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Contrasting palaeosol development in two different tectonic settings: the Upper Buntsandstein of the Western Iberian Ranges, Central Spain

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Alonso-Zarza, Ana María y Sopeña, Alfonso y Sánchez Moya, Yolanda (1999) Contrasting palaeosol development in two different tectonic settings: the Upper Buntsandstein of the Western Iberian Ranges, Central Spain. Terra nova, 11 . pp. 23-29. ISSN 0954-4879

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URL Oficial: http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-3121



Resumen

Palaeosols may offer excellent evidence for the development of sedimentary basins but few studies have used diagenetically altered material: here we show that material of this sort can also reflect the sedimentary environment. The Lower to Middle Triassic red beds of the western Iberian Ranges were deposited in a tectonically active half-graben in which subsidence rates varied along the basin as a response to differential fault movements. During this period the basin was filled by a set of fluvial units with interbedded palaeosols. The palaeosols show typical pedogenic calcrete profiles, although extensive dolomitization has deleted part of their microstructure; however, macrostructure and morphology are preserved. Differences in the maturity stages of the palaeosols are related to the changes in subsidence and sedimentation rates along the basin. Thus, two different scenarios are recognized at: (i) the hanging wall, Riba de Santiuste area, where palaeosols reach stage III as the episodic tilting of the floodplain inhibited the development of more mature soils and (ii) the footwall, Cercadillo area, where palaeosols attain stage V maturity, favoured by prolonged periods of tectonic stability resulting in lower sedimentation rates over the floodplain areas.


Tipo de documento:Artículo
Palabras clave:Buntsandstein, Palaeosol development, Western Iberian Ranges, Central Spain
Materias:Ciencias > Geología > Geología estratigráfica
Ciencias > Geología > Paleontología
Código ID:25382
Depositado:12 May 2014 08:07
Última Modificación:12 May 2014 08:07

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