Multistage melange formation in the Franciscan Complex, northernmost California

Research Article| December 01, 1981 Multistage melange formation in the Franciscan Complex, northernmost California K. R. Aalto K. R. Aalto 1Department of Geology, Humboldt State University, Arcata, California 95521 Search for other works by this author on: GSW Google Scholar Author and Article Information K. R. Aalto 1Department of Geology, Humboldt State University, Arcata, California 95521 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1981) 9 (12): 602–607. https://doi.org/10.1130/0091-7613(1981)9<602:MMFITF>2.0.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 K. R. Aalto; Multistage melange formation in the Franciscan Complex, northernmost California. Geology 1981;; 9 (12): 602–607. doi: https://doi.org/10.1130/0091-7613(1981)9<602:MMFITF>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 Matrix induration and deformation style denote relative time and process of melange origin related to subduction. Mappable melange units contain chiefly blocks of greenstone, chert, and graywacke dispersed in weakly indurated argillite. Emplacement of these units as olistostromes is indicated by depositional contacts and lateral inter-tonguing with turbidites.Some blocks in sheared olistostromes are in themselves complexly mixed. These include breccias of gabbro, plagiogranite, diabase, basalt, tuff, chert, graywacke, and argillite variously combined and brittlely deformed. Blocks of intercalated tuff and argillite and of diamictite containing rounded clasts of tuff, chert, and graywacke dispersed in highly indurated, foliated argillite exhibit primary ductile and secondary brittle deformation. All block material was indurated, brecciated, and/or foliated during underplating at the base of a trench slope and later uplifted to provide olistostrome detritus.The Elk Head and Klamath coast terranes are highly indurated and compositionally similar to the mixed-lithology blocks in olistostromes. They are interpreted to form an accretionary prism consisting of tectonic melange slabs separating slope-basin rocks. 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.