Tertiary intrusives of the Central Alps: their tertiary uplift, erosion, redeposition and burial in the south-alpine foreland
Tertiary plutonite boulders embedded in the Oligocene-Miocene Gonfolite Lombarda Group («Molasse») of the southern Alpine foreland (Como-Varese region; Northern Italy) were sampled for K/Ar- and fission track dating. The data allow to reveal markedly different cooling patterns for two distinct textural types of tonalites («serizzo»). Dating of boulders emplaced in younger conglomerates (Miocene) demonstrate the deceleration of uplift in the hinterland during the Miocene. Some conclusions about the origin of the boulders are possible when the uplift data are compared with uplift patterns of the Central Alpine hinterland (Bergell; Mera valley; Passo San Jorio)