Title: Significance of Layer-Parallel Slip During Folding of Layered Sedimentary Rocks
Abstract: Research Article| October 01, 1974 Significance of Layer-Parallel Slip During Folding of Layered Sedimentary Rocks WILLIAM M. CHAPPLE; WILLIAM M. CHAPPLE 1Department of Geological Sciences, Brown University, Providence, Rhode Island 02912 Search for other works by this author on: GSW Google Scholar JOHN H. SPANG JOHN H. SPANG 2Department of Geology, University of Calgary, Calgary, Alberta, Canada T2N 1N4 Search for other works by this author on: GSW Google Scholar Author and Article Information WILLIAM M. CHAPPLE 1Department of Geological Sciences, Brown University, Providence, Rhode Island 02912 JOHN H. SPANG 2Department of Geology, University of Calgary, Calgary, Alberta, Canada T2N 1N4 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1974) 85 (10): 1523–1534. https://doi.org/10.1130/0016-7606(1974)85<1523:SOLSDF>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation WILLIAM M. CHAPPLE, JOHN H. SPANG; Significance of Layer-Parallel Slip During Folding of Layered Sedimentary Rocks. GSA Bulletin 1974;; 85 (10): 1523–1534. doi: https://doi.org/10.1130/0016-7606(1974)85<1523:SOLSDF>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The Greenport Center syncline is an asymmetric fold with a half wave length of about 40 m developed in the Devonian Becraft and Alsen Limestones on Becraft Mountain, New York. Twinning strains have been measured in 19 samples distributed so as to sample all of the structurally significant regions of the fold. The orientation and relative magnitudes of the observed strains are consistent with those expected from the buckling of a thick isotropic layer, but the observed magnitudes are too small by a factor of more than four. Local and nonsystematic variations in strain are much larger than those expected in the buckling of a continuous layer, and the Greenport Center syncline also contains abundant geologic evidence that slip between beds was important.A theoretical model of the folding of a free, anisotropic, linearly viscous layer of appropriate wave length/thickness ratio is analyzed. Although the smoothly distributed bedding-parallel shear of the model does not adequately represent the process of bedding slip in the real fold, it does permit the estimate of the degree of anisotropy necessary to produce observed limb dips with observed bending strains. If the viscosity coefficient for shear parallel to bedding is 0.03 times that for bending, the bending strains are reduced to the observed value; the required bedding slip could be produced by slip surfaces spaced about 30 cm apart if the average displacement on a slip surface were about 23 cm. The model of inherited asymmetry is both appropriate for the Greenport Center syncline and treatable within the present theoretical framework. Inherited asymmetry is shown to be possible for an anisotropic layer though not for an isotropic one. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
Publication Year: 1974
Publication Date: 1974-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 89
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