Time-predictable bimodal volcanism in the Coso Range, California

Abstract

Research Article| February 01, 1982 Time-predictable bimodal volcanism in the Coso Range, California Charles R. Bacon Charles R. Bacon 1U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Author and Article Information Charles R. Bacon 1U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1982) 10 (2): 65–69. https://doi.org/10.1130/0091-7613(1982)10<65:TBVITC>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 Charles R. Bacon; Time-predictable bimodal volcanism in the Coso Range, California. Geology 1982;; 10 (2): 65–69. doi: https://doi.org/10.1130/0091-7613(1982)10<65:TBVITC>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 The bimodal Pleistocene part of the Coso volcanic field has erupted rhyolite and basalt at constant long-term rates during the past ∼0.5 m.y. Both basalt and high-silica rhyolite were erupted in several independent, geologically brief episodes. The interval between eruptions of rhyolite was proportional to the volume of the preceding eruption. Basaltic eruptions appear to have followed a similar pattern. These time-predictable relations would be expected if (1) extensional strain accumulates in roof rocks at a constant rate, (2) the accumulated strain is relieved by near-vertical fractures, which serve as conduits for eruptions, and (3) the volume of erupted material is proportional to the sum of the conduit (dike) widths. The long-term eruption rate of rhyolite is about 5.4 km3/m.y.; that of basalt is about 2.8 km3/m.y. These rates are less than those of magma supply inferred from heat-flow and petrologic arguments by factors of between 100 and 200. 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.