Enriched component of the proto-Icelandic mantle plume revealed in alkaline Tertiary lavas from East Greenland

Abstract

Research Article| September 01, 2001 Enriched component of the proto-Icelandic mantle plume revealed in alkaline Tertiary lavas from East Greenland Stefan Bernstein; Stefan Bernstein 1Arktisk Station, University of Copenhagen and Danish Lithosphere Centre, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark Search for other works by this author on: GSW Google Scholar C. Kent Brooks; C. Kent Brooks 2Geological Institute, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark Search for other works by this author on: GSW Google Scholar Ole Stecher Ole Stecher 3Danish Lithosphere Centre, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark Search for other works by this author on: GSW Google Scholar Author and Article Information Stefan Bernstein 1Arktisk Station, University of Copenhagen and Danish Lithosphere Centre, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark C. Kent Brooks 2Geological Institute, University of Copenhagen, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark Ole Stecher 3Danish Lithosphere Centre, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark Publisher: Geological Society of America Received: 18 Dec 2000 Revision Received: 03 May 2001 Accepted: 21 May 2001 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2001) 29 (9): 859–862. https://doi.org/10.1130/0091-7613(2001)029<0859:ECOTPI>2.0.CO;2 Article history Received: 18 Dec 2000 Revision Received: 03 May 2001 Accepted: 21 May 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 Stefan Bernstein, C. Kent Brooks, Ole Stecher; Enriched component of the proto-Icelandic mantle plume revealed in alkaline Tertiary lavas from East Greenland. Geology 2001;; 29 (9): 859–862. doi: https://doi.org/10.1130/0091-7613(2001)029<0859:ECOTPI>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 Alkaline ultramafic lavas in north East Greenland were contemporaneous with Tertiary tholeiitic flood basalts in East Greenland. The alkaline lavas are enriched in light rare earth elements (REEs) and Ti and Nb, but depleted in Rb, Ba, K, Th, and P. The flood basalts have trace element profiles similar to those of the alkaline lavas. These features are not caused by fractional crystallization or crustal contamination and are thus regarded as inherited from the mantle source. The trace element profiles and Sr and Nd isotopic compositions of the flood basalts are shown to be consistent with a simple model, in which 5%–10% alkaline melt is mixed into normal-mid-ocean ridge basalt. This alkaline melt has a composition reflecting low-degree melting at high pressures of incompatible element– enriched mantle. In areas where only deep melting occurred, this enriched melt component reached the surface in an essentially undiluted form. Elsewhere, under the rift axis, it mixed with asthenospheric melts, resulting in the typical enriched characteristics of East Greenland flood basalts. The presence of pronounced negative P anomalies in modern Iceland lavas suggests this to be a long-term feature of the Iceland mantle plume. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.