Plattform Platform	Reise-Nr. Cruise-No.	Zeitraum Period	Projekt Project	Arbeitsgebiet Working area
Sonne1	SO206	30.05.2010 - 18.06.2010		NE Pacific (Limit 180?)

Fahrtleiter Chief Scientist	Institut Institute	Auslaufhafen Port of departure	Einlaufhafen Port of return	Stationskarte Station map	Schiffsroute Trackchart
Hensen Cristian	Leibniz-Institut fur Meereswissenschaften an der Universitat Kiel	Caldera	Caldera

Ziel der Reise / Objectives of Cruise:

The proposed cruise aimed at collecting essential seismic and geochemical data at and around cold seepage sites located on the active continental margin off Costa Rica in order to improve our knowledge on the subsurface structure of these features and by this get a better understanding of the dewatering system at an active and erosive continental margin. The major target sites were two mud volcano like structures (Mound 11/12) and a large-scale slide caused by subducting seamounts (Jaco Scarp) which both are key targets of IODP proposal 633 that aims to enhance the general understanding on complex forearc dewatering processes of an erosive subduction system. In order to approve drilling by IODP essential high-resolution seismic data were required. For this purpose a conventional MCS-streamer and 3-D SwathSeis system was applied. In addition to seismic investigations, geochemical and microbiological investigations were conducted at various cold seeps. Existing porewater data from these sites support the hypothesis that upward migration of fluids along deep-seated fault systems is an important mechanism of forearc dewatering. However, previously obtained geochemical information is not unambiguous, and hence additional samples were retrieved for analyses of noble and hydrocarbon gases, microbial populations and turnover rates, sediment biomarkers, and pore fluid composition.

Messungen / Measurements

Verankerungen / Moorings