A new Lateglacial chronostratigraphic tephra marker for the south-eastern Alps: The Neapolitan Yellow Tuff (NYT) in Längsee (Austria) in the context of a regional biostratigraphy and palaeoclimate
2002; Elsevier BV; Volume: 88; Issue: 1 Linguagem: Inglês
10.1016/s1040-6182(01)00072-6
ISSN1873-4553
AutoresRoland Schmidt, Christel van den Bogaard, Josef Merkt, Jens Daniel Müller,
Tópico(s)Archaeology and ancient environmental studies
ResumoLängsee is a small meromictic lake in Carinthia, SE Alps, with partially varved Lateglacial sediments. The Längsee tephra correlates to the Neapolitan Yellow Tuff (NYT), an eruption from the Campanian Volcanic Province, Italy. This tephra provides a Lateglacial chronostratigraphic time marker from central Italy across the Adriatic Sea to the southeastern Alps. The Längsee tephra is discussed in the context of pollen, geochemical, and microstratigraphical data from a profundal sediment core from Längsee. The age of 14,120 cal yr BP for the NYT has been accepted from the Monticchio chronology. The timescale for the Lateglacial in the Längsee record is based on laminae counts and has been linked to calendar year ages using the NYT tephrachronological marker. Consequently, the mass expansion of Betula has been dated at 14,270 cal yr BP. The expansion of P. sylvestris started concurrent with the NYT, and about 180 yr later, at 13,940 cal yr BP, P. sylvestris forests were established. The Younger Dryas biozone at Längsee is characterized only by a slight increase in non-arboreal pollen and dominated by pine with visible variations only in pine pollen types. Differentiation of pine pollen types allowed the recognition of three minor fluctuations during the Lateglacial interstadial. Two of these oscillations tentatively have been correlated with the Aegelsee and Gerzensee oscillations in Switzerland as well as with vegetation changes in NW Germany.
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