Abstract
Pilot studies have investigated the sedimentological records of Lakes Bolsena, Bracciano and Albano (Latium, central Italy) for their climatic and tectonic histories. Literature has also been reviewed to assess the chronology of lake formation during the Pleistocene (for the above lakes ca. 150 ka, 100 ka, 50 ka BP, respectively) and for evidence that the large Lakes Bolsena and Bracciano were affected by young regional tectonic activity and are not typical caldera lakes. Our field studies, using a high resolution seismic reflection method (3.5 kHz system), focus on the sedimentary evolution of the above lakes. Seismic stratigraphy shows three units with similar characteristics in all three lakes: unit I, interpreted as Holocene deposits, overlies latest Glacial and last Glacial maximum sediments (unit II), over middle- and early-Würm deposits (unit III). Truncation of up to 50m-thick sediment packages on one side of both Lakes Bolsena and Bracciano is observed. The truncation was caused by faults which were probably active toward the end of the last Glacial. A shallowing-upward deepening-upward lacustrine sequence subsequently developed in places. Lake level changes appear to have been controlled by tectonic- and/or climatic boundary conditions for Lakes Bolsena and Bracciano. There is no evidence for synsedimentary faulting in the maar Lake Albano.
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Niessen, F., Lami, A., Guilizzoni, P. (1993). Climatic and tectonic effects on sedimentation in central Italian volcano lakes (Latium)—Implications from high resolution seismic profiles. In: Negendank, J.F.W., Zolitschka, B. (eds) Paleolimnology of European Maar Lakes. Lecture Notes in Earth Sciences, vol 49. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0117593
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DOI: https://doi.org/10.1007/BFb0117593
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