Title: Geology and geochemistry of the alkali basalt—andesite association of Grenada, Lesser Antilles island arc
Abstract: Research Article| April 01, 1976 Geology and geochemistry of the alkali basalt—andesite association of Grenada, Lesser Antilles island arc RICHARD J. ARCULUS RICHARD J. ARCULUS 1Department of Geological Sciences, University of Durham, Durham, England Search for other works by this author on: GSW Google Scholar Author and Article Information RICHARD J. ARCULUS 1Department of Geological Sciences, University of Durham, Durham, England Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1976) 87 (4): 612–624. https://doi.org/10.1130/0016-7606(1976)87<612:GAGOTA>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 RICHARD J. ARCULUS; Geology and geochemistry of the alkali basalt—andesite association of Grenada, Lesser Antilles island arc. GSA Bulletin 1976;; 87 (4): 612–624. doi: https://doi.org/10.1130/0016-7606(1976)87<612:GAGOTA>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 Basanitoids and alkalic basalts that are strongly undersaturated in silica occur on the island of Grenada in the Lesser Antilles. Several volcanic centers have erupted basic lava of these compositions together with subalkalic basalt, andesite, and dacite from Miocene to Holocene time. The volcanic rocks overlie a folded volcanic-sedimentary formation of Eocene to Miocene age. Tuff rings and maars of explosive origin are present. Andesite and dacite are less significant volumetrically on Grenada in comparison with other islands in the Lesser Antilles.The variable trace-element geochemistry of the basanitoids and alkalic basalts is related, on the basis of rare-earth-element data, to a model of variable degrees of partial melting of an upper-mantle garnet peridotite source. It is suggested that fractional crystallization of olivine, clinopyroxene, and spinel, observed as the phenocryst assemblage in the basanitoids and alkalic basalts, takes place at high temperatures; at lower temperatures, these phenocrysts are joined by amphibole and plagioclase. A trend toward increased silica saturation is the result of this fractional crystallization process. The presence of alkalic lava rocks together with variable trace-element abundances and Sr isotope ratios are unusual features of the volcanicity. 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.
Publication Year: 1976
Publication Date: 1976-01-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 119
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