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- W2784569274 abstract "During the last season and ongoing planning, pre-site surveys are operated at the Ekstromisen, DronningMaud Land, close to the Neumayer-Station III, with the primary target to build a stratigraphic age frameworkof the under-shelf-ice-sediments. These sediments are overlying the Explora Wedge [1], [2], a syn- or postriftvolcanic deposit, and dipping north- to north-eastward. Expected ages could range from Late Mesozoic toQuaternary. From new vibroseismic profiles we will select sites for short core seafloor sampling of the oldestand of the youngest sediment sequences to confine their age time span.After that, we could select one or several sites for potential deep drillings (several hundred-meter-deep) withthe support of international partner, if we could rise interest. The deep drillings should recover the sedimentsoverlying the Explora Escarpment, and should discover the nature of the Explora Wedge as well. We expectthat the overlying sediment sequences could reveal the history of polar amplification and climate changes inthis part of Antarctica, the build-up of the East Antarctic Ice Sheet during past warmer climates and itsCenozoic and future dynamic and variability.The plan for seasons 2017/18 and 2018/19 are the testing of different sea floor sampling techniques throughHot Water Drill (HWD) holes. To select the drill sites for this shallow coring additional high resolution seismicwill be acquired as well.Having holes through the shelf ice and sampling the sea floor will provide the unique opportunity for furtherpiggy bag experiments consisting of multi-disciplinary nature. Experiments and measuring setup foroceanography, sea and shelf ice physics, geophysics, geology, hydrography, and biogeochemistry could beplanned to characterize the sea-ice and shelf ice system, underlying water column, and the sediments. Videocharacterization underneath the shelf ice and at the seafloor, sediment trap deployment, seafloor mappingwith an AUV (Leng, DFKI, ROBEX) could lead as well to innovative new interdisciplinary observations anddiscoveries of the sub-ice environment and ecosystem [3].References:[1] Eisen, O., Hofstede, C., Diez, A., Kristoffersen, Y., Lambrecht, A., Mayer, C., Blenkner, R. & Hilmarsson, S., (2015), On-ice vibroseisand snowstream¬er systems for geoscientific research, Polar Science, 51-65, 9, http://dx.doi.org/10.1016/j.polar.2014.10.003.[2] Kristoffersen, Y., Hofstede, C., Diez, A., Blenkner, R., Lambrecht, A., Mayer, C. & Eisen, O., (2014), Reassembling Gondwana: Anew high quality constraint from vibroseis exploration of the sub-ice shelf geology of the East Antarctic continental margin, J. Geophys.Res. Solid Earth, 9171-9182, 119[3] Kuhn, G. & Gaedicke, C., (2015), A plan for interdisciplinary process-studies and geoscientific observations beneath the Ekstrom IceShelf (Sub-EIS-Obs), Polarforschung, 99-102, 84" @default.
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- W2784569274 date "2017-09-01" @default.
- W2784569274 modified "2023-09-23" @default.
- W2784569274 title "Sedimentary sequences below the Ekström Ice Shelf, Dronning Maud Land, Antarctica: A pre-site survey for deep drilling (Sub-EIS-Obs)" @default.
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