Post–middle Miocene accretion of Franciscan rocks, northwestern California

Research Article| July 01, 1982 Post–middle Miocene accretion of Franciscan rocks, northwestern California ROBERT J. McLAUGHLIN; ROBERT J. McLAUGHLIN 1U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar STANLEY A. KLING; STANLEY A. KLING 1U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar RICHARD Z. POORE; RICHARD Z. POORE 1U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar KRISTIN McDOUGALL; KRISTIN McDOUGALL 1U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar EDWARD C. BEUTNER EDWARD C. BEUTNER 2Franklin and Marshall College, Lancaster, Pennsylvania 17604 Search for other works by this author on: GSW Google Scholar Author and Article Information ROBERT J. McLAUGHLIN 1U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 STANLEY A. KLING 1U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 RICHARD Z. POORE 1U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 KRISTIN McDOUGALL 1U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 EDWARD C. BEUTNER 2Franklin and Marshall College, Lancaster, Pennsylvania 17604 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1982) 93 (7): 595–605. https://doi.org/10.1130/0016-7606(1982)93<595:PMAOFR>2.0.CO;2 Article history First Online: 01 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 ROBERT J. McLAUGHLIN, STANLEY A. KLING, RICHARD Z. POORE, KRISTIN McDOUGALL, EDWARD C. BEUTNER; Post–middle Miocene accretion of Franciscan rocks, northwestern California. GSA Bulletin 1982;; 93 (7): 595–605. doi: https://doi.org/10.1130/0016-7606(1982)93<595:PMAOFR>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 Deformed sedimentary rocks assigned to the Franciscan assemblage in the King Range south of Cape Mendocino, northern California, are dominantly deep-water argillite and sandstone occurring as thick- to thin-bedded, locally channelized marine turbidites of arkosic to andesitic volcani-clastic composition. These rocks structurally overlie Late Cretaceous (Coniacian to Campanian) basaltic pillow flows, flow breccias, diabase sills, and arkosic sandstone turbidites that also are assignable to the Franciscan assemblage, and are well exposed along the coast at Point Delgada.Radiolarians and planktic and benthic foraminifers indicate that the oldest rocks in the King Range may be early Tertiary and that the youngest rocks are middle Miocene or younger, the youngest rocks yet reported from the Franciscan assemblage.Partly coeval Miocene (Relizian and Luisian) to Quaternary rocks, representing shallower sedimentary facies of the inner shelf to outer continental slope, occupy the Eel River basin and isolated fault-bounded slivers adjacent to the King Range on the north and east. Wide zones of penetrative shearing that may delineate a middle Miocene or younger suture separate the deep-water Franciscan rocks of the King Range from less severely deformed Neogene rocks of the Eel River basin.The King Range appears to be a displaced terrane of oceanic basement overlain by Paleogene(?) and Neogene sedimentary and igneous rocks of continental and oceanic derivation. This terrane may have been displaced north or eastward and obductively accreted to California ≤15 m.y. ago, before or perhaps during northward passage of the Pacific-Farallon-North American plate junction. 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.