Friday, May 31, 2013

Highlights—Lacustrine-Paralic Genetic Stratigraphy

Sequence stratigraphy uses regionally correlative surfaces to subdivide a succession of strata; in nonmarine strata, marine flooding units can provide important tie points.  In this study, Ielpi documents several marine bands in late Miocene lacustrine-paralic deposits of the Northern Apennines and illustrates their use in basin and sedimentologic analysis.  The data reveal that low-frequency sequences bounded by major marine incursions are regionally correlative and respond to regional high-amplitude base level fluctuations; in contrast, nested high-frequency sequences are noncorrelative and respond to local low-amplitude base level fluctuations. The results are interpreted to underscore the role of differential subsidence in the generation of asymmetrical sequence architectures and the alternation between hydrologically balanced and underfilled phases in high-accommodation and low-topography settings.

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