Publication: Depósitos de ápice de abanico (Terciario de la Cuenca del Tajo,
Madrid): sedimentología y controles sedimentarios
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Publication Date
1999
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Sociedad Geológica de España
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Abstract
The topmost alluvial deposits that outcrop adjacent to Central System igneous rocks are arranged in two
units with particular internal architecture. The lower unit consists of ten bodies laterally disposed and
bounded by concave erosional surfaces. These bodies record both viscous and f1uidized flows corresponding
to channelized debris-flows, torrential flows and single channel fluvial deposits. This unit is interpreted as
entrenched deposits at the head of the fan at the outlet of the catchment area. The c1ast-supported gravel
and boulder upper unit is arranged in near tabular bodies with erosional bases and internal smaller, single
channels and records the final stages of fan development when apex trench was buried and sheet-flows
developed. Lateral migration of bodies in both units record a stable tectonic setting and a slowly-rising or
near-equilibrium base-level, interpreted as the final stages of fan development in a almost-filled basin.