Shishaldin Volcano: Aleutian high-alumina basalts and the question of plagioclase accumulation

Abstract

Research Article| March 01, 1991 Shishaldin Volcano: Aleutian high-alumina basalts and the question of plagioclase accumulation John Fournelle; John Fournelle 1Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218 Search for other works by this author on: GSW Google Scholar Bruce D. Marsh Bruce D. Marsh 1Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218 Search for other works by this author on: GSW Google Scholar Author and Article Information John Fournelle 1Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218 Bruce D. Marsh 1Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, Maryland 21218 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1991) 19 (3): 234–237. https://doi.org/10.1130/0091-7613(1991)019<0234:SVAHAB>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 John Fournelle, Bruce D. Marsh; Shishaldin Volcano: Aleutian high-alumina basalts and the question of plagioclase accumulation. Geology 1991;; 19 (3): 234–237. doi: https://doi.org/10.1130/0091-7613(1991)019<0234:SVAHAB>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 High-alumina basalts (HABs) from volcanic arcs commonly contain 30%-50% (modal) plagioclase. It has been suggested that they reflect plagioclase addition and are not primary compositions. In rocks from the Aleutian volcano Shishaldin, we search for evidence of plagioclase accumulation: A12O3, CaO, and Na2O vs. modal plagioclase; europium anomalies in HABs; plagioclase-liquid equilibrium; and the HAB groundmass. The HABs do not appear to be results of plagioclase addition to liquids of dacitic, Fe-Ti-enriched, or high-Mg basaltic compositions. Plagioclase loss from HABs does appear to yield the Fe-Ti-enriched basalts. Shishaldin HABs may reflect near-primary compositions, and HAB phase equilibria may thus be useful in evaluating the origin of such are basalts. 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.