Glass-Indurated Quartz Gouge in Sliding-Friction Experiments on Sandstone

Research Article| June 01, 1974 Glass-Indurated Quartz Gouge in Sliding-Friction Experiments on Sandstone M. FRIEDMAN; M. FRIEDMAN 1Center for Tectonophysics, Texas A&M University, College Station, Texas 77843 Search for other works by this author on: GSW Google Scholar J. M. LOGAN; J. M. LOGAN 1Center for Tectonophysics, Texas A&M University, College Station, Texas 77843 Search for other works by this author on: GSW Google Scholar J. A. RIGERT J. A. RIGERT 1Center for Tectonophysics, Texas A&M University, College Station, Texas 77843 Search for other works by this author on: GSW Google Scholar GSA Bulletin (1974) 85 (6): 937–942. https://doi.org/10.1130/0016-7606(1974)85<937:GQGISE>2.0.CO;2 Article history first online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation M. FRIEDMAN, J. M. LOGAN, J. A. RIGERT; Glass-Indurated Quartz Gouge in Sliding-Friction Experiments on Sandstone. GSA Bulletin 1974;; 85 (6): 937–942. doi: https://doi.org/10.1130/0016-7606(1974)85<937:GQGISE>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 Three types of glass-indurated quartzose gouge are recognized (optically and with SEM) along the sliding surfaces of 29° to 45° precut specimens of dry Tennessee Sandstone, deformed at 0.14- to 5.0-kb confining pressure, shortening rates of 10 to 10−4/sec, 24° to 410°C, and with displacements <1.0 cm. "Welded clumps" form in tests at 24° and ≤1.0-kb confining pressure. The welded portions of each clump are composed of quartz fragments indurated by an optically isotropic matrix (index of refraction of 1.500 to 1.520) that supports brittle fracture and is probably glass. As the temperature of the experiments is increased, "fibrous patches" become widespread. These patches are vesicular and conspicuously striated, they stand out in optical relief on top of quartz grains, they contain ordered microfractures that suggest extension along the sliding direction, and their "lee" edges are marked by very fine fibers that emanate from tapered bodies rooting in the patches. At high pressures and low temperatures, "welded plates" cover much of the sliding surfaces. These are fractured and striated, but nonfibrous. The glass indicates that local silica–fusion temperatures occurred during frictional sliding. The change in the nature of the gouge is accompanied by a change in sliding mode from stick-slip (25°C) to episodic (150° to 250°C) to stable sliding (410°C), and by a progressive increase in the coefficient of sliding friction from 0.58 at 25°C, to 0.72 at 410°C. 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.