FN Archimer Export Format
PT J
TI Young Marquesas volcanism finally located
BT 
AF REVILLON, Sidonie
   GUILLOU, Herve
   MAURY, Rene C.
   CHAUVEL, Catherine
   ASLANIAN, Daniel
   PELLETER, Ewan
   SCAO, Vincent
   LOUBRIEU, Benoit
   PATRIAT, Martin
AS 1:1,3;2:2;3:3;4:4;5:5;6:5;7:2;8:5;9:5;
FF 1:;2:;3:;4:;5:PDG-REM-GM-LGS;6:PDG-REM-GM-LCG;7:;8:PDG-REM-GM-CTDI;9:PDG-REM-GM-LAD;
C1 IUEM, SEDISOR, Pl Nicolas Copernic, F-29280 Plouzane, France.
   UVSQ, CNRS, CEA, UMR LSCE 8212, F-91118 Gif Sur Yvette, France.
   Univ Bretagne Occidentale, IUEM, Lab Geosci Ocean, UMR 6538, F-29280 Plouzane, France.
   Univ Grenoble Alpes, CNRS, ISTerre, F-38000 Grenoble, France.
   Ifremer CB, Unite Rech Geosci Marines, F-29280 Plouzane, France.
C2 UBO, FRANCE
   UNIV VERSAILLES, FRANCE
   UBO, FRANCE
   UNIV GRENOBLE ALPES, FRANCE
   IFREMER, FRANCE
SI BREST
SE PDG-REM-GM-LGS
   PDG-REM-GM-LCG
   PDG-REM-GM-CTDI
   PDG-REM-GM-LAD
UM LGO
IN WOS Ifremer jusqu'en 2018
   copubli-france
   copubli-univ-france
IF 3.857
TC 4
UR https://archimer.ifremer.fr/doc/00407/51832/52431.pdf
LA English
DT Article
CR POLYPLAC
BO L'Atalante
DE ;Submarine volcanism;Ar-40-Ar-39 ages;Geochemistry;Plume;Marquesas;French Polynesia
AB The Marquesas Island chain in Polynesia is quite unusual because the alignment of the islands on the Pacific oceanic plate (N40°W) does not follow the plate motion in the region (N65°W). The exact location of the active hotspot is unknown but has been predicted to underlie the Marquesas Fracture Zone Ridge. Nevertheless, no concrete evidence exists. Here, we document the occurrence on this ridge of fresh tephrites dated at ~ 92 ka by the 40Ar-39Ar method. The lavas dredged on a small seamount have trace element contents and Sr, Nd, Pb isotopic compositions typical of the southwest Marquesas Islands, the Fatu Hiva group. This discovery demonstrates that the Marquesas plume is still active and it puts new constraints on its present location. It also supports McNutt et al.’s (1989) interpretation of the Marquesas Fracture Zone Ridge as a very young volcanic construction underlain by a hotspot. We suggest that the present location of the Marquesas plume is under the ridge, at its intersection with the isotopic divide known along the Marquesas chain. We attribute the presence of young volcanic products 190 km southwest of this location to preferential magma flow along the Marquesas Fracture lithospheric weakness zone. We also suggest that the puzzling general direction of the archipelago is the consequence of a persistent low magma flux over the past 5 Ma that could only find its way to the surface through multiple weak zones in the Pacific plate. 
PY 2017
PD DEC
SO Lithos
SN 0024-4937
PU Elsevier Science Bv
VL 294-295
UT 000418970800021
BP 356
EP 361
DI 10.1016/j.lithos.2017.10.013
ID 51832
ER

EF