Transition from cataclastic flow to dislocation creep of feldspar: Mechanisms and microstructures

Research Article| July 01, 1987 Transition from cataclastic flow to dislocation creep of feldspar: Mechanisms and microstructures Jan Tullis; Jan Tullis 1Department of Geological Sciences, Brown University Providence, Rhode Island 02912 Search for other works by this author on: GSW Google Scholar Richard A. Yund Richard A. Yund 1Department of Geological Sciences, Brown University Providence, Rhode Island 02912 Search for other works by this author on: GSW Google Scholar Geology (1987) 15 (7): 606–609. https://doi.org/10.1130/0091-7613(1987)152.0.CO;2 Article history first online: 02 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 Jan Tullis, Richard A. Yund; Transition from cataclastic flow to dislocation creep of feldspar: Mechanisms and microstructures. Geology 1987;; 15 (7): 606–609. doi: https://doi.org/10.1130/0091-7613(1987)152.0.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 SocietyGeology Search Advanced Search Abstract Feldspar aggregates exhibit cataclastic flow over a wide range of conditions between low-temperature faulting and high-temperature dislocation creep; this is due to the ease of cracking on the two good cleavages and the difficulty of dislocation motion. Albite aggregates experimentally deformed at moderate to high pressures in the cataclastic flow regime are macroscopically ductile; their optical microstructures show little evidence of crushing and resemble those expected for dislocation creep. However, transmission electron microscopy (TEM) shows no dislocations or very limited dislocation mobility, but does show abundant distributed microcracks and microcrush zones that contain <0.1-µm-diameter grains. Cataclastic flow is likely to be an important deformation mechanism in nature, but it may have been overlooked because its optical microstructures have been misinterpreted and because the extreme grain size reduction facilitates transitions to other phases and deformation mechanisms. 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.