FN Archimer Export Format PT J TI Widespread volcanism Southeast of Futuna Island (SW Pacific Ocean): Near-seafloor magnetic dating and regional consequences BT AF Szitkar, Florent Dyment, Jérôme Fouquet, Yves AS 1:1;2:2;3:3; FF 1:;2:;3:PDG-REM-GM-LCG; C1 NGU, The Geological Survey of Norway, Trondheim, Norway Institut de Physique du Globe de Paris, CNRS, Paris, France Ifremer, GM, F-29280 Plouzané, France C2 GEOL SURVEY NORWAY, NORWAY IPGP, FRANCE IFREMER, FRANCE SI BREST SE PDG-REM-GM-LCG IN WOS Ifremer UPR copubli-france copubli-europe IF 2.789 TC 3 UR https://archimer.ifremer.fr/doc/00651/76273/77225.pdf https://archimer.ifremer.fr/doc/00651/76273/77226.docx https://archimer.ifremer.fr/doc/00651/76273/77227.jpg https://archimer.ifremer.fr/doc/00651/76273/77228.jpg https://archimer.ifremer.fr/doc/00651/76273/77229.jpg https://archimer.ifremer.fr/doc/00651/76273/77230.jpg https://archimer.ifremer.fr/doc/00651/76273/77231.jpg https://archimer.ifremer.fr/doc/00651/76273/77232.jpg https://archimer.ifremer.fr/doc/00651/76273/77233.jpg LA English DT Article CR ALAUFI FUTUNA FUTUNA 2 LEG1 FUTUNA 2 LEG2 FUTUNA 3 BO L'Atalante AB Near-seafloor bathymetric and magnetic data have been collected by Autonomous Underwater Vehicle (AUV) and manned submersible (DSS) over a volcanically active area southeast of Futuna Island, French Territory of Wallis-and-Futuna, in the Southwestern Pacific Ocean. Located at the edge of the Lau and North Fiji basins, at the convergence of the Pacific and Australian plates, this area is characterized by intense volcanic and tectonic activity. Direct observation by submersible reveals that the seafloor is covered by recent lava flows, volcanoes and large, active or inactive calderas filled by smooth lava flows and eventually hosting hydrothermal sites. We investigate the volcanic chronology by combining a Bayesian inversion of the AUV-gridded magnetic data with an inversion of the submersible data specifically designed to estimate the rock magnetic polarity and absolute magnetization. We show that some volcanoes predate the last (Brunhes-Matuyama) magnetic polarity reversal 780 kyr ago whereas their neighbors exhibit a normal polarity and appear to be recent. This result suggests that the seafloor in this region has undergone continuous and sparse volcanic activity over the last few million years. PY 2020 PD NOV SO Journal Of Volcanology And Geothermal Research SN 0377-0273 PU Elsevier BV VL 406 UT 000592399900003 DI 10.1016/j.jvolgeores.2020.107064 ID 76273 ER EF