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Ifm-Geomar Report FS SONNE Fahrtbericht/Cruise Report SO208 Leg 1 & 2 Propagation of Galápagos Plume Material in the Equatorial East Pacific (PLUMEFLUX) Caldera/Costa Rica – Guayaquil/Ecuador 15.07. - 29.08.2010 LUM 08 P EFL 2 UX SO ts G 0 n u 1 u a 0 o y 2 . m a 7 a q 0 u . e i l 5 S / E 1 Dred c a ge u c a i d R o a r t 2 s 9 o . C 0 / 8 a r . 2 e 0 d l 1 a 0 C Rockdrill 2 IF M-GEOMAR IFM-GEOMAR REPORT Berichte aus dem Leibniz-Institut für Meereswissenschaften an der Christian-Albrechts-Universität zu Kiel Nr. 39 November 2010 FS SONNE Fahrtbericht/Cruise Report SO208 Leg 1 & 2 Propagation of Galápagos Plume Material in the Equatorial East Pacific (PLUMEFLUX) Caldera/Costa Rica – Guayaquil/Ecuador 15.07. - 29.08.2010 Berichte aus dem Leibniz-Institut für Meereswissenschaften an der Christian-Albrechts-Universität zu Kiel Nr. 39 November 2010 ISSN Nr.: 1614-6298 Das Leibniz-Institut für Meereswissenschaften The Leibniz-Institute of Marine Sciences is a ist ein Institut der Wissenschaftsgemeinschaft member of the Leibniz Association Gottfried Wilhelm Leibniz (WGL) (Wissenschaftsgemeinschaft Gottfried Wilhelm Leibniz). Herausgeber / Editor: Reinhard Werner, Folkmar Hauff and Kaj Hoernle IFM-GEOMAR Report ISSN Nr.: 1614-6298 Leibniz-Institut für Meereswissenschaften / Leibniz Institute of Marine Sciences IFM-GEOMAR Dienstgebäude Westufer / West Shore Building Düsternbrooker Weg 20 D-24105 Kiel Germany Leibniz-Institut für Meereswissenschaften / Leibniz Institute of Marine Sciences IFM-GEOMAR Dienstgebäude Ostufer / East Shore Building Wischhofstr. 1-3 D-24148 Kiel Germany Tel.: ++49 431 600-0 Fax: ++49 431 600-2805 www.ifm-geomar.de 1 CONTENTS Page Summary..........................................................................................................................................................2 Zusammenfassung..........................................................................................................................................3 1. Acknowledgements .....................................................................................................................................4 2. Participants..................................................................................................................................................5 2.1. Ship´s Crew ...................................................................................................................................5 2.2. Principal Investigators for PLUMEFLUX ......................................................................................5 2.3 Scientific Co-operators...................................................................................................................5 2.4 Shipboard Scientific Parties of SO208 Leg 1 and 2......................................................................5 2.5. Institutions......................................................................................................................................7 3. Major Objectives and Background of SO208 PLUMEFLUX (R. Werner, K. Hoernle, F. Hauff, A. Herbrich, B. Neuhaus, C. Lüter).................................................................................................................8 3.1. The Galápagos Plume – CNS System.........................................................................................9 3.2. Lateral Migration of Galápagos Plume Material.........................................................................10 3.3. Seamounts off Northern Costa Rica and Nicaragua .................................................................11 4. Cruise Narrative (R. Werner, K. Hoernle) ...............................................................................................12 5. Bathymetry and Rock Sampling (F. Hauff, A. Herbrich, D. Maicher, K. Hoernle, R. Werner)...............18 5.1. Methods .......................................................................................................................................18 5.1.1. Bathymetry.....................................................................................................................18 5.1.2. Rock Sampling...............................................................................................................19 5.2. Sampling Report and Preliminary Results .................................................................................20 5.2.1. SO208 Leg 1: Seamounts off Costa Rica and Nicaragua (DR 1-40, TVG 8+22).......20 5.2.2. SO208 Leg 2: Cocos-Nazca Spreading Center...........................................................35 Profile 1 (DR 44 – DR 74, TVG 43+70) .................................................................35 Profile 2 (DR 75 – DR 84) ......................................................................................39 Profile 3 (DR 85 – DR 98) ......................................................................................40 Profile 4 (DR 99 - DR 118) .....................................................................................43 Profile 5 (DR 119 – DR 121) ..................................................................................46 On-axis seamount at 87°45´W (DR 122 and TVG 123).........................................47 Leg 2 sampling summary ........................................................................................47 5.3. Volcaniclastic Rocks (D. Maicher) ..............................................................................................48 5.3.1. Terminology ...................................................................................................................48 5.3.2. PLUMEFLUX Volcaniclastic Deposits ..........................................................................49 Epiclastic volcanogenic depositis............................................................................49 Hyaloclastic pillow and sheet lava flow breccias....................................................49 Hyaloclastite, massive and bedded ........................................................................50 Limu-bearing hyaloclastite.......................................................................................51 Peperitic rocks .........................................................................................................53 Miscellaneous rocks ................................................................................................53 6. Sedimentology (E. Baldessin, P. Weber).................................................................................................54 6.1. Methods ..................................................................................................................................54 6.1.1. Shipboard Collecting Procedures .................................................................................54 6.1.2. Radiolaria.......................................................................................................................55 6.2. Expected Results.........................................................................................................................55 7. Biology (N. Furchheim, C. Lüter, B. Neuhaus, R. Seidel) .......................................................................56 7.1. Methods 7.1.1. Shipboard Collecting Procedures .................................................................................56 7.1.2. Meiofauna ......................................................................................................................56 7.1.3. Macrofauna ....................................................................................................................57 7.2. Preliminary Results and Discussion ...........................................................................................57 7.2.1. General Observations and Collecting Report...............................................................57 7.2.2. Meiofauna ......................................................................................................................58 7.2.3. Macrofauna ....................................................................................................................58 7.2.4. TV-Observation of the Sea Floor ..................................................................................59 8. References ................................................................................................................................................60 Appendices: I. Sampling Summary IIa. and b. Rock Description Leg 1 and Leg 2 III. Sediment Sampling IV. Biological Sampling V. Overview Map: SO208 Sampling Sites 2 SUMMARY The research project SO208 PLUMEFLUX (Propagation of Galápagos Plume Material in the Equatorial East Pacific) is funded by the German Ministry of Education and Research (BMBF) and focusses on seamounts on the Cocos Plate, formed at the East Pacific Rise but presently located off the coast of NW Costa Rica and Nicaragua (Leg 1), and on the Cocos-Nazca-Spreading Center (CNS; Leg 2). The studies conducted on cruise SO208 included multi-beam mapping, sediment echo sounding, hard rock sampling, as well as sedimentological and biological sampling. The major geological targets of Leg 1 were (1) to evaluate if the seamounts off northern Costa Rica and Nicaragua were formed by the Galápagos hotspot and thus to constrain the extent of influence by the Galápagos plume on the upper asthenosphere and lithosphere and (2) to constrain better the material input into the Central American subduction zone. Leg 2 aimed to sample profiles
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