Partial melts of subducted phosphatic sediments in the mantle

Abstract

Research Article| January 01, 1997 Partial melts of subducted phosphatic sediments in the mantle Jeffrey M. Rosenbaum; Jeffrey M. Rosenbaum 1Department of Earth Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom Search for other works by this author on: GSW Google Scholar Marjorie Wilson; Marjorie Wilson 1Department of Earth Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom Search for other works by this author on: GSW Google Scholar Eric Condliffe Eric Condliffe 1Department of Earth Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom Search for other works by this author on: GSW Google Scholar Geology (1997) 25 (1): 77–80. https://doi.org/10.1130/0091-7613(1997)025<0077:PMOSPS>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 Jeffrey M. Rosenbaum, Marjorie Wilson, Eric Condliffe; Partial melts of subducted phosphatic sediments in the mantle. Geology 1997;; 25 (1): 77–80. doi: https://doi.org/10.1130/0091-7613(1997)025<0077:PMOSPS>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 Two types of grain-boundary glasses, one phosphorous rich and the other phosphorous poor, have been discovered during a detailed electron- and ion-microprobe study of spinel peridotite xenoliths exhumed from the mantle lithosphere of the Massif Central by Neogene alkali basalts. The high-P glasses are SiO2 poor and enriched in CaO, rare earth elements (REEs), Ba, U, and Rb and have large negative Ce anomalies on chondrite-normalized REE plots. The low-P glasses are SiO2 rich and have variable major and trace element compositions reflecting mixing between in situ partial melts of the host mantle and the high-P melt. The major and trace element compositions of the P-rich glasses strongly resemble those of phosphatic sediments and suggest their derivation by partial melting of a sedimentary protolith subducted under the Massif Central during the Hercynian orogeny. Selective assimilation of similar P-rich melt veins from the lithospheric mantle may account for the high-P contents of some Tertiary-Quaternary basalts from the Massif Central. 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.