Publication: Petrographic evidence of different provenance in two alluvial fan
systems (Palaeogene of the northern Tajo Basin, Spain)
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Publication Date
1991
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Geological Society of London
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Abstract
Palaeogene detrital deposits of the northern Tajo Basin are coalescent alluvial fan
systems interfingering distally with lacustrine carbonates. Non-carbonate extrabasinal clasts
increase to the east while carbonate extrabasinal clasts decrease. Rock fragments increase
to the west, while the feldspar/quartz ratio remains constant. Rock fragments define two
sedimentary domains: the Iberian, in the east, was derived from Mesozoic rocks of the
Iberian Range, and the Central System, to the west, was derived from Cretaceous cover and
Palaeozoic metamorphic basement. Evolution of sandstone composition is related to
erosion of the source areas and is different in the two domains. The tectonic setting is
apparently "recycled orogen", providing calcareous rock fragments are included in the total
lithic clasts.