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Natural and human-induced dissolution and subsidence processes in the salt outcrop of the Cardona Diapir (NE Spain)

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Environmental Geology

Abstract

The Cardona Diapir in NE Spain, with a salt outcrop about 0.9 km2 in area, has a well-developed endokarstic system that used to discharge into the Cardener River. Underground mining for potassium salt carried out from 1930 to 1990 caused significant changes in the topography and hydrology of the diapir. The accumulation of two halite slag heaps, totalling around 10 million tons, locally dammed the surface drainage, creating closed depressions and preferential zones of water recharge. The waters that infiltrated in one of these depressions, largely derived from uncontrolled sewage disposal, led to the generation of a 335-m-long human-induced cave excavated in one of the slag heaps. Moreover, the inflow of freshwater from the surrounding sandstone aquifer, caused by the excavation of a ventilation gallery, resulted in the generation of a 280-m-long cave. In March 1998, the interception of a phreatic conduit by a halite mine gallery 50 m deep caused dramatic changes in the hydrology and geomorphology of the diapir, including: (a) a sudden decline in the piezometric level of the karstic aquifer; (b) the inflow of freshwater and debris from the Cardener River into the endokarstic system and the mine galleries. A tunnel had to be constructed to divert the river flow from the salt outcrop; (c) massive dissolution of salt, creating new cavities and enlarging the pre-existing ones, including both mine galleries or cave passages. The 4,300-m-long Salt Meanders Cave was largely generated by the inrush of water from the Cardener River into the mine galleries; and (d) the generation of a large number of sinkholes in the vicinity of the Cardener River. An inventory of 178 sinkholes has allowed us to estimate minimum probability values of 4.7 and 8 sinkholes/km2·year for time intervals previous and subsequent to the 1998 mine flood event, respectively.

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Acknowledgments

The authors would like to thank Dr. Kenneth S. Johnson and Dr. Stanley T. Krukouski for the thorough review of the manuscript. This work has been partially co-financed by the Spanish Education and Science Ministry and the FEDER (project CGL2004-02892/BTE).

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Authors and Affiliations

  1. Edificio Geologícas, C/. Pedro Cerbuna 12, 50009, Zaragoza, Spain

    P. Lucha, F. Gutiérrez & J. Guerrero

  2. C/. America 29 bis, 08041, Barcelona, Spain

    F. Cardona

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  1. P. Lucha
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  2. F. Cardona
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  3. F. Gutiérrez
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  4. J. Guerrero
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Correspondence to P. Lucha.

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Lucha, P., Cardona, F., Gutiérrez, F. et al. Natural and human-induced dissolution and subsidence processes in the salt outcrop of the Cardona Diapir (NE Spain). Environ Geol 53, 1023–1035 (2008). https://doi.org/10.1007/s00254-007-0729-3

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