Luminescence dating of speleothems from Granite Caves

• Autores: Jorge Sanjurjo Sánchez, Juan Ramón Vidal Romaní, Marcos Vaqueiro Rodríguez, Costas Vázquez, Carlos Arce
• Localización: Avances de la Geomorfología en España 2012-2014 / coord. por Susanne Cecilia Schnabel, Álvaro Gómez Gutiérrez, 2014, ISBN 978-84-617-1123-9, págs. 474-477
• Idioma: español
• Títulos paralelos:
  • Datación por luminiscencia de espeleotemas en Cavidades Graníticas
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• Resumen

  • Water trickling through the discontinuities of granitic massifs causes slow rock weathering resulting in speleothems within rock fissures. Geochemical studies have shown different mineral compositions although evansite, opal-A and pigotite are the most frequent. They grow by accretion of concentric layers and they are a suitable microenvironment for the settlement of organisms, spores and pollen grains, which could be used as paleoclimatic records if the speleothems were dated. As Opal-A and evansite usually contain quartz- and feldspar-rich detrital grains Optically Stimulated Luminescence (OSL) has been tested for dating, while 14C dating was tested on pigotite due to their organic matter content. Results show ages between 0.5 and 3 ka BP.