Publication: Bioturbación en lagunas salinas (Lillo, Toledo): comparación con icnitas antiguas en rocas evaporíticas
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2012
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Sanz Montero, M. Esther
García del Cura, M. Ángeles
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Sociedad Geológica de España.
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Abstract
La presencia de seres vivos en los ambientes lacustres salinos se puede deducir por las estructuras de bioturbación que realizan en el sedimento. En las lagunas salinas manchegas de Lillo (Toledo) se ha distinguido un cortejo variado de dichas estructuras que se puede relacionar claramente con ambientes de sedimentación determinados. Entre las huellas de actividad de seres vivos observadas destacamos: las huellas de raíces de herbáceas, las huellas de raíces de arbustos, la bioturbación por larvas de dípteros (Ephydridae), las excavaciones y perforaciones por abejas y coleópteros y las huellas de vertebrados. La comparación de las estructuras de bioturbación actuales con las icnitas (trazas fósiles y rizolitos) que se encuentran en las facies evaporíticas continentales del Terciario peninsular permite precisar su caracterización y su interpretación dentro de los diferentes ambientes sedimentarios. De hecho, las interpretaciones de las icnitas que se habían realizado previamente a su comparación directa con las estructuras de bioturbación actuales coinciden en gran medida con las de las huellas de seres vivos recientes. Por tanto, se puede considerar a las lagunas salinas manchegas como un buen análogo de los lagos salinos terciarios de la Península Ibérica para análisis sedimentológicos de icnitas.
The occurrence of living beings in saline lake environments can be deduced thanks to bioturbation structures present in sediment. A varied assemblage of bioturbation structures--which can be tied to specific sedimentary subenvironments--has been recognised in saline ponds of La Mancha (Lillo-Toledo). The main groups of traces of bioturbation include: traces of grass roots, traces of bush roots, burrows made by larvae of Diptera (Ephydridae), and burrows and borings made by bees and beetles, as well as traces of vertebrates. Comparing recent bioturbation structures with ancient ichnites (trace fossils and rhizoliths) found in evaporite facies of the Tertiary continental geological record of Spain allows refining of their characterization and interpretation within different sedimentary ubenvironments. In fact, interpretations of ichnites made prior to direct comparisons with recent bioturbation structures largely coincide with those of recent traces of living beings. Therefore, the salt ponds of La Mancha can be considered as a good analog for Tertiary saline lakes of the Iberian Peninsula and subsequently for sedimentological analysis of ichnites.
The occurrence of living beings in saline lake environments can be deduced thanks to bioturbation structures present in sediment. A varied assemblage of bioturbation structures--which can be tied to specific sedimentary subenvironments--has been recognised in saline ponds of La Mancha (Lillo-Toledo). The main groups of traces of bioturbation include: traces of grass roots, traces of bush roots, burrows made by larvae of Diptera (Ephydridae), and burrows and borings made by bees and beetles, as well as traces of vertebrates. Comparing recent bioturbation structures with ancient ichnites (trace fossils and rhizoliths) found in evaporite facies of the Tertiary continental geological record of Spain allows refining of their characterization and interpretation within different sedimentary ubenvironments. In fact, interpretations of ichnites made prior to direct comparisons with recent bioturbation structures largely coincide with those of recent traces of living beings. Therefore, the salt ponds of La Mancha can be considered as a good analog for Tertiary saline lakes of the Iberian Peninsula and subsequently for sedimentological analysis of ichnites.