Isotopic disequilibrium in clinopyroxenes from nephelinitic lavas, Napak volcano, eastern Uganda

Research Article| March 01, 1993 Isotopic disequilibrium in clinopyroxenes from nephelinitic lavas, Napak volcano, eastern Uganda Antonio Simonetti; Antonio Simonetti 1Ottawa-Carleton Geoscience Centre, Department of Earth Sciences, Carleton University, Ottawa, Ontario K1S 5B6, Canada Search for other works by this author on: GSW Google Scholar Keith Bell Keith Bell 1Ottawa-Carleton Geoscience Centre, Department of Earth Sciences, Carleton University, Ottawa, Ontario K1S 5B6, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Antonio Simonetti 1Ottawa-Carleton Geoscience Centre, Department of Earth Sciences, Carleton University, Ottawa, Ontario K1S 5B6, Canada Keith Bell 1Ottawa-Carleton Geoscience Centre, Department of Earth Sciences, Carleton University, Ottawa, Ontario K1S 5B6, Canada Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1993) 21 (3): 243–246. https://doi.org/10.1130/0091-7613(1993)021<0243:IDICFN>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 Email Permissions Search Site Citation Antonio Simonetti, Keith Bell; Isotopic disequilibrium in clinopyroxenes from nephelinitic lavas, Napak volcano, eastern Uganda. Geology 1993;; 21 (3): 243–246. doi: https://doi.org/10.1130/0091-7613(1993)021<0243:IDICFN>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 Pyroxene phenocrysts from nephelinites associated with the Tertiary carbonatite-nephelinite Napak volcano are not in isotopic equilibrium with their host rocks and reveal a complicated evolutionary history that involved fractional crystallization of a melt undergoing continuous isotopic change. Intrasample pyroxene populations have different isotopic compositions and are interpreted as earlier formed pyroxenes that failed to isotopically equilibrate with the host liquids and that were later scavenged by ascending melts. The Napak data show that the pyroxenes can be effective in monitoring isotopic shifts that occur during magma evolution. 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.