Abstract
Confined fission track length analyses of apatites from the basement massifs of the western, central and eastern Pyrenees show a north-south regional trend in mean track length (MTL) and standard deviation (SD). High MTL (13.3–14.6 μm) and low SD (0.9–1.7 μm) in the north, and low MTL (11.9–13.9 μm) and high SD (1.3–3.2 μm) in the south are interpreted as recording rapid, Paleocene-Eocence uplift in the northern Pyrenees which, with related age data, pre-dates a protracted period of uplift/cooling in the southern Pyrenees. The difference in “style” of Tertiary uplift is attributed to the asymmetrical development of a Pyrenean wedge profoundly influenced by a strike-slip margin buttress inherited during the Cretaceous.
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