 |
| Titel |
The first continuous Younger Dryas varve chronology from Northeastern Germany: the Rehwiese palaeolake record (Berlin) |
| VerfasserIn |
Ina Neugebauer, Nadine Dräger, Peter Dulski, Birgit Plessen, Ulrike Herzschuh, Achim Brauer |
| Konferenz |
EGU General Assembly 2011
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250050604
|
|
|
|
|
|
| Zusammenfassung |
| Varved lake sediments of the palaeolake Rehwiese, SW-Berlin, provide climatic and
environmental information of the last Glacial to Interglacial transition (LGIT) in northeastern
Germany on a sub-annual timescale. Rehwiese sediments contain an approximately 3 m thick
sequence of continuous biochemical calcite varves, covering the time interval from
the early Allerød to the onset of the Holocene. A distinct volcanic ash layer has
been correlated with the late Allerød Laacher See Tephra (LST) which has been
dated at 12,880 varve years BP in varved lake sediments of Lake Meerfelder Maar,
Eifel (Brauer et al., 1999). A 1,400-year varve chronology with the LST forming
the basal chronostratigraphic marker horizon has been established through annual
layer counting in petrographic thin sections, comprising the late Allerød and the
Younger Dryas until the onset of the Holocene. Pollen data provide biostratigraphical
background for the Weichselian lateglacial classification. Based on precise varve
counting microfacies analyses on large-scale thin sections in combination with μXRF
element scanning data (Brauer et al., 2009) allow to discuss even seasonal aspects
of climate and environmental change. In addition, stable isotopes on authigenic
calcite (δ18O, δ13C), TOC and C/N-ratio analyses have been performed with a
five-year resolution. These high-precision multi-proxy data provide new insights into
the inter-annual and decadal-scale variability during the course of the Younger
Dryas.
Brauer, A., Endres, C., Günter, C., Litt, T., Stebich, M. & J.F.W. Negendank (1999): High
resolution sediment and vegetation responses to Younger Dryas climate change in varved lake
sediments from Meerfelder Maar, Germany. - Quaternary Science Reviews 18,
321-329.
Brauer, A., Dulski, P., Mangili, C., Mingram, J. and J. Liu (2009): The potential of
varves in high resolution paleolimnological studies. - PAGES news 17/3, 96-98. |
|
|
|
|
|
|