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Mollusca stable isotope record of a core from Lake Frassino, northern Italy: hydrological and climatic changes during the last 14 ka

Dipartimento di Scienze della Terra, University of Pisa, Via S. Maria 53, 56126 Pisa, Italy

Giovanni Zanchetta

Dipartimento di Scienze della Terra, University of Pisa, Via S. Maria 53, 56126 Pisa, Italy, zanchetta{at}dst.unipi.it

Anthony E. Fallick

Scottish Universities Environmental Research Centre, East Kilbride, Glasgow G75-0GF, UK

Antonio Longinelli

Dipartimento di Scienze della Terra, University of Parma, Parco area delle Scienze 157, 43100 Parma, Italy

A core retrieved from Lake Frassino (northern Italy) provided evidence of palaeohydrological change in this area during the last 14 ka. Lithological, malacological and, in particular, stable isotope composition of freshwater shells allowed the delineation of the main phases of lake evolution between the Lateglacial and Holocene. Lateglacial conditions were drier than the Holocene, although a wetter period was inferred before c. 14 ka. According to the oxygen isotope composition of freshwater shells, the Holocene showed a clear bipartition. The first part, which lasted from 9100 to 7000 yr BP, was drier and was followed by a rapid increase in humidity at 7000-6800 yr BP. Between 6800 and 5000 yr BP, there were wetter and more stable conditions, as indicated by smaller ¹⁸O oscillations of Pisidium and Valvata shells. From c. 5000 to 2600 yr BP the record is characterized by larger fluctuations, which may indicate that short-term and particularly pronounced alternation of wet and dry periods occurred.

Key Words: Stable isotopes • lake level • hydrological change • climatic change • Lateglacial • Holocene • Northern Italy • molluscs

The Holocene, Vol. 16, No. 6, 827-837 (2006)
DOI: 10.1191/0959683606hol975rp


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