Seismic slip record in carbonate-bearing fault zones: An insight from high-velocity friction experiments on siderite gouge

Research Article| December 01, 2007 Seismic slip record in carbonate-bearing fault zones: An insight from high-velocity friction experiments on siderite gouge Raehee Han; Raehee Han 1Department of Earth and Environmental Sciences, Korea University, Seoul 136-701, Republic of Korea Search for other works by this author on: GSW Google Scholar Toshihiko Shimamoto; Toshihiko Shimamoto 2Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan Search for other works by this author on: GSW Google Scholar Jun-ichi Ando; Jun-ichi Ando 3Department of Earth and Planetary Systems Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan Search for other works by this author on: GSW Google Scholar Jin-Han Ree Jin-Han Ree 4Department of Earth and Environmental Sciences, Korea University, Seoul 136-701, Republic of Korea Search for other works by this author on: GSW Google Scholar Author and Article Information Raehee Han 1Department of Earth and Environmental Sciences, Korea University, Seoul 136-701, Republic of Korea Toshihiko Shimamoto 2Division of Earth and Planetary Sciences, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan Jun-ichi Ando 3Department of Earth and Planetary Systems Science, Hiroshima University, Higashi-Hiroshima 739-8526, Japan Jin-Han Ree 4Department of Earth and Environmental Sciences, Korea University, Seoul 136-701, Republic of Korea Publisher: Geological Society of America Received: 21 May 2007 Revision Received: 28 Jul 2007 Accepted: 02 Aug 2007 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 The Geological Society of America, Inc. Geology (2007) 35 (12): 1131–1134. https://doi.org/10.1130/G24106A.1 Article history Received: 21 May 2007 Revision Received: 28 Jul 2007 Accepted: 02 Aug 2007 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Raehee Han, Toshihiko Shimamoto, Jun-ichi Ando, Jin-Han Ree; Seismic slip record in carbonate-bearing fault zones: An insight from high-velocity friction experiments on siderite gouge. Geology 2007;; 35 (12): 1131–1134. doi: https://doi.org/10.1130/G24106A.1 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 Pseudotachylyte formed by frictional melting has been the only unequivocal evidence of past seismogenic fault slip. We report from high-velocity friction experiments on siderite-bearing gouge that mineral decomposition due to frictional heating also can leave evidence of paleoseismic events along shallow crustal faults other than pseudotachylyte. Experiments were conducted room dry on simulated gouge composed of siderite or mixture of siderite, calcite, and quartz, initially at room temperature, under normal stresses of 0.6–1.3 MPa and at seismic slip rates of 1.3–2.0 m/s. In all cases, gouge exhibited dramatic slip weakening and siderite was decomposed into nanocrystalline magnetite and CO2 gas, as confirmed by CO2 measurement, X-ray diffraction analyses, and transmission electron microscopy. The weakening was caused by the low frictional strength of ultrafine decomposition products at seismic slip rates. Magnetite formation during shearing changed gouge color to black and increased magnetic susceptibility by a few orders of magnitude. Those changes can be recognized in natural fault zones, and black gouge in the Chelungpu fault zone in Taiwan is perhaps such an example. Thus our results suggest that thermal decomposition in shallow crustal faults can be an important co-seismic process not only for dynamic fault weakening, but also for leaving seismic slip records. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.