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:10.2138/am.2007.2398

Cited by 27 publications

(8 citation statements)

References 45 publications

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“…The spectral signature is more consistent with the Al-smectite beidellite than montmorillonite. Beidellite typically forms at higher temperatures than montmorillonite or could be the result of hydrothermal alteration or burial diagenesis [e.g., Guisseau et al, 2007]. The band near 2.19 mm is broad which could be consistent with a mixture of some allophane as well; however, beidellite is more consistent with the observed spectral features.…”

Section: Detailed Spectral Analysesmentioning

confidence: 81%

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Mineralogy and morphology of geologic units at Libya Montes, Mars: Ancient aqueously derived outcrops, mafic flows, fluvial features, and impacts

et al. 2013

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[1] There is ample evidence of both ancient and long-lasting fluvial activity and chemical alteration in the Libya Montes region south of Isidis Basin. The region hosts Noachian to Amazonian aged surface rocks with extensive outcrops of olivine-and pyroxene-bearing material. Libya Montes also features surface outcrops and/or deposits hosting Fe/Mgsmectite, Fe/Mg-smectite mixed with carbonate and/or other Fe/Mg-rich phyllosilicates, and Al-smectite. These units likely formed through chemical alteration connected with hydrothermal activity resulting from the formation of the Isidis Basin and/or the pervasive fluvial activity throughout this region. The morphology and stratigraphy of the aqueous and mafic minerals are described using High Resolution Imaging Science Experiment and High Resolution Stereo Camera derived digital terrain models. Analyses of the Compact Reconnaissance Imaging Spectrometer for Mars spectra show variations in the chemistry of the Fe/Mg-smectite from nontronite-like exposures with spectral features near 2.29 and 2.4 mm more consistent with Fe 3+ 2 OH groups in the mineral structure, and saponite-like outcrops with spectral features near 2.31 and 2.38 mm characteristic of Mg 2+ 3 OH groups. These Fe/Mg-smectite bearing materials also have bands near 1.9 mm due to H 2 O and near 2.5 mm that could be due to the smectite, other phyllosilicates, and carbonates. All regions exhibiting carbonate features near 3.4-3.5 mm also have features consistent with the presence of olivine and Fe/Mg-smectite, indicating that the carbonate signatures occur in rocks likely containing a mixture of these minerals. The Al-smectite-bearing rocks have bands near 1.41, 1.91, and 2.19 mm that are more consistent with beidellite than other Al-phyllosilicates, indicating a higher-temperature or diagenetically processed origin for this material. Our interpretation of the geologic history of this region is that ancient Noachian basaltic crustal materials experienced extensive aqueous alteration at the time of the Isidis impact, during which the montes were also formed, followed by emplacement of a rough olivine-rich lava or melt, and finally the smooth pyroxene-bearing caprock unit.All Supporting Information may be found in the online version of this article.

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Section: Detailed Spectral Analysesmentioning

confidence: 81%

“…Unfortunately, these are too small and too few to determine if they are older or more recent than the olivine-rich unit. Beidellite forms at elevated temperatures compared to another Al-smectite montmorillonite, and beidellite is typically associated with hydrothermal processes or burial diagenesis [e.g., Guisseau et al, 2007].…”

Section: Discussionmentioning

confidence: 99%

Mineralogy and morphology of geologic units at Libya Montes, Mars: Ancient aqueously derived outcrops, mafic flows, fluvial features, and impacts

et al. 2013

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“…One sample taken from the greenish gray interval (Sample 42R-5, 67-68 cm) for XRD analysis contains >80% montmorillonitebeidellite ( Figure F13), which is of diagenetic origin (Larsen and Chilingar, 1979;Sato et al, 1996). The existence of beidellite also implies the sample may have undergone hydrothermal alteration (Guisseau et al, 2007).…”

Section: Diagenesismentioning

confidence: 99%

Site U1500

Stock¹,

Sun²,

Klaus³

et al. 2018

Proceedings of the International Ocean Discovery Program

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Background and objectives 11 Operations 15 Lithostratigraphy 25 Igneous and metamorphic petrology 32 Structural geology 37 Biostratigraphy 39 Paleomagnetism 44 Geochemistry 46 Physical properties 50 Downhole measurements 53 Correlation to seismic data 55 References J.M. Stock et al. Site U1500 IODP Proceedings 2 Volume 367/368 Table T1. Site U1500 core summary. * = base of 10.75 inch casing at 842 m; drilled in with pilot bit and underreamer that extended below the end of the casing. † = excludes core recovered during hole cleaning (ghost core). DRF = drilling depth below rig floor, DSF = drilling depth below seafloor. Core type: numeric core type = drilled interval, R = rotary core barrel, G = ghost core. WOB = weight on bit. Drilling break = fast penetration, unable to maintain any WOB. (Continued on next two pages.) Download table in CSV format.

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“…However, that process does lead to Al-smectites like kaolinite, for example, but not to beidellite which is the dominant Al-smectite at all detection sites (Ehlmann et al, 2008b). Hence, the beidellite is more likely to have formed from low temperature hydrothermal alteration (Grauby et al, 1993) or burial diagenesis of the bedrock materials at this site because beidellite forms at elevated temperatures compared to montmorillionite (Huertas, 2000;Guisseau et al, 2007;Bishop et al, 2011;Bishop et al, 2013b). However, formation of beidellite rather than illite or chlorite indicates that diagenesis progressed only partially (Robin et al, 2015).…”

Section: Aqueous Alteration Minerals At the Hashir Regionmentioning

confidence: 94%

“…These phyllosilicates could have formed in situ as montmorillonite and then later altered to beidellite through diagenesis following emplacement of the caprock. Another option is that beidellite formed directly in a pool of very warm water (possibly as high as 100°C) because beidellite forms at elevated temperatures (e.g., Guisseau et al, 2007;Bishop et al, 2011;Bishop et al, 2013b). opal and Ca-chlorides in nearby pools at this site could have begun with crystallization in a lacustrine, evaporative environment, followed by mild diagenesis.…”

Section: The Fan-deposit At Bradbury's Northern Crater Rimmentioning

confidence: 99%

Geology of central Libya Montes, Mars: Aqueous alteration history from mineralogical and morphological mapping

Tirsch

Bishop

Voigt

et al. 2018

Icarus

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We analyze the emplacement chronology and aqueous alteration history of distinctive mineral assemblages and related geomorphic units near Hashir and Bradbury impact craters located within the Libya Montes, which are part of the southern rim of the Isidis Basin on Mars. We derive our results from a spectro-morphological mapping project that combines spectral detections from CRISM near-infrared imagery with geomorphology and topography from HRSC, CTX, and HiRISE imagery. Through this combination of data sets, we were able to use the morphology associated with specific mineral detections to extrapolate the possible extent of the units hosting these compositions. We characterize multiple units consistent with formation through 2 volcanic, impact, hydrothermal, lacustrine and evaporative processes. Altered pyroxenebearing basement rocks are unconformably overlain by an olivine-rich unit, which is in turn covered by a pyroxene-bearing capping unit. Aqueously altered outcrops identified here include nontronite, saponite, beidellite, opal, and dolomite. The diversity of mineral assemblages suggests that the nature of aqueous alteration at Libya Montes varied in space and time. This mineralogy together with geologic features shows a transition from Noachian aged impact-induced hydrothermal alteration and the alteration of Noachian bedrock by neutral to slightly basic waters via Hesperian aged volcanic emplacements and evaporative processes in lacustrine environments followed by Amazonian resurfacing in the form of aeolian erosion.

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

Cited by 27 publications

References 45 publications

Mineralogy and morphology of geologic units at Libya Montes, Mars: Ancient aqueously derived outcrops, mafic flows, fluvial features, and impacts

Mineralogy and morphology of geologic units at Libya Montes, Mars: Ancient aqueously derived outcrops, mafic flows, fluvial features, and impacts

Site U1500

Geology of central Libya Montes, Mars: Aqueous alteration history from mineralogical and morphological mapping

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