Report and preliminary results of RV METEOR Cruise M78/3. Sediment transport off Uruguay and Argentina: from the shelf to the deep sea ; 19.05.2009 – 06.07.2009, Montevideo (Uruguay) – Montevideo (Uruguay)

The waters off Uruguay and Northern Argentina offer the possibility to study sediment transport processes from ‘source-to-sink’ in a relatively small area. Quickly accumulated sediments are potentially unstable and might be transported downslope in canyons and/or on the open slope. Strong contour currents result in along-slope sediment transport. Within the scope of Meteor-Cruise M78/3 we investigated sediment transport and depositional patterns by means of hydroacoustic and seismic mapping as well as geological sampling with conventional coring tools and the new MARUM seafloor drill rig (MeBo). Geotechnical investigations were carried out with the aim to analyze the controlling parameters for the destabilization of the slope and the succeeding failure of a sediment body. Various types of sediment instabilities have been imaged in geophysical and core data, documenting particularly the continental slope offshore Uruguay to be locus of frequent submarine landslides. Apart from individual landslides, however, gravitational downslope sediment transport along the continental slope is restricted to the prominent Mar del Plata Canyon and smaller canyons identified in the bathymetric data. In contrast, many morphological features reveal that sediment transport is predominantly controlled by strong contour bottom currents. This suggests a significant impact of the western boundary currents on the overall architectural evolution of the margin. The investigations are related to projects of the DFG Research Center / Excellence Cluster 'The Ocean in the Earth System', University of Bremen, as well as the Excellence Cluster 'The Future Ocean', University of Kiel

2. Wochenbericht MSM32

FS Maria S. Merian Reise 32 Morphologie, Dynamik und Geogefahren von submarinen Rutschungen im Bereich des Agadir Canyons, NW Afrika Bremen - Southampton - Cádiz 2. Wochenbericht, 30.09.13 - 06.10.1

1. Wochenbericht M86/2

27.12.11 - 01.1.12 / FS METEOR Reise 86, Fahrtabschnitt 2, Cartagena - Brindi

Sedimentary processes in Lake Van: first results from a joint interpretation of seismic and drilling data

EGU2011-1847-3 Lake Van is a lake by volume of 607 km3 and a maximum depth of 450 meters in a tectonically active zone in eastern Anatolia, Turkey. In summer 2010, Lake Van was the target of a deep drilling campaign (PaleoVan) in the frame of ICDP (International Continental Scientific Drilling Program). Two sites were drilled based on reflection seismic data collected during a seismic campaign in 2004. Here we present a first joint interpretation of the seismic and drilling data. Interpretation of seismic reflection data from lake reveals three physiographic provinces: a lacustrine shelf, a lacustrine slope, and a deep, relatively flat lake basin. The most prominent features of the lacustrine shelf and slope are prograding deltaic sequences, numerous unconformities, submerged channels, as well as closely spaced U- and/or V-shaped depressions, reflecting the variable lake level history of Lake Van. The seismic units of the shelf are dominantly composed of low-to-good continuity, variable amplitude reflections interpreted as fluvial deposits. The lake consists of three prominent basins (Tatvan, Deveboynu, and Northern Basins), separated by basement highs or ridges (Ahlat Ridge). The seismic units corresponding to these basins mainly consist of low to very high amplitude, well-stratified reflection patterns. Chaotic reflections are seen in parts of these basins. The Deveboynu Basin consists mainly of chaotic reflections. The Tatvan and Northern Basins are characterized by an alternating succession of well-stratified and chaotic reflecting layers. The chaotic seismic facies are interpreted as slump and slide deposits, which are probably the result of quick lake level fluctuations and/or earthquakes. The moderateto high amplitude, well-stratified facies seen in the deep parts of the basins away from the terrigenous sediment sources are interpreted as lacustrine deposits and tephra layers. The total sediment thickness in the deep parts of the lake is over 400 m. Prominent clinoforms indicate the initial flooding of Lake Van about 500 ka ago. The acoustic basement and the sediments lying on top of the basement in the southern part of the lake are disrupted by various intrusions and extrusions suggesting active volcanism. Synthetic seismograms calculated based on core logging, wire-line logging and check shot data will allow the correlation between seismic and drill data. This approach will allow extrapolating the stratigraphy from the wells to 3D-space by using the seismic data

3. Wochenbericht M86/2

FS METEOR Reise 86, Fahrtabschnitt 2 Cartagena - Brindisi 3. Wochenbericht, 08.01.12 - 15.1.1

2. Wochenbericht M78/3a

28 Forscher vom Kieler Exzellenzcluster „Ozean der Zukunft“, vom IFM-GEOMAR und dem Bremer Zentrum für marine Umweltwissenschaften MARUM sowie Gäste aus Brasilien, Uruguay und Argentinien brechen am 18. Mai mit dem Forschungsschiff METEOR zur vierwöchigen Expedition M78/3a auf. Sie führt die Wissenschaftler vor die Küsten von Argentinien und Uruguay. Dort werden vor allem große Hangrutschungen und tief eingeschnittene Canyons detailliert vermessen und geologisch beprobt. Untersucht werden soll, wie und wo sich Sedimente ablagern, die an Land von Erosion und Verwitterung erzeugt werden. Das ausgewählte Seegebiet eignet sich dafür besonders gut, da unterschiedliche Transportprozesse dort auf engem Raum beobachtet werden können. Der Fluss „Rio de la Plata“ in Argentinien transportiert große Mengen Sediment in den Ozean. Teilweise bleiben sie auf dem flachen Schelf, teilweise wandern sie am Kontinentalhang abwärts in die Tiefsee und teilweise werden sie von starken Strömungen parallel zur Küste vertrieben. Hauptziel der Fahrt ist es, die Bedeutung der einzelnen Transportprozesse zu quantifizieren sowie die Stabilität des Hanges und die davon ausgehenden Gefahren abzuschätzen. FS METEOR Reise 78, Fahrtabschnitt 3a Rio de Janeiro-Montevideo-Montevideo 2. Wochenbericht, 25.05-01.06.0

1. Wochenbericht AL487

Erster und letzter Wochenberich

Music is Social: From Online Social Features to Online Social Connectedness

Despite the widespread adoption of social networks, the potential value of implementing similar opportunities for social interaction into online content consumption websites has received limited attention. What little research has been done suggests that there is significant potential in implementing social features onto these sites, since increased interaction can lead to higher engagement with the site, and to an increase in users\u27 willingness to pay for the site. Considering that music in an inherently social good, and that consumers desire the opportunity to involve social aspects into their consumption of music, this study develops a new approach to examine the specific types of features that can lead to a feeling of online social connectedness. Results suggest that this distinction is valuable, and the type of features that is most likely to lead to feelings of connectedness is highlighted. Implications for site developers and researchers are also discussed