GEOCYATHERM LEG 1

Name: GEOCYATHERM LEG 1
Start: 1982-01-07
End: 1982-01-24
Location: Northeast Pacific Ocean (180W)

Type	Oceanographic cruise
Ship	Le Suroît
Ship owner	Ifremer
Dates	07/01/1982 - 24/01/1982
Chief scientist(s)	HEKINIAN Roger
	GEO-OCEAN - UMR 6538 Univ. Brest, CNRS, Ifremer, Univ. Bretagne Sud Place Nicolas Copernic 29280 Plouzané https://www.geo-ocean.fr/
DOI	10.17600/82001711
Objective	The GEOCYATHERM cruise is part of the CNEXO programme to study ocean hydrothermalism. Its main objectives were: to discover active hydrothermal sites, to study them in situ (physical, chemical, geological studies) and to estimate the importance of sulphide fields in a specific area and to explore the ridge (from the surface and in submersible) to discover hydrothermal and volcanic (Seamount) sites outside the accretionary axes.

Sea/Ocean

Northeast Pacific Ocean (180W)

(PACIFIQUE NORD EST)

Ports

Port of departure : Acapulco (Mexico)

Port of return : Manzanillo (Mexico)

Scientific Authority

GÉOSCIENCES MARINES

Centre Ifremer Bretagne

ZI Pointe du Diable

29280 Plouzané

+33(0)2 98.22.42.24

Participating bodie(s)

IFREMER CENTRE DE BREST

Discipline(s)

SUBMERSIBLE
PHYSICAL OCEANOGRAPHY
MARINE GEOSCIENCES

Code	Label	Quantity	PI
D01	Current meters	2 deployments	HEKINIAN Roger
G02	Grab	3 samples	HEKINIAN Roger
G08	Bottom photography 350 metres (27 bobines)	-	HEKINIAN Roger
G28	Magnetic measurements	-	HEKINIAN Roger
G74	Multi-beam echosounding	-	HEKINIAN Roger
G90	Other geosciences meas. 20 prelvmts a partir engins s/marins + 2 prelvmts a partir du RAIE	22 samples	HEKINIAN Roger
H27	Alkalinity	4 stations	BOULEGUE Jacques
H28	pH	4 stations	BOULEGUE Jacques
H71	Surface measurements underway (T,S)	4	BOULEGUE Jacques
H72	Thermistor chain	1 deployments	HEKINIAN Roger
H90	Other chemical oceanographic meas. Chlorinite et manganese	4 stations	BOULEGUE Jacques

Summary of measurements

-Deployment of acoustic beacon fields on 4 zones.
-Recovery of a sediment trap.
-Mooring of 5 sediment traps (+ current meter).
-14 hydrology stations (+ current meter).
-4 ray stations.
-14 stations Shipeck grab.
-3 short corer stations.
-Mooring and recovery of a thermistor chain.
-32 CYANA dives (6 of which with fluid sampling).

Location map

Positionning system

Geodetic system : WORLD GEODETIC SYSTEM 1972 = WGS72

Positioning system : CYANA : acoustique

Sampling operations

Name	Dive	Equipement	Date	Location	Depth(m)
CY-82-01	501-1	Panier	19820112 00:00:0012/01/1982 00:00:00	12° 48.500' N 103° 56.500' W	-
CY-82-02	502-2	Panier	19820113 00:00:0013/01/1982 00:00:00	12° 47.000' N 103° 56.000' W	-
CY-82-03	503-3	Panier	19820114 00:00:0014/01/1982 00:00:00	12° 50.000' N 103° 57.000' W	-
CY-82-04	504-4	Panier	19820115 00:00:0015/01/1982 00:00:00	12° 46.500' N 103° 56.000' W	-
CY-82-05	505-5	Panier	19820116 00:00:0016/01/1982 00:00:00	12° 46.000' N 103° 56.000' W	-
CY-82-06	506-6	Panier	19820117 00:00:0017/01/1982 00:00:00	12° 52.300' N 103° 57.000' W	-
CY-82-09	509-9	Panier	19820121 00:00:0021/01/1982 00:00:00	12° 43.000' N 103° 55.500' W	-
CY-82-10	510-10	Panier	19820122 00:00:0022/01/1982 00:00:00	12° 49.300' N 103° 57.000' W	-
CY-82-11	511-11	Panier	19820123 00:00:0023/01/1982 00:00:00	11° 30.000' N 103° 57.000' W	-
GCY-RAIE01	-	Camera	19820117 03:35:0017/01/1982 03:35:00	12° 44.360' N 103° 57.300' W	-
GCY-RAIE02	-	Camera	19820122 00:00:0022/01/1982 00:00:00	12° 51.420' N 103° 57.060' W	-
GCY-SH-01	-	Benne SHIPECK	19820120 04:30:0020/01/1982 04:30:00	11° 26.990' N 103° 48.370' W	2700

Bibliography

Publications

Jean-Baptiste P, Fouquet Yves (1996). Abundance and isotopic composition of helium in hydrothermal sulfides from the East Pacific Rise at 13 degrees N. Geochimica Et Cosmochimica Acta, 60(1), 87-93. https://doi.org/10.1016/0016-7037(95)00357-6

Crane Kathleen, Aikman Frank, Foucher Jean-Paul (1988). The distribution of geothermal fields along the East Pacific Rise from 13°10′ N to 8°20′ N: Implications for deep seated origins. Marine Geophysical Researches, 9(3), 211-236. https://doi.org/10.1007/BF00309974

References of Articles published in other Periodicals or Scientific Works acclaimed in the Field

Vaslet Nathalie, Fouquet Yves, Voisset Michel, Bougault Henri (1989). Apports des images du sonar latéral SAR à la cartographie d'une zone hydrothermale de la ride Est Pacifique. Comptes Rendus De L Academie Des Sciences Serie Ii, 309(2), 267-273.

Bideau Daniel, Fouquet Yves, Hekinian Roger (1985). Découverte de basaltes métamorphisés dans le graben axial de la dorsale Est-Pacifique à 12°50' N. Bulletin De La Societe Geologique De France, 1(6), 905-913.

References of Technical Reports

Dyment Jérôme, Lallier François, Le Bris Nadine, Rouxel Olivier , Sarradin Pierre-Marie , Lamare Sylvain, Coumert Coralie, Morineaux Marie, Tourolle Julie (2014). Les impacts environnementaux de l’exploitation des ressources minérales marines profondes. Expertise scientifique collective. Rapport, CNRS – Ifremer, 937 p. https://archimer.ifremer.fr/doc/00872/98434/

CNEXO, COB, Brest (1982). Compte-rendu de campagne : CYATHERM.

Related number	Absolute number	Vehicle	Date	Location
1	501	Cyana	19820112 16:24:0012/01/1982 16:24:00	0° 0.000' N 0° 0.000' E
2	502	Cyana	19820113 21:00:0013/01/1982 21:00:00	0° 0.000' N 0° 0.000' E
3	503	Cyana	19820114 16:00:0014/01/1982 16:00:00	0° 0.000' N 0° 0.000' E
4	504	Cyana	19820115 18:44:0015/01/1982 18:44:00	0° 0.000' N 0° 0.000' E
5	505	Cyana	19820116 20:52:0016/01/1982 20:52:00	0° 0.000' N 0° 0.000' E
6	506	Cyana	19820117 16:15:0017/01/1982 16:15:00	0° 0.000' N 0° 0.000' E
7	507	Cyana	19820119 17:22:0019/01/1982 17:22:00	0° 0.000' N 0° 0.000' E
8	508	Cyana	19820120 18:17:0020/01/1982 18:17:00	0° 0.000' N 0° 0.000' E
9	509	Cyana	19820121 16:28:0021/01/1982 16:28:00	0° 0.000' N 0° 0.000' E
10	510	Cyana	19820122 17:24:0022/01/1982 17:24:00	0° 0.000' N 0° 0.000' E
11	511	Cyana	19820123 16:33:0023/01/1982 16:33:00	0° 0.000' N 0° 0.000' E

French Oceanographic Cruises

GEOCYATHERM LEG 1

Sampling operations

Dives

Bibliography