Existence of complex spatial zonation in the Galápagos plume

Abstract

Research Article| May 01, 2000 Existence of complex spatial zonation in the Galápagos plume Kaj Hoernle; Kaj Hoernle 1GEOMAR, Wischhofstrasse 1-3, 24148-Kiel, Germany Search for other works by this author on: GSW Google Scholar Reinhard Werner; Reinhard Werner 1GEOMAR, Wischhofstrasse 1-3, 24148-Kiel, Germany Search for other works by this author on: GSW Google Scholar Jason Phipps Morgan; Jason Phipps Morgan 1GEOMAR, Wischhofstrasse 1-3, 24148-Kiel, Germany Search for other works by this author on: GSW Google Scholar Dieter Garbe-Schönberg; Dieter Garbe-Schönberg 2Institute for Geosciences, University of Kiel, 24148-Kiel, Germany Search for other works by this author on: GSW Google Scholar Julie Bryce; Julie Bryce 3University of California, Santa Barbara, California 93106, USA Search for other works by this author on: GSW Google Scholar Johann Mrazek Johann Mrazek 4University Greifswald, 17489-Greifswald, Germany Search for other works by this author on: GSW Google Scholar Author and Article Information Kaj Hoernle 1GEOMAR, Wischhofstrasse 1-3, 24148-Kiel, Germany Reinhard Werner 1GEOMAR, Wischhofstrasse 1-3, 24148-Kiel, Germany Jason Phipps Morgan 1GEOMAR, Wischhofstrasse 1-3, 24148-Kiel, Germany Dieter Garbe-Schönberg 2Institute for Geosciences, University of Kiel, 24148-Kiel, Germany Julie Bryce 3University of California, Santa Barbara, California 93106, USA Johann Mrazek 4University Greifswald, 17489-Greifswald, Germany Publisher: Geological Society of America Received: 01 Jun 1999 Revision Received: 31 Jan 2000 Accepted: 11 Feb 2000 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2000) 28 (5): 435–438. https://doi.org/10.1130/0091-7613(2000)28<435:EOCSZI>2.0.CO;2 Article history Received: 01 Jun 1999 Revision Received: 31 Jan 2000 Accepted: 11 Feb 2000 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Kaj Hoernle, Reinhard Werner, Jason Phipps Morgan, Dieter Garbe-Schönberg, Julie Bryce, Johann Mrazek; Existence of complex spatial zonation in the Galápagos plume. Geology 2000;; 28 (5): 435–438. doi: https://doi.org/10.1130/0091-7613(2000)28<435:EOCSZI>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 Basalts from intraplate or hotspot ocean islands (e.g., the Hawaiian, Galápagos, and Canary Islands) are believed to be formed by mantle plumes, which emanate from mantle boundary layers such as the core-mantle boundary. The long-term chemical structure of mantle plumes, however, remains poorly constrained. Spatial variation in the chemical composition has long been recognized in lavas from the Galápagos Islands: Enriched plume material forms a horseshoe-shaped region with depleted mantle, similar in composition to mid-ocean ridge basalt, in its inner part. The enriched horseshoe-shaped region can be subdivided into three distinct geochemical domains. We show that these same domains occur in the same relative positions with respect to morphology in a geochemical profile across the Galápagos hotspot track off the coast of Costa Rica, indicating that the asymmetrical spatial zonation of the Galápagos hotspot has existed for at least 14 m.y. Combined with published He isotope data, the results of this study imply that plume material can ascend from the lower mantle, possibly from the core-mantle boundary, with little stirring occurring during ascent, and that zonation in hotspot lavas may in some cases reflect spatial heterogeneity within the lower mantle source. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.