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dc.contributor.authorHuerta, Pedroes_ES
dc.contributor.authorMartín-Pérez, Andreaes_ES
dc.contributor.authorMartín-García, Rebecaes_ES
dc.contributor.authorRodríguez-Berriguete, Álvaroes_ES
dc.contributor.authorIglesia, A. laes_ES
dc.contributor.authorAlonso-Zarza, Ana Maríaes_ES
dc.identifier.citationSedimentary Geology 383: 136-147 (2019)es_ES
dc.description.abstractLava tubes from Lanzarote Island in the Canary Archipelago commonly show white speleothems that stand out from the black basaltic rock. Mineralogical analyses of the speleothems from El Covón and Chifletera lava tubes show that gypsum is the dominant mineral with minor amounts of halite. Speleothems composed of microcrystalline gypsum (up to 150 μm long) are: coatings, globules, or extensive white powder accumulations covering the tube floor. Those composed of macrocrystalline gypsum with millimetric-size tabular and lenticular crystals are: crusts and stalactites. Uranium series dating of speleothems show ages ranging from 6217 ± 1644 yr to 40,039 ± 4748 yr. δ34S and the δ18O of gypsum speleothems (δ34S is 20.97‰ V-CDT and δ18O is 9.78‰ V-SMOW) is similar to that of sulphate dissolved in seawater. 87Sr/86Sr from speleothems (0.708665–0.708976) suggests that the main source of Ca is seawater, but additional Ca contributions from aeolian dust have reduced the Sr isotope values. These data support the idea that gypsum precipitates in the lava tube by evaporation of marine spray or solutions derived from marine spray. Two probable vias for ions input into the lava tube are considered: 1) sea spray circulating through the lava tube; 2) low-frequency rain infiltration leaching the marine spray salts precipitated at the surface. The constant supply of ions from sea spray, air currents in the cave, and the fast, but partial, evaporation due to the high relative humidity in the lava tube favours accumulation of major amounts of gypsum and subordinately halite. Scarcity of precipitation in the western Canary Islands prevents dissolution of gypsum speleothems.es_ES
dc.description.sponsorshipThis research has been funded by the research project CGL2014-54818-P from the MINECO.es_ES
dc.subjectGypsum speleothemses_ES
dc.subjectSulphur isotopeses_ES
dc.subjectStrontium isotopeses_ES
dc.subjectMarine sprayes_ES
dc.subjectLava tubees_ES
dc.titleGypsum speleothems in lava tubes from Lanzarote (Canary Islands). Ion sources and pathwayses_ES
dc.description.peerreviewedPeer reviewedes_ES
dc.contributor.funderMinisterio de Economía y Competitividad (España)es_ES
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