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Resumen: This paper explores the use of trenching and paleoseismological techniques to determine salt flow rates into a salt diapir for the first time in the literature. The Salinas de Oro diapir, located in the northern Spanish Pyrenees, is an oval-shaped Triassic-salt stock that extends vertically for >>7 km down to the Paleozoic basement. Salt dissolution subsidence and diapir growth are coeval active processes. Karstification is responsible for the development of large sinkholes, a thick caprock and the monocline folding and ring faulting of the Cretaceous and Early Tertiary limestone rim. The evaporite karstic aquifer discharges high-concentration water of up to 137 g/l of total dissolved solids and a conductivity over 200 mS/cm into the Salado Creek, which drains the diapir top. The salinity monitoring of this drainage provides a maximum karstic surface lowering rate of around 2.8 mm/yr. Salt upwelling has caused the 150 m uplift of the annular limestone escarpment and the development of >>3000 m long radial grabens with up to 90 m of vertical offset that disrupt drainages, displace Quaternary deposits and overprint concentric faults. The 260 cm drag folding of lacustrine facies exposed in a 42 m long and 6.5 m deep trench due to the creep motion of the western radial fault of Azanza Graben yielded a minimum short-term uplift slip rate of 1.75 mm/yr for the last 1485 years and provides a minimum salt supply rate of over 5 mm/yr considering karstification lowering. This value that is several hundred times higher than average, evidence the discontinuous growth of Salinas de Oro diapir.
Idioma: Inglés
DOI: 10.1016/j.geomorph.2019.06.018
Año: 2019
Publicado en: GEOMORPHOLOGY 342 (2019), 210-222
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/MINECO/CGL2017-85045-P
Tipo y forma: Article (PostPrint)
Área (Departamento): Área Geodinámica Externa (Dpto. Ciencias de la Tierra)

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Articles > Artículos por área > Geodinámica Externa

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