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International Ocean Discovery Program Expedition 391 Scientific Prospectus Addendum

Walvis Ridge Hotspot: drilling Walvis Ridge, Southeast Atlantic Ocean, to test models of ridge-hotspot interaction, isotopic zonation, and the hotspot reference frame1

William Sager

Co-Chief Scientist

Department of Earth and Atmospheric Sciences

University of Houston


Kaj Hoernle

Co-Chief Scientist

Research Division 4: Dynamics of the Ocean Floor

GEOMAR Helmholtz Centre for Ocean Research Kiel


Katerina Petronotis

Expedition Project Manager/Staff Scientist

International Ocean Discovery Program

Texas A&M University


Published February 2021

See the full publication in PDF.


This addendum to the International Ocean Discovery Program Expedition 391 Scientific Prospectus (Walvis Ridge Hotspot; Sager et al., 2020) incorporates minor coordinate changes to Proposed Sites CT-5A, CT-6A, TT-3A, TT-4A, TT-5A, VB-7A, VB-8A, VB-10A, VB-11A, VB-13A, and VB-14A. The revised site coordinates are documented in Proposal 890-Add2, which is available at​scienceops/​expeditions/​walvis_ridge_hotspot.html.

In addition, because of adjustments to the R/V JOIDES Resolution operations schedule caused by the COVID-19 pandemic, the expedition was postponed by a year. At the time of publication of this addendum, the expedition is scheduled to start in Cape Town, South Africa, on 6 December 2021 and end in Cape Town, South Africa, on 5 February 2022.

For a detailed description of the geologic background, scientific objectives, drilling and coring strategy, logging strategy, sample and data sharing strategy, and proposed sites, see Tables T1 and T2 in this report and the Expedition 391 Scientific Prospectus (Sager et al., 2020).

1 Sager, W., Hoernle, K., and Petronotis, K., 2021. Expedition 391 Scientific Prospectus Addendum: Walvis Ridge Hotspot. International Ocean Discovery Program.

This work is distributed under the Creative Commons Attribution 4.0 International (CC BY 4.0) license.