Plattform Platform	Reise-Nr. Cruise-No.	Zeitraum Period	Projekt Project	Arbeitsgebiet Working area
Sonne	SO271-1	31.10.2019 - 18.12.2019	INDEX	Indian Ocean

Fahrtleiter Chief Scientist	Institut Institute	Auslaufhafen Port of departure	Einlaufhafen Port of return	Stationskarte Station map	Schiffsroute Trackchart
Schwarz-Schampera Ulrich	Bundesanstalt fur Geowissenschaften und Rohstoffe, Hannover	Port Louis	Port Louis

Ziel der Reise / Objectives of Cruise:

Cruise SO271/1 (INDEX 2019/1) targeted the German license area for polymetallic sulfides in the Indian Ocean. Ship and technical operations were generally unproblematic. A total of 131 stations with survey, observation and sampling operations were completed in the license clusters #01, #04, #05, #06, #07, #10, and #12 and twelve different operational tools were used for multidisciplinary diverse and detailed exploration and environmental studies in transit and within the license area, including six vertical CTD rosette casts for environmental, water masses and sedimentary studies, three multicorer and seven gravity corer stations for paleooceanographic and biogeochemical studies, five sediment trap plus current meter and one ADCP mooring recoveries and redeployments for biogeochemistry, particle flux and ocean current measurements, eight heat flow measurements for the evaluation of crustal temperature distribution, 24 wax corer and 15 dredge stations for petrological studies of the ridge and Rodrigues triple junction evolution, ten sediment trap and current meter moorings and two ADCP moorings for biogeochemical studies and particle flux and current measurements, a total of 20 deep-towed HOMESIDE surveys for high-resolution bathymetric mapping, magnetics and water anomaly and self-potential surveys (total of 330 km, 202 km? in 153 hours), 11 tow-yo stations with the SOPHI sensor sled for plume hunting (183 km, 116 hours), 17 ROPOS dives for reconnaissance survey, mapping and sampling of active and inactive vent sites and sulfide fields (total of 112 hours bottom time), and 938 hours of bathymetric mapping (total 4541 km) with EM122 and 994 hours (4,828 km) of measurements in the water column with the echo sounder EK60. The biodiversity was studied in 4125 samples with a total of 5,477 individuals. 89 samples were obtained for microbiological studies. Additionally, 27 hydrothermal vent fluids were sampled during the ROPOS dives and shipboard characterized. Swath bathymetric mapping and scientific echosounder measurements for water column imaging were carried out during the entire cruise outside the EEZ of Mauritius.

Messungen / Measurements

Verankerungen / Moorings