Plastic Deformation of Quartz in Nature

Research Article| November 01, 1958 PLASTIC DEFORMATION OF QUARTZ IN NATURE S. W BAILEY; S. W BAILEY DEPARTMENT OF GEOLOGY, UNIVERSITY OF WISCONSIN, MADISON 6, WIS. Search for other works by this author on: GSW Google Scholar R. A BELL; R. A BELL DEPARTMENT OF GEOLOGY, UNIVERSITY OF WISCONSIN, MADISON 6, WIS. Search for other works by this author on: GSW Google Scholar C. J PENG C. J PENG DEPARTMENT OF GEOLOGY, UNIVERSITY OF WISCONSIN, MADISON 6, WIS. Search for other works by this author on: GSW Google Scholar Author and Article Information S. W BAILEY DEPARTMENT OF GEOLOGY, UNIVERSITY OF WISCONSIN, MADISON 6, WIS. R. A BELL DEPARTMENT OF GEOLOGY, UNIVERSITY OF WISCONSIN, MADISON 6, WIS. C. J PENG DEPARTMENT OF GEOLOGY, UNIVERSITY OF WISCONSIN, MADISON 6, WIS. Publisher: Geological Society of America First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1958, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1958) 69 (11): 1443–1466. https://doi.org/10.1130/0016-7606(1958)69[1443:PDOQIN]2.0.CO;2 Article history 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 S. W BAILEY, R. A BELL, C. J PENG; PLASTIC DEFORMATION OF QUARTZ IN NATURE. GSA Bulletin 1958;; 69 (11): 1443–1466. doi: https://doi.org/10.1130/0016-7606(1958)69[1443:PDOQIN]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 Quartz grains occurring in naturally deformed rocks, irrespective of mode of origin, exhibit a wide variety of deformation features, including undulatory extinction, deformation lamellae, fracturing, and marginal granulation. X-ray studies of individual grains show that most of the quartz has deformed plastically by bend gliding. One of the three crystallographic a axes is always the major axis of bending, but no unique glide direction or glide plane has been established. The optical features and the details of the X-ray patterns may be explained and correlated by a theory involving dislocations and polygonizalion, whereby the bent crystal is transformed into a number of elongate, relatively perfect crystallites inclined to one another at small angles and separated by regions of atomic misfit. Undulatory extinction is explained as the optical expression of the results of bend gliding and polygonization. Deformed crystals show a significant decrease in the frequency of Dauphiné twinning; this is also attributed to the bending process. 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.