Erfahrungs- und Forschungsbericht 2012 - Ensi

Erfahrungs- und Forschungsbericht 2012 - Ensi

Dating Swiss Deckenschotter

using cosmogenic


Be and 26 Al

Author und Co-author(s) Naki Akçar 1 , Susan Ivy-Ochs 2 , Anne Claude 1 ,

Dmitry Tikhomirov 1 , Peter W. Kubik 2 ,

Christof Vockenhuber 2 , Christian Schlüchter 1



Institute of Geological Sciences, Bern University


Laboratory of Ion Beam Physics (LIP), ETH Zürich


Tel., E-mail, Internet address

Duration of project

Baltzerstrasse 1, 3012 Bern/Schweiz

+41 31 631 87 82,,

3 years


Our project employs burial, isochron-burial

and depth-profile dating with in-situ produced

cosmogenic nuclides 10 Be and 26 Al to date key

deposits of the Swiss Deckenschotter on the

northern Alpine Foreland. Five sites that are

under discussion for deep geological repositories

for nuclear waste disposal are located on

the northern Foreland. Our project began on

October 1 2012. During these three months,

we found a suitable PhD candidate. She has

been surveying the literature in order to build

her background on the Swiss Deckenschotter

and refining her analytical skills. In the field

meeting on March 30 2012, optimal sites

based on site character and knowledge gained

from the pilot project were discussed. As the

Deckenschotter sites have rather low cosmogenic

nuclide concentrations (especially 26 Al),

we are currently working on several fronts to

improve the AMS measurements, and thus,

reduce uncertainties. In 2013, our first task

will be the selection of the key sites for sampling.

Meanwhile, we will refine our analytic

capabilities for cosmogenic 26 Al, which is crucial

for application of burial and isochron-burial

dating. The first sampling campaign will take

place in the first half of 2013 after careful scrutiny

of potential sites. Earliest by late summer,

first results are expected to be gathered. While

doing these, we will profit from our know-how

from other projects within well-established

national and international collaborations, this

know-how will be directly transferred into our


ENSI Erfahrungs- und Forschungsbericht 2012 281

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