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handle: 10261/367080
[ES]: El campo de lavas generado tras la erupción del volcán Tajogaite (septiembre-diciembre 2021) en la isla de La Palma (Islas Canarias) ofrece un sustrato rocoso inerte idóneo para el estudio del proceso de biocolonización de lavas en islas volcánicas activas. Con el fin de estimar la susceptibilidad intrínseca del sustrato para el desarrollo de biofilms, se han identificado y muestreado cuatro tipos de lava: cordada, escoriácea, masiva y vacuolar. En todas ellas se han determinado parámetros directamente relacionados con la biorreceptividad, tales como: rugosidad superficial, porosidad conectada, distribución de tamaño de poro y coeficiente capilar. Los resultados muestran fuertes diferencias entre un tipo y otro de lava (porosidades variables entre 6% y 46%, coeficientes capilares con rangos entre 5 y 407 g/s0.5m2 ), incluso se han identificado variaciones significativas entre las superficies exteriores (enfriamiento rápido) y el interior del cuerpo de lava (enfriamiento lento) dentro de un mismo litotipo. Una segunda fase del estudio correlacionará los parámetros petrofísicos obtenidos con los resultados del ensayo de crecimiento controlado de biofilms en condiciones de laboratorio
[EN]: The lava field generated after the eruption of the Tajogaite volcano (September-December 2021) on the island of La Palma (Canary Islands) offers an inert rock substrate very interesting for the study of the biocolonization process of lavas in active volcanic islands. In order to estimate the intrinsic susceptibility of the substrate for biofilm development, four types of lava have been identified and sampled: cordate, scoriaceous, massive and vacuolar. In all of them, parameters closely related to bioreceptivity have been determined, such as surface roughness, connected porosity, pore size distribution and capillary coefficient. The results show strong differences between one type of lava and another (porosity variations between 6% and 46%, capillary coefficients ranging from 5 to 407 g/s0.5m2). Moreover, significant variations have even been identified between the exterior surfaces (rapidly cooling) and the interior of the lava (slowly cooling) considering the same lithotype. A second phase of the study will correlate the petrophysical parameters obtained with the results of the controlled biofilm growth test under laboratory conditions.
Este trabajo fue desarrollado en el marco del proyecto HIRES-SOM (TED2021-130683B-C22) financiado por MCIN/AEI/10.13039/501100011033
Resúmen de la comunicación presentada en el XI Congreso Geológico de España, Ávila, 2-6 de julio 2024
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Porosidad, Capilaridad, Vacuola, Basalto, Rugosidad
Porosidad, Capilaridad, Vacuola, Basalto, Rugosidad
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