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Título
Palaeoshoreline for the Late Cretaceous marine platform in the Iberian Trough (Leonese Area, Spain) deduced from outcrop and subsurface analysis
Autor
Facultad/Centro
Área de conocimiento
Título de la revista
Open Geosciences
Número de la revista
3
Datos de la obra
Herrero-Hernández, A., & Gómez-Fernández, F. (2012). Palaeoshoreline for the late cretaceous marine platform in the iberian trough (Leonese Area, Spain) deduced from outcrop and subsurface analysis. Central European Journal of Geosciences, 4(3), 395-415. https://doi.org/10.2478/S13533-011-0067-6
Editor
Springer Nature
Fecha
2012
Resumo
[EN] The location of the Late Cretaceous paleoshoreline in the Leonese Area (Iberian Trough, Spain) has been
investigated by seismic analysis through isobath and isopach maps.
The succession can be divided into two depositional sequences: DS-1 and DS-2. These sequences are
composed of fluvial systems at the base, with paleocurrents that flowed eastward and north-eastward. The
DS-1 sequence (Late Albian-Middle Turonian) shows intertidal to subtidal and offshore deposits at the top, while
the DS-2 sequence (Late Turonian-Campanian) presents intertidal to subtidal, tidal flat and shallow marine and
lacustrine deposits at its top.
The stratigraphic cyclicity based on systems tracts shows that these two depositional sequences exhibit
remarkable eustatic control. Both sequences start at the base with a significant sedimentary supply from fluvial
systems, related to eustatic fall episodes, and conclude at the top with transgressive periods. The evolution of
the basin reveals the history of base-level changes and associated shifts in depositional trends during successive
stages.
The deeper sectors of the DS-1 sequence are located towards the northeastern part of the study area while the
proximal portion of the basin-margin is located to the southwest. The paleoshoreline is placed in a direction
oriented at 120. The variations in thickness are elongated in orientations between 030 and 050 and are mainly
related to paleovalleys and tributary fluvial networks that supply sediment through the shoreline. It is possible that
these variations may be related to active synsedimentary faults.
Depocenters move toward the northeast and east during the DS-2 sequence while the proximal portion of
the basin-margin moves to the southwest. The paleoshoreline has an orientation of 155 direction and moves
basinward. The isopach maps show a group of corridors oriented at 130-140 and 165-170, interpreted as result
of accumulation of sandy bodies such as inter and subtidal bars. The fluvial systems are transversal to the
paleoshoreline direction
Materia
Palabras clave
Peer review
SI
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