New Publication (April 2020): Ceccato et. al. Journal of Structural Geology

Ceccato, A.; Menegon, L.; Warren, C.J. and Halton, A.M. (2020). Structural and metamorphic inheritance controls strain partitioning during orogenic shortening (Kalak Nappe Complex, Norwegian Caledonides). Journal of Structural Geology (Early access).

This paper, recently made available online looks at structural, petrological and geochronological analyses performed on samples on a NW-SE cross section of the Kalak Nappe Complex (KNC) exposed on Kvaløya Island (Finnmark, Norway), in order to define pre-Caledonian or Caledonian deformation fabrics. Nappes within the KNC experienced different pre-collision tectonometamorphic histories, resulting in contrasting pre-Caledonian fabrics, which in turn controlled orogen-scale strain partitioning and metamorphic re-equilibration during Caledonian shortening.

The Ar isotopic system in the synkinematic micas appears to have been affected by infiltration of radiogenic 40Ar-rich fluids, making interpreting the Argon data from these and similar samples tricky!