First field-scale occurrence of Si-Al-Na–rich low-degree partial melts from the upper mantle

Abstract

Research Article| May 01, 2001 First field-scale occurrence of Si-Al-Na–rich low-degree partial melts from the upper mantle C. Pin; C. Pin 1Département de Géologie, U.M.R. 6524 CNRS, Université Blaise Pascal 5, rue Kessler, 63038 Clermont-Ferrand Cedex, France Search for other works by this author on: GSW Google Scholar J.L. Paquette; J.L. Paquette 1Département de Géologie, U.M.R. 6524 CNRS, Université Blaise Pascal 5, rue Kessler, 63038 Clermont-Ferrand Cedex, France Search for other works by this author on: GSW Google Scholar P. Monchoux; P. Monchoux 2Laboratoire de Minéralogie, Université Paul Sabatier 39, allées Jules Guesdes, 31000 Toulouse, France Search for other works by this author on: GSW Google Scholar T. Hammouda T. Hammouda 3Département de Géologie, U.M.R. 6524 CNRS, Université Blaise Pascal 5, rue Kessler, 63038 Clermont-Ferrand Cedex, France Search for other works by this author on: GSW Google Scholar Author and Article Information C. Pin 1Département de Géologie, U.M.R. 6524 CNRS, Université Blaise Pascal 5, rue Kessler, 63038 Clermont-Ferrand Cedex, France J.L. Paquette 1Département de Géologie, U.M.R. 6524 CNRS, Université Blaise Pascal 5, rue Kessler, 63038 Clermont-Ferrand Cedex, France P. Monchoux 2Laboratoire de Minéralogie, Université Paul Sabatier 39, allées Jules Guesdes, 31000 Toulouse, France T. Hammouda 3Département de Géologie, U.M.R. 6524 CNRS, Université Blaise Pascal 5, rue Kessler, 63038 Clermont-Ferrand Cedex, France Publisher: Geological Society of America Received: 10 Aug 2000 Revision Received: 29 Jan 2001 Accepted: 30 Jan 2001 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2001) 29 (5): 451–454. https://doi.org/10.1130/0091-7613(2001)029<0451:FFSOOS>2.0.CO;2 Article history Received: 10 Aug 2000 Revision Received: 29 Jan 2001 Accepted: 30 Jan 2001 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 C. Pin, J.L. Paquette, P. Monchoux, T. Hammouda; First field-scale occurrence of Si-Al-Na–rich low-degree partial melts from the upper mantle. Geology 2001;; 29 (5): 451–454. doi: https://doi.org/10.1130/0091-7613(2001)029<0451:FFSOOS>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 Felsic dikes intruding an orogenic lherzolite body from the North Pyrenean zone (France) show great compositional similarities to some of the Si-Al-Na(K)–rich glasses found as microscopic inclusions in peridotite xenoliths. As shown by Sr-Nd isotopes, these silicic magmas originated from a mantle reservoir that was moderately depleted on a time- integrated basis. Their Si-Al-Na–rich bulk compositions match closely those predicted by experimental studies relevant to near-solidus melting of mantle peridotite. Specifically, the dikes are closely similar to low-degree melts from sodic harzburgite. On this basis, an olivine-orthopyroxene source that had been metasomatized by addition of sodic-carbonatite melts is inferred, as also suggested by peculiar trace element features (extreme fractionation of the light rare earth elements, high Nb contents). This new occurrence lends support to the existence of high-silica liquids in the mantle and provides evidence for their efficient extraction to form relatively large batches. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.