Abstract
Oligocene to Miocene clastic sediments of the Tertiary Piedmont Basin (northwest Italy) were derived from erosion of Western Alps source rocks. Detrital white micas from dif- ferent stratigraphic units and from sands of three present-day rivers draining the internal Western Alps have been analyzed by 40 Ar/ 39 Ar geochronology. Our data suggest a wide- spread, fast cooling and exhumation event prior to ca. 38 Ma followed by a .30 m.y. period of slower cooling and exhumation combined with erosion of crustal rocks with uniform 40 Ar/ 39 Ar signatures. These processes have resulted in a pattern of regularly increasing lag time up section.
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