Jul 13, 2017 - pH. Eh"(mV). pH"for"H2S. H2S"mg/l Total"S"mg/l H2S"mmol/l. Salinity"â°. Conductivity"mS/cm. TDS"g/l. M17DEAFSFLU06. 7,75. $50. 7,48. 2,34.
DEAFS test at the bottom seafloor: nearby Montsegur (EMSO-‐Azores; Lucky Strike Hydrothermal field) 1. On-‐board of the Pourquoi Pas? Research Vessel.
DEAFS getting ready for deployment. DEAFS instrument has been jointly designed and fabricated by Geosciences Environnement Toulouse GET (CNRS UMR5563) and TOP Industrie S.A.S. (http://www.top-‐industrie.com). The intellectual properties have been facilitated by Toulouse Tech Transfer (www.toulouse-‐tech-‐transfer.com). Credit: V. Chavagnac, CNRS.
2. DEAFS set-‐up in NASA, prior to deployment at the bottom seafloor
Alain Castillo (Assistant Engineer CNRS-‐GET) and Valérie Chavagnac (Researcher CNRS-‐GET) are in charge of high-‐temperature hydrothermal fluid sampling at the EMSO-‐Azores deep-‐sea observatory. Their tools -‐ 4 gas-‐tight titanium syringes and DEAFS -‐ are set-‐up in NASA, ready for deployment. Credit: C. Destrigneville (University of Toulouse -‐ GET)
3. DEAFS at the seafloor.
DEAFS has been set-‐up at the bottom seafloor for test. The instrument was scheduled to perform fluid sampling every hour on the 13-‐14th of July Credit: ROV Victor 6000, CNRS/IFREMER, cruise MoMARSAT’2017.
A"#"Deployment"site 4. Deployment information date 13/07/2017 14/07/2017
time 23:00:00 00:00:00 01:00:00 02:00:00 03:00:00
site latitude"(N) longitude"(W) depth"mbsl DEAFS-2017-test 37°17.2744 32°16.5461 1700 nearby-Montserrat
T°C 4
sample"Name M17DEAFSFLU06 M17DEAFSFLU07 M17DEAFSFLU08 M17DEAFSFLU09 M17DEAFSFLU10
B"#"On#board"chemical"analyses 5. On-‐board chemical analyses sample"Name M17DEAFSFLU06 M17DEAFSFLU07 M17DEAFSFLU08 M17DEAFSFLU09 M17DEAFSFLU10
pH 7,75 7,66 7,63 7,72 7,83
Eh"(mV) $50 $24 $6 $11 $50
pH"for"H2S 7,48 7,72 7,65 7,64 7,65
H2S"mg/l 2,34 2,15 2,5 2,91 2,65
Total"S"mg/l H2S"mmol/l 13,2 0,067 22,7 0,061 18,5 0,071 17,6 0,083 19,3 0,076
Salinity"‰ 32,2 32,2 32,3 32,2 32,3
Conductivity"mS/cm 50,6 50,6 50,6 50,6 50,6
TDS"g/l 29,6 29,6 29,7 29,6 29,6
C"#"On#shore"chemical"analyses 6. On-‐shore chemical analyses
sample"Name Ca"mmol/l K"mmol/l Mg"mmol/l Sr"µmol/l Li"µmol/l Si"µmol/l M17DEAFSFLU06 10,604 10,308 49,011 68,43 51,9 48,6 M17DEAFSFLU07 10,928 10,588 49,186 75,43 50,6 31,9 M17DEAFSFLU08 10,856 10,587 49,054 81,31 52,7 28,1 M17DEAFSFLU09 10,848 10,492 49,723 86,18 51,7 27,9 M17DEAFSFLU10 10,839 10,495 49,547 79,71 52,9 26,7 limit"of"detection"(µmol/l) 0,1 1,5 0,6 0,02 0,2 0,1 limit"of"quantification"(µmol/l) 0,3 5 1,9 0,06 0,7 0,4 Element concentrations are different from those of seawater as the DEAFS sampled fluid at the bottom seafloor in close vicinity of hydrothermal vents (
