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Arago Seamount: The missing hotspot found in the Austral Islands

2002; Geological Society of America; Volume: 30; Issue: 11 Linguagem: Inglês

10.1130/0091-7613(2002)030 2.0.co;2

1943-2682

Alain Bonneville, R. Le Suavé, Laurence Audin, Valérie Clouard, Laure Dosso, Pierre Gillot, P. E. Janney, Kelsey Jordahl, Keitapu Maamaatuaiahutapu,

Geology and Paleoclimatology Research

Research Article| November 01, 2002 Arago Seamount: The missing hotspot found in the Austral Islands Alain Bonneville; Alain Bonneville 1Centre National de la Recherche Scientifique, Géosciences Marines, Institut de Physique du Globe, 4 place Jussieu, Paris, France Search for other works by this author on: GSW Google Scholar Raymond Le Suavé; Raymond Le Suavé 2Centre National de la Recherche Scientifique, Département de Géosciences Marines, Institut Français de Recherche pour l'Exploitation de la Mer, BP 70, 29280 Plouzané, France Search for other works by this author on: GSW Google Scholar Laurence Audin; Laurence Audin 3Université Paul Sabatier, Institut de Recherche pour le Développement, 38, rue des 36 Ponts, 31000, Toulouse, France Search for other works by this author on: GSW Google Scholar Valérie Clouard; Valérie Clouard 4Université de la Polynésie Française, BP 6570, Faaa, Tahiti, French Polynesia Search for other works by this author on: GSW Google Scholar Laure Dosso; Laure Dosso 5Centre National de la Recherche Scientifique, Département de Géosciences Marines, Institut Français de Recherche pour l'Exploitation de la Mer, BP 70, 29280 Plouzané, France Search for other works by this author on: GSW Google Scholar Pierre Yves Gillot; Pierre Yves Gillot 6Laboratoire Géochronologie, Sciences de la Terre, Université Paris-Sud, 91405 Orsay, France Search for other works by this author on: GSW Google Scholar Philip Janney; Philip Janney 7Department of Geology, Field Museum of Natural History, Chicago, Illinois 60605, USA Search for other works by this author on: GSW Google Scholar Kelsey Jordahl; Kelsey Jordahl 8Monterey Bay Aquarium Research Institute, Moss Landing, California 95039, USA Search for other works by this author on: GSW Google Scholar Keitapu Maamaatuaiahutapu Keitapu Maamaatuaiahutapu 9Université de la Polynésie Française, BP 6570, Faaa, Tahiti, French Polynesia Search for other works by this author on: GSW Google Scholar Author and Article Information Alain Bonneville 1Centre National de la Recherche Scientifique, Géosciences Marines, Institut de Physique du Globe, 4 place Jussieu, Paris, France Raymond Le Suavé 2Centre National de la Recherche Scientifique, Département de Géosciences Marines, Institut Français de Recherche pour l'Exploitation de la Mer, BP 70, 29280 Plouzané, France Laurence Audin 3Université Paul Sabatier, Institut de Recherche pour le Développement, 38, rue des 36 Ponts, 31000, Toulouse, France Valérie Clouard 4Université de la Polynésie Française, BP 6570, Faaa, Tahiti, French Polynesia Laure Dosso 5Centre National de la Recherche Scientifique, Département de Géosciences Marines, Institut Français de Recherche pour l'Exploitation de la Mer, BP 70, 29280 Plouzané, France Pierre Yves Gillot 6Laboratoire Géochronologie, Sciences de la Terre, Université Paris-Sud, 91405 Orsay, France Philip Janney 7Department of Geology, Field Museum of Natural History, Chicago, Illinois 60605, USA Kelsey Jordahl 8Monterey Bay Aquarium Research Institute, Moss Landing, California 95039, USA Keitapu Maamaatuaiahutapu 9Université de la Polynésie Française, BP 6570, Faaa, Tahiti, French Polynesia Publisher: Geological Society of America Received: 23 Apr 2002 Revision Received: 19 Jul 2002 Accepted: 26 Jul 2002 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2002) 30 (11): 1023–1026. https://doi.org/10.1130/0091-7613(2002)030 2.0.CO;2 Article history Received: 23 Apr 2002 Revision Received: 19 Jul 2002 Accepted: 26 Jul 2002 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Alain Bonneville, Raymond Le Suavé, Laurence Audin, Valérie Clouard, Laure Dosso, Pierre Yves Gillot, Philip Janney, Kelsey Jordahl, Keitapu Maamaatuaiahutapu; Arago Seamount: The missing hotspot found in the Austral Islands. Geology 2002;; 30 (11): 1023–1026. doi: https://doi.org/10.1130/0091-7613(2002)030 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 The Austral archipelago, on the western side of the South Pacific superswell, is composed of several volcanic chains, corresponding to distinct events from 35 Ma to the present, and lies on oceanic crust created between 60 and 85 Ma. In 1982, Turner and Jarrard proposed that the two distinct volcanic stages found on Rurutu Island and dated as 12 Ma and 1 Ma could be due to two different hotspots, but no evidence of any recent aerial or submarine volcanic source has ever been found. In July 1999, expedition ZEPOLYF2 aboard the R/V L'Atalante conducted a geophysical survey of the northern part of the Austral volcanic archipelago. Thirty seamounts were mapped for the first time, including a very shallow one (<27 m below sea level), located at lat 23°26.4′S, long 150°43.8′W, ∼120 km southeast of Rurutu. A nepheline-rich scoriaceous basalt sample from pillow lavas dredged on the newly mapped seamount's western flank gave a K-Ar age of 230 ± 0.004 ka obtained on pure selected nepheline. We propose that this seamount, already called Arago Seamount after a French Navy ship that discovered its summit in 1993, is the missing hotspot in the Cook-Austral history. This interpretation adds a new hotspot to the already complicated geologic history of this region. We suggest that several hotspots have been active simultaneously on a region of the seafloor that does not exceed 2000 km in diameter and that each of them had a short lifetime (<20 m.y.). These short-lived and closely spaced hotspots cannot be the result of discrete deep-mantle plumes and are likely due to more local upwelling in the upper mantle strongly influenced by weaknesses in the lithosphere. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.