Mahukona: The missing Hawaiian volcano

Abstract

Research Article| November 01, 1990 Mahukona: The missing Hawaiian volcano Michael O. Garcia; Michael O. Garcia 1Department of Geology and Geophysics, University of Hawaii, Honolulu, Hawaii 96822 Search for other works by this author on: GSW Google Scholar Mark D. Kurz; Mark D. Kurz 2Chemistry Department, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543 Search for other works by this author on: GSW Google Scholar David W. Muenow David W. Muenow 3Chemistry Department and Hawaii Institute of Geophysics, University of Hawaii, Honolulu, Hawaii 96822 Search for other works by this author on: GSW Google Scholar Author and Article Information Michael O. Garcia 1Department of Geology and Geophysics, University of Hawaii, Honolulu, Hawaii 96822 Mark D. Kurz 2Chemistry Department, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543 David W. Muenow 3Chemistry Department and Hawaii Institute of Geophysics, University of Hawaii, Honolulu, Hawaii 96822 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1990) 18 (11): 1111–1114. https://doi.org/10.1130/0091-7613(1990)018<1111:MTMHV>2.3.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 Michael O. Garcia, Mark D. Kurz, David W. Muenow; Mahukona: The missing Hawaiian volcano. Geology 1990;; 18 (11): 1111–1114. doi: https://doi.org/10.1130/0091-7613(1990)018<1111:MTMHV>2.3.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 New bathymetric and geochemical data indicate that a seamount west of the island of Hawaii, Mahukona, is a Hawaiian shield volcano. Mahukona has weakly alkalic lavas that are geochemically distinct. They have high 3He/4He ratios (12-21 times atmosphere), and high H2O and Cl contents, which are indicative of the early stage of development of Hawaiian volcanoes. The He and Sr isotopic values for Mahukona lavas are intermediate between those for lavas from Loihi and Mauna Loa volcanoes and may be indicative of a temporal evolution of Hawaiian magmas. Mahukona volcano became extinct at about 500 ka, perhaps before reaching sea level. It fdls the previously assumed gap in the parallel chains of volcanoes forming the southern segment of the Hawaiian hotspot chain. The paired sequence of volcanoes was probably caused by the bifurcation of the Hawaiian mantle plume during its ascent, creating two primary areas of melting 30 to 40 km apart that have persisted for at least the past 4 m.y. 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.