Research Article| June 01, 1991 Nd and Sr isotope systematics of Shombole volcano, East Africa, and the links between nephelinites, phonolites, and carbonatites Keith Bell; Keith Bell 1Ottawa-Carleton Geoscience Centre, Department of Earth Sciences, Carleton University, Ottawa K1S 5B6, Canada Search for other works by this author on: GSW Google Scholar Tony Peterson Tony Peterson 2Geological Survey of Canada, 588 Booth Street, Ottawa K1A 0E4, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Keith Bell 1Ottawa-Carleton Geoscience Centre, Department of Earth Sciences, Carleton University, Ottawa K1S 5B6, Canada Tony Peterson 2Geological Survey of Canada, 588 Booth Street, Ottawa K1A 0E4, Canada 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 (6): 582–585. https://doi.org/10.1130/0091-7613(1991)019<0582:NASISO>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 Keith Bell, Tony Peterson; Nd and Sr isotope systematics of Shombole volcano, East Africa, and the links between nephelinites, phonolites, and carbonatites. Geology 1991;; 19 (6): 582–585. doi: https://doi.org/10.1130/0091-7613(1991)019<0582:NASISO>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 Nd and Sr isotope compositions of nephelinites, carbonatites, and phonolites from Shombole, a Pliocene volcano in East Africa, show that the phonolites cannot be derived by simple fractional crystallization of nephelinite magma. For a given initial 87Sr/86Sr ratio, 143Nd/144Nd is lower in most phonolites than in the nephelinites and carbonatites. Interaction between nephelinitic magma and lower-crustal granulites can account for these differences. The similar ranges in isotopic composition of the carbonatites and nephefinites are consistent with repeated melting events involving heterogeneous mantle. The carbonatites could have formed by immiscibility with nephelinite magma or by direct partial melting of the same mantle source(s) as the nephelinites. 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.
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Bell et al. (1991) studied this question.