Significance of the depth-related transition montmorillonite-beidellite in the Bouillante geothermal field (Guadeloupe, Lesser Antilles)

Guisseau, Delphine; Mas, Patricia Patrier; Beaufort, Daniel; Girard, Jean Pierre; Inoue, Atsuyuki; Sanjuan, Bernard; Petit, Sabine; Lens, Arnaud; Genter, Albert

doi:10.1515/energyo.0002.00002

Cited by 3 publications

(3 citation statements)

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“…The smectites mainly have a montmorillonitic composition (Figs 5 and 8; Table 3), typical of smectites associated with the early alteration products of volcanic glass (e.g. Bauluz et al, 2002;Guisseau et al, 2007), although some intermediate compositions between montmorillonite and beidellite cannot be ruled out, as is also suggested by XRD analyses (Figs 5, 8). Discrete smectite disappears completely at depths below 345 m, being replaced by I-S.…”

Section: Distribution Of Secondary Minerals and Compositional Evolutimentioning

confidence: 78%

Clay mineral associations in the clay cap from the Cerro Pabellón blind geothermal system, Andean Cordillera, Northern Chile

et al. 2018

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The occurrence of smectite-illite and smectite-chlorite minerals series was studied along a thick clay cap (~300 m) drilled in the Cerro Pabellón geothermal field (northern Andes, Chile). X-ray diffraction (XRD) and scanning electronic microscopy (SEM) were used to characterize the alteration mineralogy and clay mineral assemblages and their changes with depth. Cerro Pabellón is a high-enthalpy blind geothermal system, with a reservoir zone from ~500 m to 2000 m depth, with temperatures of 200–250°C. Three main hydrothermal alteration zones were identified: (1) argillic; (2) sub-propylitic, and (3) propylitic, with variable amounts of smectite, illite-smectite, chlorite-smectite, mixed-layer chlorite-corrensite, illite and chlorite appearing in the groundmass and filling amygdales and veinlets. Chemical and XRD data of smectites, I-S and illites show, with some exceptions, a progressive illitization with depth. The evolution of I-S with depth, shows a sigmoidal variation in the percentage of illite layers, with the conversion of smectite to R1 I-S at ~180–185°C. These temperatures are greater than those reported for other similar geothermal fields and might indicate, at least in part, the efficiency of the clay cap in terms of restricting the circulation of hydrothermal fluids in low-permeability rocks. Our results highlight the importance of a better understanding of clay-mineral evolution in active geothermal systems, not only as a direct (or indirect) way to control temperature evolution, but also as a control on permeability/porosity efficiency of the clay cap.

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Section: Distribution Of Secondary Minerals and Compositional Evolutimentioning

confidence: 78%

Clay mineral associations in the clay cap from the Cerro Pabellón blind geothermal system, Andean Cordillera, Northern Chile

et al. 2018

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“…These clay minerals could be formed through burial diagenesis in the transition from montmorillonite to beidellite that occurs during the initial phase of illitization. Continued diagenesis can form chlorite 91 or muscovite 92 . This clay transformation is supported by laboratory experiments where montmorillonite was converted to beidellite and illite over the temperature range 100-200°C 93 .…”

Section: Estimating Phyllosilicate Formation Rates On Marsmentioning

confidence: 99%

Surface clay formation during short-term warmer and wetter conditions on a largely cold ancient Mars

et al. 2018

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“…Clay minerals are abundant in regolith and sedimentary rocks [1,2]. Understanding the electrochemical properties of clays is relevant in environmental geoscience, geotechnics, geothermy, and gas and petroleum exploration [3][4][5][6][7]. Among clays, montmorillonite (Mt) is an important subgroup of smectite [8,9].…”

Section: Introductionmentioning

confidence: 99%

Spectral induced polarization of Na-montmorillonite dispersions

Leroy

Weigand

Mériguet

et al. 2017

Journal of Colloid and Interface Science

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Montmorillonite (Mt) clays have a high specific surface area and surface charge, which confer them remarkable adsorption properties. Nevertheless, their electrochemical and aggregation behavior are not completely elucidated because of the complexity of their microstructural and interfacial properties. In this work, the conductive and dispersive properties of Na-Mt suspensions of weight fractions 0.5-5.2% were investigated for the first time using the spectral induced polarization method. A four-electrode system was used to reduce errors introduced by electrode polarization and contact resistances. Complex conductivity spectra in the low-frequency range of 0.1Hz to 45kHz were successfully described using a triple layer model of the basal surface of Mt and a complex conductivity model that considers conduction of the diffuse layer and polarization of the Stern layer. Aggregate size distributions were inferred from inverted relaxation time distributions. We found that the negative and permanent surface charge of the basal plane of Na-Mt controls its quadrature (imaginary) conductivity, which is not very sensitive to pH and salinity (NaCl) in the 100Hz to 45kHz frequency range. For lower frequencies, the sudden increase of the quadrature conductivity at the highest salinities was explained by considering coagulation of Na-Mt particles.

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Significance of the depth-related transition montmorillonite-beidellite in the Bouillante geothermal field (Guadeloupe, Lesser Antilles)

Cited by 3 publications

References 0 publications

Clay mineral associations in the clay cap from the Cerro Pabellón blind geothermal system, Andean Cordillera, Northern Chile

Clay mineral associations in the clay cap from the Cerro Pabellón blind geothermal system, Andean Cordillera, Northern Chile

Surface clay formation during short-term warmer and wetter conditions on a largely cold ancient Mars

Spectral induced polarization of Na-montmorillonite dispersions

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