FN Archimer Export Format
PT J
TI Significant Impact of Hydrothermalism on the Biogeochemical Signature of Sinking and Sedimented Particles in the Lau Basin
BT 
AF Tilliette, Chloé
   Gazeau, Frédéric
   Chavagnac, Valérie
   Leblond, Nathalie
   Montanes, Maryline
   Leblanc, Karine
   Schmidt, Sabine
   Charrière, Bruno
   Bhairy, Nagib
   Guieu, Cécile
AS 1:1;2:1;3:2;4:1;5:1;6:3;7:4;8:5;9:3;10:1;
FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;
C1 Laboratoire d’Océanographie de Villefranche Sorbonne Université CNRS Villefranche‐sur‐Mer, France
   Géosciences Environnement Toulouse CNRS Université de Toulouse IRD Toulouse, France
   Aix Marseille University Université de Toulon CNRS IRD Marseille, France
   University Bordeaux CNRS Bordeaux INP EPOC Pessac, France
   Centre de Formation et de Recherche sur l'Environnement Méditerranéen (CEFREM, UMR CNRS 5110) Bât. U, Université de Perpignan Via Domitia (UPVD) Perpignan ,France
C2 UNIV SORBONNE, FRANCE
   UNIV TOULOUSE, FRANCE
   UNIV AIX MARSEILLE, FRANCE
   UNIV BORDEAUX, FRANCE
   UNIV PERPIGNAN, FRANCE
SI TOULON
SE CNRS
IF 3.6
TC 0
UR https://archimer.ifremer.fr/doc/00864/97574/106451.pdf
   https://archimer.ifremer.fr/doc/00864/97574/106452.pdf
LA English
DT Article
CR TONGA 2019
   TONGA RECUP
BO L'Atalante
   Alis
DE ;hydrothermal impacts;biological production;composition of sinking and sedimented material;trace metals;Tonga volcanic arc;western tropical south Pacific ocean
AB Iron (Fe) is an essential micronutrient for diazotrophs, which are abundant in the Western Tropical South Pacific Ocean (WTSP). Their success depends on the numerous trace metals, particularly Fe, released from shallow hydrothermal vents along the Tonga Arc. This study aimed to explore the spatio‐temporal impact of hydrothermal fluids on particulate trace metal concentrations and biological activity. To identify the composition of sinking particles across a wide area of the WTSP, we deployed sediment traps at various depths, both close and further west of the Tonga Arc. Seafloor sediments were cored at these deployment sites, including at a remote location in the South Pacific Gyre. The sinking particles were composed of a large amount of biological material (up to 88 mg d−1), indicative of the high productivity of the region. A significant portion of this material (∼21 ± 12 wt.%) was lithogenic of hydrothermal origin, as revealed through Al‐Fe‐Mn tracing. The sinking material showed similar patterns between lithogenic and biogenic fractions, indicating that hydrothermal input within the photic layer triggered surface production. A hydrothermal fingerprint was suggested in the sediments due to the high sedimentation rates (>47 cm kyr−1) and the presence of large, heterogeneous, metal‐rich particles. The presence of nearby active deep hydrothermal sources was suspected near the Lau Ridge due to the large particle size (1–976 μm) and the significant excess of Fe and Mn (2–20 wt.%). Overall, this study revealed that hydrothermal sources have a significant influence on the biogeochemical signature of particles in the region. 
PY 2023
PD DEC
SO Journal Of Geophysical Research-oceans
SN 2169-9275
PU American Geophysical Union (AGU)
VL 128
IS 12
UT 001111237900001
DI 10.1029/2023JC019828
ID 97574
ER

EF