RHUM-RUM - Seismological Imaging of a Mantle Plume under La Réunion, Western Indian Ocean - Cruise No. M101 - October 23 - December 4, 2013 - Port Louis (Mauritius) - Le Port (La Réunion, France)

Freier Zugriff
in METEOR-Berichte; M101; 1-39; METEOR-Berichte

Dokumentinformationen

  • Format / Umfang:
    39 pages
  • ISSN:
  • DOI:
  • Medientyp:
    Aufsatz (Zeitschrift)
  • Format:
    Elektronische Ressource
  • Sprache:
    Englisch
  • Klassifikation:
    DDC:    550 Earth sciences and geology

Abstract

La Réunion Island in the western Indian Ocean is among the most active volcanoes in the world and a very strong candidate for a hot spot underlain by a deep, "classical" mantle plume. The German- French project RHUM-RUM (Réunion Hotspot and Upper Mantle-Réunions Unterer Mantel) aims to seismologically image the crust and mantle under the island at all depths. We want to help settle the first-order question of whether deep mantle plumes exist and are important to the solid earth's heat budget. RHUM-RUM the largest attempt so far to seismologically image an oceanic mantle plume. During R/V METEOR cruise M101, we successfully recovered all 57 ocean-bottom seismometers that we had deployed over an area of 1500 × 2000 square kilometers one year earlier, during cruise MD192 of the Réunion-based research vessel MARION DUFRESNE. We continuously acquired multi-swath bathymetry and sea-surface magnetic data along our 15,000-km long cruise track of largely unmapped ocean floor. This included four dedicated, exploratory profiles around Mauritius and the Central and Southwest Indian spreading ridges, targeted at specific tectonic questions. A social highlight was the serendipitous meeting with R/V SONNE on the Central Indian Ridge during the ship's last year of service.