The Rio Grande Rise and Jean Charcot Seamount Chain - microcontinents or the trail of the Tristan-Gough hotspot? Cruise No. MSM 82, 18 March 2019 - 24 April 2019, Montevideo (Uruguay) - Montevideo (Uruguay), RIOGRANDE.

Geissler, Wolfram, Krumm, Stefan, O'Connor, John, Geldmacher, Jörg , Altenbernd, Tabea, Homrighausen, Stephan, Geils, Jonah, Hoyer, Patrick, Lehmann, Carsten and Shearing, Jennifer (2019) The Rio Grande Rise and Jean Charcot Seamount Chain - microcontinents or the trail of the Tristan-Gough hotspot? Cruise No. MSM 82, 18 March 2019 - 24 April 2019, Montevideo (Uruguay) - Montevideo (Uruguay), RIOGRANDE. Open Access . MARIA S. MERIAN-Berichte, MSM82 . Gutachterpanel Forschungsschiffe, Bonn, 200 pp. DOI 10.2312/cr_msm82.

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Abstract

Rio Grande Rise: microcontinent, mantle plume, or both? The origin of the Rio Grande Rise (RGR) is debated. It could represent a continental sliver, or a large igneous province that was emplaced in the late Cretaceous after the opening of the South Atlantic Ocean. The interplay between the RGR and the nearby Jean Charcot Seamount Chain (JCSC) is also not understood. Cruise MSM82 dredge sampled rocks from the JCSC and the RGR and measured two seismic refraction profiles across the RGR where it is bisected by a long rift graben. A range of geophysical data were also collected during much of the expedition, including magnetics, gravity, bathymetry (Kongsberg EM 122), sub-bottom profiling (ATLAS PARASOUND DS P70) and ADCP data. The combination of geochronological, geochemical and geophysical information will provide a unique window on the relation between mantle plumes, continental fragments and the evolution of large igneous provinces.

Document Type: Report (Cruise Report)
Keywords: RV Maria S. Merian, MSM82, cruise report, Rio Grande rise, Jean Charcot Seamount
Research affiliation: HGF-AWI
OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS
Publisher: Gutachterpanel Forschungsschiffe
Projects: RIOGRANDE
Expeditions/Models/Experiments:
Date Deposited: 06 Jan 2020 13:01
Last Modified: 07 Jul 2023 12:01
URI: https://oceanrep.geomar.de/id/eprint/48596

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