Gypsum karst features as evidence of diapiric processes in the Betic Cordillera, Southern Spain

In the Triassic evaporite deposits of the Betic Cordillera, halokinesis has played a fundamental role in the morphodynamic evolution of gypsum karst, as evidenced by the morphology and distribution of dolines and poljes, by d ata obtained from caves, and from the types of water associated with evapor ite domes. Distribution patterns of major exokarstic forms display a subcir cular array with collapse sinkholes located in the centre of the domes and solution drawdown dolines on the outer limits of the diapiric forms. In add ition, the least mineralized waters are situated in association with the ca prock gypsum; hypersaline waters, which are also hotter, drain deeper flow systems that flow out at the edges of the halokinetic structures. The morph odynamic and hydrogeological information constitute a valuable tool for the correct interpretation of the tectonic structure of such complex areas. (C ) 1999 Elsevier Science B.V. All rights reserved.