Pseudotachylyte from an ancient accretionary complex: Evidence for melt generation during seismic slip along a master décollement?

Research Article| July 01, 2003 Pseudotachylyte from an ancient accretionary complex: Evidence for melt generation during seismic slip along a master décollement? E. Ikesawa; E. Ikesawa 1Department of Earth and Planetary Science, University of Tokyo, Tokyo 113-0033, Japan Search for other works by this author on: GSW Google Scholar A. Sakaguchi; A. Sakaguchi 2Institute of Frontier Research on Earth Evolution, Japan Marine Science and Technology Center, Yokosuka 237-0061, Japan Search for other works by this author on: GSW Google Scholar G. Kimura G. Kimura 3Department of Earth and Planetary Science, University of Tokyo, Tokyo 113-0033, Japan, and Institute of Frontier Research on Earth Evolution, Japan Marine Science and Technology Center, Yokosuka 237-0061, Japan Search for other works by this author on: GSW Google Scholar Author and Article Information E. Ikesawa 1Department of Earth and Planetary Science, University of Tokyo, Tokyo 113-0033, Japan A. Sakaguchi 2Institute of Frontier Research on Earth Evolution, Japan Marine Science and Technology Center, Yokosuka 237-0061, Japan G. Kimura 3Department of Earth and Planetary Science, University of Tokyo, Tokyo 113-0033, Japan, and Institute of Frontier Research on Earth Evolution, Japan Marine Science and Technology Center, Yokosuka 237-0061, Japan Publisher: Geological Society of America Received: 10 Jan 2003 Revision Received: 04 Apr 2003 Accepted: 05 Apr 2003 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2003) 31 (7): 637–640. https://doi.org/10.1130/0091-7613(2003)031<0637:PFAAAC>2.0.CO;2 Article history Received: 10 Jan 2003 Revision Received: 04 Apr 2003 Accepted: 05 Apr 2003 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation E. Ikesawa, A. Sakaguchi, G. Kimura; Pseudotachylyte from an ancient accretionary complex: Evidence for melt generation during seismic slip along a master décollement?. Geology 2003;; 31 (7): 637–640. doi: https://doi.org/10.1130/0091-7613(2003)031<0637:PFAAAC>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 SocietyGeology Search Advanced Search Abstract Pseudotachylyte is present in the Shimanto accretionary complex in Shikoku, Japan. The pseudotachylyte occurs as a vein in a fault zone and displays flow structure, TiO2 microlites, and other melting-related textures. The mineral assemblage of the pseudotachylyte suggests that the temperature was raised at least 450 °C above the background levels in the host rocks. This is the first direct evidence of seismogenic fault rock from an accretionary complex. The pseudotachylyte-bearing fault is a roof thrust above underthrusted mélange, which is overlain by an offscraped package of coherent units. The geologic setting of the pseudotachylyte is consistent with melt generation during seismic slip along the master décollement in the subduction zone. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.