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The significance of giant seismites in the Plio-Pleistocene Baza palaeo-lake (S Spain)

AuthorsAlfaro, P.; Gibert, Luis; Moretti, Massimo; García-Tortosa, Francisco Juan; Sanz de Galdeano, Carlos ; Galindo-Zaldívar, Jesús; López-Garrido, A. C.
Issue DateJun-2010
CitationTerra Nova 22(3): 172-179 (2010)
AbstractGiant load-type seismites, uncommon in the geological record, are described in Plio-Pleistocene lacustrine deposits of the Baza Basin (Betic Cordillera, S Iberia). Deformed beds of the marginal lacustrine and distal alluvial facies of the Baza palaeo-lake can be traced continuously for several kilometres. Soft-sediment deformation is represented by load-type structures of large dimensions (pillows around 4 m in width and 2 m in height). Three-dimensional exposures show ellipsoidal pillows separated by fluidized channels without any preferred orientation. The final size of these load-type seismites is strongly influenced by sedimentary factors such as the presence of a reverse density gradient in sediments and the bed thickness. The giant seismites of the Baza basin are located in a region, which is unlikely to have been subjected to high magnitude earthquakes (maximum around 7.0). Therefore, magnitude is not the main factor that controls the size of these load-type structures.
Description8 páginas, 8 figuras.
Publisher version (URL)http://dx.doi.org/10.1111/j.1365-3121.2010.00930.x
Appears in Collections:(IACT) Artículos
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