Offset Plutons and History of Movement along the McKinley Segment of the Denali Fault System, Alaska

Research Article| December 01, 1974 Offset Plutons and History of Movement along the McKinley Segment of the Denali Fault System, Alaska BRUCE L. REED; BRUCE L. REED 1U.S. Geological Survey, Anchorage, Alaska 99501 Search for other works by this author on: GSW Google Scholar MARVIN A. LANPHERE MARVIN A. LANPHERE 2U.S. Geological Survey, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Author and Article Information BRUCE L. REED 1U.S. Geological Survey, Anchorage, Alaska 99501 MARVIN A. LANPHERE 2U.S. Geological Survey, Menlo Park, California 94025 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1974) 85 (12): 1883–1892. https://doi.org/10.1130/0016-7606(1974)85<1883:OPAHOM>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 BRUCE L. REED, MARVIN A. LANPHERE; Offset Plutons and History of Movement along the McKinley Segment of the Denali Fault System, Alaska. GSA Bulletin 1974;; 85 (12): 1883–1892. doi: https://doi.org/10.1130/0016-7606(1974)85<1883:OPAHOM>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 The Foraker and McGonagall plutons, bodies of granodiorite with nearly identical mineralogy and chemistry, are considered to be parts of a single igneous mass that has undergone right-lateral displacement of about 38 km along the McKinley segment of the Denali fault system since the igneous mass crystallized about 38 m.y. ago. These offset plutons place severe constraints on the amount and rate of movement along the McKinley segment since the beginning of the Oligocene Epoch. The 38-km displacement indicates an average rate of 0.1 cm/yr if movement began immediately after crystallization in early Oligocene time or an average rate of 0.4 cm/yr if movement began 10 m.y. ago in late Miocene time. These rates, however, are considerably less than Holocene movement rates measured along the fault further to the east, which suggests that the Holocene displacement rate is greater than the pre-Holocene rate or that right-lateral movement along the fault may diminish to the west. 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.