Sinkholes in hypogene versus epigene karst systems, illustrated with the hypogene gypsum karst of the Sant Miquel de Campmajor Valley, NE Spain

Gutiérrez, F. (Universidad de Zaragoza) ; Fabregat, I. (Universidad de Zaragoza) ; Roqué, C. ; Carbonel, D. (Universidad de Zaragoza) ; Zarroca, M. ; Linares, R. ; Yechieli, Y. ; García-Arnay, Á. (Universidad de Zaragoza) ; Sevil, J.

Resumen: The Garrotxa-Banyoles artesian aquifer system in NE Spain includes zones with epigene and hypogene evaporite karst and sinkhole development. The sinkhole fields related to hypogene evaporite dissolution are associated with the discharge zones of the aquifer, where groundwater from a confined limestone rises traversing an overlying gypsum formation capped by thick marls. This work analyses the sinkhole field developed in the Sant Miquel de Campmajor Valley (SMCV), a discharge area of the aquifer, where a cartographic inventory including 94 sinkholes has been produced. Sinkholes in this hypogene gypsum karst are mainly large caprock-collapse sinkholes rooted in deep-seated cavities generated by interstratal hypogene karstification, as corroborated by an electrical resistivity imaging (ERI) survey. They show a non-clustered distribution within the sinkhole field and the variations in size and density across the area are mainly controlled by the thickness of the marl caprock. The magnitude and frequency relationships of the sinkholes can be modelled with a high goodness of fit with a log-normal function, like in other regions of the world. However, in this deep-seated hypogene system the depressions show much larger dimensions. Potential differences between the sinkholes developed in hypogene and epigene karst environments are discussed, including their distribution with respect to the groundwater flow system, their spatial patterns and dimensions.

Idioma: Inglés

DOI: 10.1016/j.geomorph.2018.12.003

Año: 2019

Publicado en: GEOMORPHOLOGY 328 (2019), 57-78
ISSN: 0169-555X

Factor impacto JCR: 3.819 (2019)

Categ. JCR: GEOGRAPHY, PHYSICAL rank: 9 / 50 = 0.18 (2019) - Q1 - T1
Categ. JCR: GEOSCIENCES, MULTIDISCIPLINARY rank: 28 / 198 = 0.141 (2019) - Q1 - T1

Factor impacto SCIMAGO: 1.384 - Earth-Surface Processes (Q1)

Financiación: info:eu-repo/grantAgreement/ES/DGA/C237-2016
Financiación: info:eu-repo/grantAgreement/ES/MINECO/BES-2014-068836
Financiación: info:eu-repo/grantAgreement/ES/MINECO/CGL2017-85045-P

Tipo y forma: Article (PostPrint)

Área (Departamento): Área Geodinámica Externa (Dpto. Ciencias de la Tierra)