FN Archimer Export Format PT J TI Helium isotopic composition of hydrothermal fluids from the Manus back-arc Basin, Papua New Guinea BT AF FOURRE, E JEAN BAPTISTE, P CHARLOU, Jean-Luc DONVAL, Jean-Pierre ISHIBASHI, J AS 1:1;2:1;3:2;4:2;5:3; FF 1:;2:;3:PDG-DOP-DCB-GM-LGM;4:PDG-DOP-DCB-GM-LGM;5:; C1 CEA Saclay, CEA, CNRS, UMR 1572,IPSL LSCE, F-91191 Gif Sur Yvette, France. IFREMER, DRO GM, Ctr Brest, F-29280 Plouzane, France. Kyushu Univ, Dept Earth & Planetary Sci, Fukuoka 8128581, Japan. C2 CEA, FRANCE IFREMER, FRANCE UNIV KYUSHU, JAPAN SI BREST SE PDG-DOP-DCB-GM-LGM IN WOS Ifremer jusqu'en 2018 copubli-france copubli-int-hors-europe IF 1.01 TC 16 TU Centre national de la recherche scientifique Commissariat à l'énergie atomique et aux énergies alternatives Université de Versailles Saint-Quentin-en-Yvelines UR https://archimer.ifremer.fr/doc/2006/publication-4203.pdf LA English DT Article CR MANAUTE BO L'Atalante DE ;Western Pacific;Manus Basin;Back arc basins;Hydrothermal fluids;Helium isotopes AB We present isotopic analysis of helium in hydrothermal fluids from the Manus back-arc basin, collected during the French-Japanese Manusflux and Manaute cruises in 1995 and 2000, respectively. The helium isotope composition of the fluids is comparable to that measured elsewhere in similar subduction environments, with He-3/He-4 values (7.4 to 7.9 R-a) slightly lower than typical MORB values, except on the Manus Spreading Center (MSC) where higher values (12 +/- 0.1 R-a) are observed. The causal link between the narrow spatial extent of the He-3/He-4 anomaly at the MSC and a He-3-rich deep mantle component remains elusive, based on available geophysical data. Thus, the Manus Spreading Center results may be an interesting example of small scale upper-mantle heterogeneity. PY 2006 PD JUL SO Geochemical Journal SN 0016-7002 PU Terrapub VL 40 IS 3 UT 000239439100003 BP 245 EP 252 DI 10.2343/geochemj.40.245 ID 4203 ER EF