Publication: Caracterización mineralógica de los depósitos holocenos del Marjal de Almenara (Castellón-Valencia, España). Implicaciones paleoambientales
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Publication Date
2016
Authors
Moral González, Begoña del
Mediato Arribas, José Francisco
Ugarte, Ernesto
Mediavilla López, Rosa María
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Sociedad Geológica de España.
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Abstract
Se presenta la mineralogía de los depósitos holocenos del Marjal de Almenara, en las costas de Castellón-Valencia. Las variaciones en la composición de las asociaciones minerales y su relación con los ambientes de sedimentación permiten conocer en detalle los controles sedimentarios. Se ha realizado el estudio sobre 41 muestras procedentes de tres sondeos que están agrupadas en función de 6 facies sedimentarias. La relación entre la mineralogía y las facies muestra que el aporte de filosilicatos (illita, fundamentalmente) hacia el humedal proviene de las áreas continentales, donde predominan los depósitos aluviales (mantos de arroyada), mientras que el cuarzo procede de los depósitos marinos litorales (washover-fan). Las facies lacustres conforman un cinturón de facies que se distribuye desde más someras, arcillas y turbas, a más profundas, fangos carbonáticos y carofítas. La mineralogía de estas facies indica: que las arcillas sufren procesos post-deposicionales ligados a los periodos inundación y desecación; y que la facies de turbas, situada en la zona sublitoral detiene el aporte de terrígenos (cuarzo y filosilicatos) hacia el centro del humedal donde se ubican los fangos carbonáticos y niveles de concentración de caráceas formados principalmente por calcita.
This paper shows the mineralogy of Holocene deposits of the Almenara Marsh, on the Castellón-Valencia coasts. The changes in the mineral associations and their relation with sedimentation environments allow a detailed knowledge of the sedimentation controls. The study was performed in 41 samples from three long well cores being grouped in six sedimentary facies. The relationship between mineralogy and facies shows that the input of phyllosilicates (illite, mainly) to the wetland comes from inland areas where alluvial deposits (sheet-flood) predominate, while quartz comes from coastal marine deposits (washover-fan). Lacustrine facies form a facies belt that ranges from shallower clays and peats facies, to deeper carbonate mud and charophytes. The mineralogy of these facies shows up: clays facies undergo post-depositional processes linked to flooding and drying periods; and the peats facies, located on the subtidal zone, capture the supply of terrigenous (quartz and phyllosilicates) towards the center of the wetland where carbonate mud and charophytes facies, composed mainly of calcite, are located
This paper shows the mineralogy of Holocene deposits of the Almenara Marsh, on the Castellón-Valencia coasts. The changes in the mineral associations and their relation with sedimentation environments allow a detailed knowledge of the sedimentation controls. The study was performed in 41 samples from three long well cores being grouped in six sedimentary facies. The relationship between mineralogy and facies shows that the input of phyllosilicates (illite, mainly) to the wetland comes from inland areas where alluvial deposits (sheet-flood) predominate, while quartz comes from coastal marine deposits (washover-fan). Lacustrine facies form a facies belt that ranges from shallower clays and peats facies, to deeper carbonate mud and charophytes. The mineralogy of these facies shows up: clays facies undergo post-depositional processes linked to flooding and drying periods; and the peats facies, located on the subtidal zone, capture the supply of terrigenous (quartz and phyllosilicates) towards the center of the wetland where carbonate mud and charophytes facies, composed mainly of calcite, are located