RRS James Cook JC142 (MarineE-tech)

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS James Cook (740H)
Cruise identifierJC142 (MarineE-tech)
Cruise period2016-10-29 — 2016-12-08
Port of departureSanta Cruz de Tenerife, Spain
Port of returnSanta Cruz de Tenerife, Spain
ObjectivesCruise JC142 departed Santa Cruz, Tenerife of the 29th of October 2016 on the RRS James Cook. The aims and objectives of Cruise JC142 were to undertake a holistic study of a simple seamount in the NE Atlantic with the focus on those processes that control the formation, composition and distribution of ferromanganese crusts. These crusts are rich in scares elements including cobalt and tellurium that are considered critical to emerging technologies and especially those that needed for low-carbon energy production. Cruise JC142 was in support of the NERC research programme 'SoS Minerals', of which MarineE-tech formed one of four large consortium projects.
Chief scientistBramley J Murton (National Oceanography Centre, Southampton)
Cruise reportRRS James Cook JC142 (MarineE-tech) cruise report jc142.pdf (85.74 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
SpecificTropic Seamount, Western Sahara Seamount Province
Track chartsRRS James Cook JC142 (MarineE-tech) cruise track — jc142trk.pdf (0.98 MB) 
Physical oceanography 
Surface measurements underway (T,S)Quantity: activity duration in days = 40
Description: The Surfmet system was run throughout the cruise.
Water bottle stationsQuantity: 100
Description: Water bottle (Niskin) samples for salinity, nutrient and microbial analyses
Current profiler (eg ADCP)Quantity: activity duration in days = 40
Description: Both the 75 kHz and 150 kHz ADCP systems were run throughout the cruise as requested. The 75 kHz was run in broadband mode with 48 bins of 16 m with an 8 m blank. The 150 kHz was run in narrowband mode with 96 bins of 4 m with an 4 m blank. Bottom tracking was enabled on the run into port to allow the orientation of the transducers to be calibrated. These were found to be offset from the orientation last recorded, and the data required re-calibration.
Other physical oceanographic measurementsQuantity: activity duration in days = 46
Description: The Sonardyne USBL system was used to track every deployment of the AUV and ROV.
Biology and fisheries 
Other biological/fisheries measurementQuantity: number of stations = 59
Description: Various fauna collected from 59 ROV stations for later identification and genetic studies
Geology and geophysics 
Core - soft bottomQuantity: number of cores = 24
Description: Sediment cores, including ROV push cores and gravity cores for grain size analyses and geochemistry.
In-situ seafloor measurement/samplingQuantity: number of samples = 350
Description: Grab and drilled samples of cobalt-rich crusts, phosphorite and volcanic rocks taken by ROV from in situ locations on the sea floor. For later geochemical and isotopic analyses
Single-beam echosoundingQuantity: activity duration in days = 40
Description: The EA600 single-beam echo-sounder was run throughout the cruise while in international waters. All depths were logged to the Techsas and Level-C data loggers and raw files in raw Kongsberg .all format
Multi-beam echosoundingQuantity: activity duration in days = 40
Description: Swath sonar mapping and sub-bottom profiling: The EM120 multi-beam echo sounder was run throughout the cruise while in international waters. Data was logged in Kongsberg .all format. The centre beam depth was logged to Techsas and Level-C.
Single channel seismic reflectionQuantity: activity duration in days = 40
Description: The SBP120 Sub Bottom Profiler was run throughout the cruise while in international waters. There are breaks in the data due to the acoustic instrumentation being isolated during OBEM deployment and recovery. Data was recorded in Kongsberg raw format and in Seg-Y format.