GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 1.1 GNGTS 2023 (3) Enhanced efficiency of regular fluvial discharge in humid and cold climatic conditions at the last stage of the Little Ice Age. Fig. 2 Synthetic conceptual model showing the origin and subsequent evolution of the Moo and Bino lakes. (A) Pre-failure stage: Serpentinized peridotites side of Mt. Ragola with foliation parallel to slope; (B) Initiation phase of the DSGSD destabilization, starting in 9.600 B.P. and continuing through the Holocene Climatic Optimum; (C) Recent structural control phase characterized by an abandonment of the southern part and shifting toward the N of the lake Moo lacustrine basin depocenter to its current position. Modified from Segadelli et al. (2022). Furthermore, it is worth noting that a good match exists between these structural features, the trend of the potentially active faults recognized in the study area, and the alignment and cluster trends of the epicenters of historical earthquakes (Fig. 3). Overlying this integrated information on the overall regional seismotectonic setting allows correlation of the identified morphostructures and recently active tectonic lineaments, trending NW–SE, NE–SW, and NNE–SSW and mainly characterized by normal oblique slip and strike-slip movements. Notably normal and dextral strike slip focal mechanisms were extrapolated for clusters of seismic events (from 2 ≤ M ≤ 4.4) aligned along a NW-SE lineament that intersects the Lake Moo basin (Perotti et al. 1988). This structure is interpreted as responsible for the linear topographic features and, in synergy with the climatic scenario described above, for the segmentation of the lacustrine basin. The proposed multidisciplinary analytical workflow highlights the importance of minor mountain lake environments and peat bogs as high-resolution geological archives. Such an approach might be implemented in other similar settings, characterized by limited outcrop conditions due to