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High-Resolution Deformation Rates Spain

Summary: High-Resolution
Deformation Rates Spain
David Anastasio, Ken Kodama,
Earth and Environmental Sciences,
Lehigh University
Josep Pares, Geological Sciences,
University of Michigan
Pico del Aguila, Spanish Pyrenees
Geology, topography, and surveyed growth strata
used to determine folding rates.
Using growth strata and high-resolution age determinations constrained by magnetostratigraphy
and cyclostratigraphy we show that folding at Pico del Aguila anticline in the Spanish Pyrenean
foreland was non-steady over a 5 Myr period. Growth strata at Pico del Aguila include Middle
Eocene carbonates (Guara Fm.), marine slope (Arguis Fm.), and deltaic (Belsué-Atarés Fm.)
deposits. Anhysteretic remanent magnetization (ARM) data from the Arguis Fm. show
hierarchical cyclicity consistent with all predicted orbital Milankovitch frequencies. Differential
lithologic decompaction was applied using empirical calibration of anisotropy of anhysteretic
remanence (AAR) to volume loss from laboratory compaction experiments on comparable
lithologies. The ARM depth domain is converted to time by scaling the data to a revised
magnetostratigraphy within the growth section. We refine the magnetostratigraphic time scale by


Source: Anastasio, David - Department of Earth and Environmental Sciences, Lehigh University


Collections: Geosciences