Abstract

Research Article| April 01, 1966 Experimental Deformation and Folding in Phyllite M. S PATERSON; M. S PATERSON Dept. Geophysics, Australian National University, Canberra, Australia Search for other works by this author on: GSW Google Scholar L. E WEISS L. E WEISS Dept. Geology and Geophysics, University of California, Berkeley, California Search for other works by this author on: GSW Google Scholar GSA Bulletin (1966) 77 (4): 343–374. https://doi.org/10.1130/0016-7606(1966)77[343:EDAFIP]2.0.CO;2 Article history received: 24 Nov 1964 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation M. S PATERSON, L. E WEISS; Experimental Deformation and Folding in Phyllite. GSA Bulletin 1966;; 77 (4): 343–374. doi: https://doi.org/10.1130/0016-7606(1966)77[343:EDAFIP]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 A phyllite has been experimentally deformed in various orientations at room temperature and high confining pressure (mainly 5 kb). It glides easily on the foliation in favorable orientations. However, when the foliation is oriented nearly parallel to the direction of compression, folds of similar form are extensively developed, especially when the specimen is constrained in a thick metal jacket. The folds have axial planes of several orientations and include kinks, conjugate folds, and more tightly appressed similar folds. The latter have axial planes approximately perpendicular to the original orientation of the foliation and are shown to evolve from the interaction of oppositely inclined kink bands. Up to about 50 per cent shortening, the deformation proceeds by growth of the kinked regions, within which little further strain occurs, rather than by progressive deformation simultaneously in all regions. All the structures developed bear close resemblance to natural structures, suggesting geometrically similar evolution in spite of different conditions of pressure, temperature, and time.The evolution of flexural slip folding is discussed in detail for a model in which the only fundamental mechanism of deformation is glide on a unique set of parallel planes ("ideal foliated body"), assuming that the body initially yields by kinking in a regular manner. The structural evolution observed experimentally is well fitted to a first approximation by this ideal model, although departures in detail indicate that some other mechanisms of deformation are effective locally. In considering various geological implications, it is suggested that kinklike flexural slip folding may play a more important part in the evolution of natural similar folds than has been hitherto recognized. 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.

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