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- W2053885107 abstract "Research Article| October 01, 1983 Natrocarbonatite tephra of Kerimasi volcano, Tanzania Richard L. Hay Richard L. Hay 1Department of Geology, University of Illinois, 1301 West Green Street, Urbana, Illinois 61801 Search for other works by this author on: GSW Google Scholar Author and Article Information Richard L. Hay 1Department of Geology, University of Illinois, 1301 West Green Street, Urbana, Illinois 61801 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1983) 11 (10): 599–602. https://doi.org/10.1130/0091-7613(1983)11<599:NTOKVT>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 L. Hay; Natrocarbonatite tephra of Kerimasi volcano, Tanzania. Geology 1983;; 11 (10): 599–602. doi: https://doi.org/10.1130/0091-7613(1983)11<599:NTOKVT>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 Carbonatite tephra was discharged in the final eruptive phase of Kerimasi, an extinct nephelinite volcano in the eastern rift valley of northern Tanzania. The tephra was dominantly of alkali carbonatite composition, thus providing the first well-documented example of premodern natrocarbonatite volcanism. The principal carbonate mineral was nyerereite, which is the dominant mineral in modern natrocarbonatite lava flows of the adjacent volcano Oldoinyo Lengai. The nyerereite of Kerimasi was leached of its alkalis by meteoric water and is now represented by calcite pseudomorphs. Natrocarbonatite tephra of Kerimasi shows that the alkali-rich eruptive rocks of Oldoinyo Lengai are not unique, thus supporting the hypothesis that carbonatite magmas associated with nephelinite volcanism were originally alkaline and that the subvolcanic calcitic carbonatites are a residuum from which the alkalis have been removed, either by volcanism or fenetizing fluids. A hypothesis to be tested is that eruptive carbonatite magma is, worldwide, commonly and perhaps dominantly of natrocarbonatite composition. 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." @default.
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- W2053885107 title "Natrocarbonatite tephra of Kerimasi volcano, Tanzania" @default.
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