Evidence of phyllosilicate alteration processes and clay mineral neoformation promoted by hydrothermal fluids in the Padul Fault area (Betic Cordillera, SE Spain)

Abad, Isabel; Nieto, Fernando; Reolid, Matías; Jiménez-Millán, Juan

doi:10.1016/j.clay.2022.106669

Cited by 7 publications

(2 citation statements)

References 46 publications

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“…Clay minerals can replace previous minerals or can be formed by direct precipitation from fluids circulating in the area [52,53]. The concentration and circulation of fluids in the microstructures of fault rocks, even under very low temperatures, can promote the neoformation of clays by processes of structural diagenesis [7,54]. In the study zone, the As, Be, Si, Mg, and B groundwater enrichment in certain samples (thermal Acra well (14), Gurullas well (16) and Larva well I ( 17)), as well as the high temperature of the groundwater discharged from these wells, can be related to the presence of smectitic minerals as a typical pattern of changes produced by fluidrock low-temperature interaction with the subsequent precipitation of authigenic minerals.…”

Section: Mineral and Petrographic Characterization Of The Fault Rocksmentioning

confidence: 99%

“…The flow of fluids controlled by tectonics can produce high-salinity microenvironments facilitating changes in the mica octahedral layer charge that favor its transformation and the neoformation of clay minerals [59][60][61]. Abad et al [54] described smectite neoformation during a low-temperature stage in the Padul fault.…”

Section: Mineral and Petrographic Characterization Of The Fault Rocksmentioning

confidence: 99%

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Water–Rock Interaction Processes in Tíscar and Larva Active Faults (Betic Cordillera, SE Spain)

Jiménez-Espinosa,

Hernández-Puentes,

Jiménez-Millán

2024

Water

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A hydrochemical and mineral study of groundwaters and damaged rocks from the Tíscar and Larva fault zones (Betic Cordillera, Iberian Peninsula) was carried out in order to (a) describe the physical and chemical properties of the groundwaters; (b) recognize significant locations with deep-origin fluids related to active tectonics; (c) and to describe the water–rock interaction and the neoformation of clay mineral processes and their importance in the seismicity of the faults. A sampling campaign was completed between November 2012 and November 2013, during which data were obtained from 23 different groundwater sites in the fault areas. Two main groups of waters were distinguished: (a) Ca2+-Mg2+-HCO3− facies characterized by poor conductivity and salinity; and (b) saline waters (up to 30 meq/L) rich in Ca2+-Mg2+-SO4-Cl− and with an elevated conductivity (frequently > 1000 μS/cm). In addition, a minor group of saline and warm waters (T > 16.5 °C) was found to be Na+-rich and show moderately high B values (>0.33 ppm), and which mig ht be hosted in aquifers deeper than the two main groups. This group of deep-origin waters is oversaturated in clay minerals and is in equilibrium for Ca-Mg carbonate minerals. X-ray diffraction and scanning and transmission electron microscopy data corroborate the crystallization forecast of authigenic smectite, which appears as thin films coating carbonate fragments. The origin of smectite is related to the fragile strain and thermal–fluid–mineral interactions in fault rocks. Smectite could lubricate carbonate rocks, which favor creep deformation versus seismic slip. This work provides locations where groundwater physico-chemical properties and composition suggest tectonic fault activity.

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Section: Mineral and Petrographic Characterization Of The Fault Rocksmentioning

confidence: 99%

Section: Mineral and Petrographic Characterization Of The Fault Rocksmentioning

confidence: 99%

Water–Rock Interaction Processes in Tíscar and Larva Active Faults (Betic Cordillera, SE Spain)

Jiménez-Espinosa,

Hernández-Puentes,

Jiménez-Millán

2024

Water

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Anomalous patterns of clay minerals in fault zones

XU,

YU,

LIN

et al. 2023

Engineering Geology

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Decarbonation generates considerable CO2 in sedimentary basin environments: implications for the formation of secondary pores

Song,

Wang,

et al. 2024

Marine and Petroleum Geology

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Evidence of phyllosilicate alteration processes and clay mineral neoformation promoted by hydrothermal fluids in the Padul Fault area (Betic Cordillera, SE Spain)

Cited by 7 publications

References 46 publications

Water–Rock Interaction Processes in Tíscar and Larva Active Faults (Betic Cordillera, SE Spain)

Water–Rock Interaction Processes in Tíscar and Larva Active Faults (Betic Cordillera, SE Spain)

Anomalous patterns of clay minerals in fault zones

Decarbonation generates considerable CO2 in sedimentary basin environments: implications for the formation of secondary pores

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