Initial impingement of the Yellowstone plume located by widespread silicic volcanism contemporaneous with Columbia River flood basalts

Abstract

Research Article| July 01, 2012 Initial impingement of the Yellowstone plume located by widespread silicic volcanism contemporaneous with Columbia River flood basalts Matthew A. Coble; Matthew A. Coble * Department of Geological and Environmental Sciences, Stanford University, 450 Serra Mall, Stanford, California 94305-2115, USA *E-mail: coblem@stanford.edu. Search for other works by this author on: GSW Google Scholar Gail A. Mahood Gail A. Mahood Department of Geological and Environmental Sciences, Stanford University, 450 Serra Mall, Stanford, California 94305-2115, USA Search for other works by this author on: GSW Google Scholar Geology (2012) 40 (7): 655–658. https://doi.org/10.1130/G32692.1 Article history received: 27 Jul 2011 rev-recd: 01 Feb 2012 accepted: 13 Feb 2012 first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Matthew A. Coble, Gail A. Mahood; Initial impingement of the Yellowstone plume located by widespread silicic volcanism contemporaneous with Columbia River flood basalts. Geology 2012;; 40 (7): 655–658. doi: https://doi.org/10.1130/G32692.1 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 During the main phase of Steens and Columbia River (United States) flood basalt eruptions between 16.7 and 15.0 Ma, ∼3900 km3 of silicic magma erupted from centers dispersed across ∼25,000 km2. The largest and oldest silicic centers, High Rock, McDermitt, and Lake Owyhee caldera complexes, lie along a narrow NNE trend at the transition between the craton and accreted oceanic crust, suggesting that silicic magma generation was greatest where mafic magma intruded more-felsic crust. Less voluminous and younger silicic centers track the spread of mafic dikes to the north. The High Rock caldera complex forms the western end of the Snake River Plain–Yellowstone trend of eastward-younging silicic centers. We attribute a regional lull in volcanism between ca. 23 and 7 Ma to lifting of the Juan de Fuca slab by a mantle plume beginning at ca. 25 Ma, and the distribution of main-stage flood basalts and coeval rhyolites to breakthrough of plume material at ca. 17 Ma to form a smaller plume head centered beneath Steens Mountain. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.