%0 Journal Article
%A García Frank, Alejandra
%A Ureta Gil, María Soledad
%A Mas Mayoral, José Ramón
%T Aalenian pulses of tectonic activity in the Iberian Basin, Spain
%D 2008
%@ 0037-0738
%U https://hdl.handle.net/20.500.14352/49565
%X In the northwest Iberian Range the Aalenian to Bajocian interval is represented by condensed, as well asmore expanded marine carbonate strata deposited in a shallow epicontinental-sea setting. Precisebiochronological data (successive ammonites assemblages) from 29 measured sections, along with a bedby-bed facies analysis, allowed a detailed correlation between sections, the definition of a number ofsuccessive transgressive–regressive cycles and of two distinct sedimentation areas, as well as the compilationof isopach maps for short time intervals (duration of ammonites Zone/Subzone) and the assessment ofsediment accumulation rates.Differences in facies and thickness in the studied interval, and the sequential organization, reveal significantchanges in the depositional environment. A tectonically-controlled compartmentalization of the sedimentationarea is suggested by a detailed reconstruction of the accumulation history. An active extensional tectonicregime is supported by contemporaneous volcanic activity in the southeastern Iberian Basin.A precise timing of the main tectonic pulses recorded in NW Iberian Basin for the Upper Toarcian–LowerBajocian interval is presented, which may help to better resolve the stratigraphy in otherW European duringthis time interval.
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