanian joints is driven contemporaneously with layer-parallel shortening. If so, the offset ENE-striking joints predate the Alleghanian stress field. These observations mean that both pre-Alleghanian and early Alleghanian joints persist through a period of penetrative strain.
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U2 - 10.1016/S0040-1951(01)00092-0
DO - 10.1016/S0040-1951(01)00092-0
M3 - Article
AN - SCOPUS:0034877430
SN - 0040-1951
VL - 336
SP - 31
EP - 41
JO - Tectonophysics
JF - Tectonophysics
IS - 1-4
ER -