Consistent olivine Mg# in cratonic mantle reflects Archean mantle melting to the exhaustion of orthopyroxene

Abstract

Research Article| May 01, 2007 Consistent olivine Mg# in cratonic mantle reflects Archean mantle melting to the exhaustion of orthopyroxene Stefan Bernstein; Stefan Bernstein 1Geological Survey of Denmark and Greenland, øster Voldgade 10, DK-1350 Copenhagen, Denmark Search for other works by this author on: GSW Google Scholar Peter B. Kelemen; Peter B. Kelemen 2Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York 10964, USA Search for other works by this author on: GSW Google Scholar Karen Hanghøj Karen Hanghøj 2Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York 10964, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Stefan Bernstein 1Geological Survey of Denmark and Greenland, øster Voldgade 10, DK-1350 Copenhagen, Denmark Peter B. Kelemen 2Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York 10964, USA Karen Hanghøj 2Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York 10964, USA Publisher: Geological Society of America Received: 06 Sep 2006 Revision Received: 05 Jan 2007 Accepted: 10 Jan 2007 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2007) 35 (5): 459–462. https://doi.org/10.1130/G23336A.1 Article history Received: 06 Sep 2006 Revision Received: 05 Jan 2007 Accepted: 10 Jan 2007 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Stefan Bernstein, Peter B. Kelemen, Karen Hanghøj; Consistent olivine Mg# in cratonic mantle reflects Archean mantle melting to the exhaustion of orthopyroxene. Geology 2007;; 35 (5): 459–462. doi: https://doi.org/10.1130/G23336A.1 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 Shallow (garnet-free), depleted cratonic mantle, occurring as xenoliths in kimberlites and alkaline basaltic lavas, has a high Mg# (100 × Mg/(Mg + Fe) > 92) and is poor in Al and Ca compared to off-cratonic mantle. Here we compile data for many suites of shallow cratonic mantle xenoliths worldwide, and demonstrate a remarkably small range in their olivine Mg#, with an average of ≈92.8. Via comparison with data for experimental melting of mantle peridotite compositions, we explain consistent olivine Mg# as the result of mantle melting and melt extraction to the point of orthopyroxene exhaustion, leaving a nearly monomineralic olivine residue. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.