Quaternary uplift of southern Italy

摘要: Dramatic coastline changes demonstrate rapid Quaternary uplift of Calabria in southern Italy. Because most the west (Tyrrhenian Sea) coast is normal fault bounded, previous work has asserted that its local footwall related to extension. However, east (Ionian also uplifting but not bounded. This reanalysis, based on original fieldwork and reinterpretation literature, reaches following conclusions. First, although radiometric dating only one marine terrace sequence available, at Crotone, terraces occur similar elevations, can thus be correlated, throughout this northern central Calabria. Uplift rate both coasts across region between same, 1.0 ± 0.1 mm yr−1, provided my correlations are correct. Second, oldest raised shorelines date from 0.9 Ma highstand have uplifted ∼700 m since ∼0.7 Ma. Regional earlier was minimal, possibly zero. Third, localities show marginally (up ∼5%) higher rates, indicating some (at ∼0.05 yr−) associated with slow extension ∼0.1 yr−1). Fourth, 12-m Holocene formed around 7 ka. Allowing for a 3-m range wave tidal action, it interpreted as result tectonic 2 eustatic sea level fall during ∼6–4 Finally, shows significant elevation caused by active faulting, well regional uplift. Footwall up 1300 The estimated maximum present-day 1.67 yr−1 1 yr plus 0.67 uplift, much faster than farther north. It suggested Tyrrhenian Benioff zone detached beneath shortly before 0.7 overlying landmass explained transient isostatic response removal load. Order-of-magnitude calculations suggest reasonable, ∼2 km total expected, will continue > ∼1 Myr into future. Extension appears begun ∼11 Ma, same time formation Sea subduction zone. abruptly increased 0.9–0.7 Ma., when slab began; continues before.