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Projekt Druckansicht

Untersuchungen zur Chronologie der quartären fluvialen Einschneidung im unteren Moseltal (westliches Rheinisches Schiefergebirge): Datierung von Terrassensedimenten mittels kosmogener Nuklide (10Be und 26Al)

Antragsteller Dr. Gilles Rixhon
Fachliche Zuordnung Physische Geographie
Paläontologie
Förderung Förderung von 2013 bis 2018
Projektkennung Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 243104380
 
Erstellungsjahr 2017

Zusammenfassung der Projektergebnisse

In the framework of this project, we used (i) electron spin resonance (ESR), (ii) terrestrial cosmogenic nuclides (TCN; 10Be and 26Al) and (iii) palaeomagnetism to date the upper terrace flight of the lower Moselle valley, with a specific emphasis on the MTC. (i) ESR measurements on quartz yielded two age clusters for the MTC, one around 0.5 Ma and the other around 1.2 Ma. Whilst the second time span is in good agreement with ESR-inferred ages of MTC deposits in the Saar valley, it highlights the need to crosscheck the reliability and robustness of these ages. As for ESR dating, we also recommend using the multiple centre approach. (ii) Unlike isochron burial dating, unaffected by postdepositional reworking or erosion processes, the depth profile technique is very sensitive to these. We therefore state that the first method is more suitable and robust than the second to date Early Pleistocene terrace deposits. The robust burial age points to a formation time around 1.2 Ma for the MMT. (iii) Palaeomagnetic measurements in the MMT and the YMT highlighted two reverse-to-normal polarity reversals. While the first one can be reliably correlated with the Jaramillo Event, the second might identify the Brunhes/Matuyama boundary. These results are in good concordance with the TCN-derived chronology. Whilst further chronological data are still required to decipher the complex interactions ruling the incision in the lower Moselle, the vast majority of our results points to an older timespan for the formation of the MTC than previously suggested (i.e. Early Pleistocene formation age). This represents the main chronostratigraphical outcome of this project. Importantly, this statement probably imposes to fundamentally revise the whole chronological framework for river incision in the Rhenish massif, especially in the middle Rhine valley.

Projektbezogene Publikationen (Auswahl)

 
 

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