RT Journal Article T1 Estacionalidad de la laminación espeleotémica de las Cuevas de Ortigosa de Cameros (La Rioja): aproximación experimental T1 Seasonal pattern of speleothemic lamination in the Ortigosa de Cameros Caves (La Rioja): an experimentalapproach A1 Muñoz Jiménez, Arsenio A1 Osácar, María Cinta A1 Sancho, Carlos AB Monitoring of both carbonate precipitation process and environmental parameters inside two cavesin Ortigosa de Cameros (La Rioja, Spain) has allowed us to establish the seasonality of speletohem laminationin these caves. Temperature record shows a minimum in March-June and a maximum in August with littleoscillation (< 1ºC). Drip water flow is maximum in autumn and spring. The carbonate record displayswhite porous laminae (WPL) and dark compact laminae (DCL) of seasonal origin. DCL are organic matterrich and form in high drip water flow periods, when soil organic matter is flushed into the caves. Stableisotope analyses of drip water (δ18O and δD) and carbonate (δ18O and δ13C) confirm the seasonal pattern:δ13C minimus correspond to the warm seasons (WPL) while δ18O pattern can be explained on the basis ofthe corresponding drip water δ18O variations YR 2009 FD 2009 LK http://hdl.handle.net/10272/8036 UL http://hdl.handle.net/10272/8036 LA spa DS Repositorio Institucional de la Universidad de Huelva RD 30 may 2026