An EFTEM/HRTEM high-resolution study of the near surface of labradorite feldspar altered at acid pH: evidence for interfacial dissolution-reprecipitation

Hellmann, Roland; Pénisson, J.M.; Hervig, R. L.; Thomassin, J M; Abrioux, M. F.

doi:10.1007/s00269-003-0308-4

Cited by 177 publications

(146 citation statements)

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“…Jump ratios were used because of the increased elemental sensitivity over the more quantitative three window elemental maps and because of the difficulty in obtaining a reliable Si L 2,3 -edge three window map due to the presence of the Al L 2,3 -edge in the Si L 2,3 -pre-edge region (three window maps needing more space in the pre-edge region for two windows, to accurately measure the background contribution underneath the edge) (Brydson, 2001). Once the images were collected, compositional gradients were measured using the technique outlined by Hellmann et al (2003). In our case intensity profiles were taken across the image of the interface, integrated over 300 pixels along the interface, using Digital Micrograph software and the width of the compositional gradient was measured between the two intensity plateaus in the profiles (insets in Figure 6).…”

Section: The Cell-mineral Interfacementioning

confidence: 99%

Investigating the role of microbes in mineral weathering: Nanometre-scale characterisation of the cell–mineral interface using FIB and TEM

Ward

Kapitulčinová

Brown

et al. 2013

Micron

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Focused ion beam (FIB) sample preparation in combination with subsequent transmission electron microscopy (TEM) analysis are powerful tools for nanometre-scale examination of the cell-mineral interface in bio-geological samples. In this study, we used FIB-TEM to investigate the interaction between a cyanobacterium (Hassallia byssoidea) and a common sheet silicate mineral (biotite) following a laboratory-based bioweathering, incubation experiment. We discuss the FIB preparation of cross-sections of the cell mineral interface for TEM investigation. We also establish an electron fluence threshold in biotite for the transition from scanning (S)TEM electron beam induced contamination build up on the surface of biotite thin sections to mass loss, or hole-drilling within the sections. Working below this threshold fluence nanometre-scale structural and elemental information has been obtained from biotite directly underneath cyanobacterial cells incubated on the biotite for three months. No physical alteration of the biotite was detected by TEM imaging and diffraction with little or no elemental alteration detected by STEM energy dispersive X-ray (EDX) elemental line scanning nor by energy filtered TEM (EF-TEM) jump ratio elemental mapping. As such we present evidence that the cyanobacterial strain of Hassallia byssoidea did not cause any measurable alteration of biotite, within the resolution limits of the analysis techniques used, after three months of incubation on its surface.

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Section: The Cell-mineral Interfacementioning

confidence: 99%

Investigating the role of microbes in mineral weathering: Nanometre-scale characterisation of the cell–mineral interface using FIB and TEM

Ward

Kapitulčinová

Brown

et al. 2013

Micron

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“…indistinct in PS1 and distinct in Liz3 2H1 . Further study is required to determine the presence of nano-scale layers in the remaining samples, as previously observed by others on single crystals of albite, labradorite, or wollastonite [Hellmann et al, 1990;Hellmann et al, 2003, RuizAgudo et al, 2012; as well as to investigate the incipient layers formation at a shorter leaching time. Figure 10 shows a schematic representation of a conceptual model for the siliceous layer formation through 2H + → Mg 2+ exchange, based on microanalysis of the two samples.…”

Section: Effect Of Rock Microtexture On Tens Of Microns Thick Silicementioning

confidence: 99%

“…It is considered that leached layers might form through: (i) incongruent dissolution and exchange of cations in the outermost zone of a mineral with hydrogen from solution, leading to preferential removal of cations showing weaker bonding with oxygen [Weissbart and Rimstidt, 2000;Schott et al, 2012]; and/or (ii) interface coupled dissolution/precipitation, with bond-breaking, elemental release and re-precipitation at the advancing fluid-mineral interface [Hellmann et al, 2003;Putnis, 2009;Ruiz-Agudo et al, 2012]. Although, the siliceous layers observed in this study are not sensu stricto leached layers, i.e.…”

Section: Liz3 2h1mentioning

confidence: 99%

“…This textural duality 43 was enhanced during prolonged acid-leaching, with greater Mg-extraction being observed from the 44 serpentine-like material. The other lizardite 2H 1 sample (Liz3) was more-homogeneous texturally 45 and generally less-crystalline than Liz2, as indicated by peak broadening in the associated XRD 46 pattern in contrast to the sharp diffraction peaks for Liz2 2H1 (Lacinska, PhD thesis concentric Mg-depletion and siliceous layer formation, commonly termed leached layers [Hellmann 49 et al, 1990;Hellmann et al, 2003;Teir et al, 2007;Weissbart and Rimstidt, 2000 and references 50 therein]. SEM-EDS data demonstrated that the amount of Mg within the Liz3 2H1 core material was 51 similar to that in the starting material, i.e.…”

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confidence: 99%

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Acid-dissolution of antigorite, chrysotile and lizardite for ex situ carbon capture and storage by mineralisation

et al. 2016

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Serpentine minerals serve as a Mg donor in carbon capture and storage by mineralisation (CCSM).The acid-treatment of nine comprehensively-examined serpentine polymorphs and polytypes, and the subsequent microanalysis of their post-test residues highlighted several aspects of great importance to the choice of the optimal feed material for CCSM. Compelling evidence for the nonuniformity of serpentine mineral performance was revealed, and the following order of increasing Mg extraction efficiency after three hours of acid-leaching was established: Al-bearing polygonal serpentine (<5%) ≤ Al-bearing lizardite 1T (≈5%) < antigorite (24-29%) < well-ordered lizardite 2H 1 (≈65%) ≤ Al-poor lizardite 1T (≈68%) < chrysotile (≈70%) < poorly-ordered lizardite 2H 1 (≈80%) < nanotubular chrysotile (≈85%).It was recognised that the Mg extraction efficiency of the minerals depended greatly on the intrinsic properties of crystal structure, chemistry and rock microtexture. On this basis, antigorite and Albearing well-ordered lizardite were rejected as potential feedstock material whereas any chrysotile, non-aluminous, widely spaced lizardite and/or disordered serpentine were recommended.The formation of peripheral siliceous layers, tens of microns thick, was not universal and depended greatly upon the intrinsic microtexture of the leached particles. This study provides the first comprehensive investigation of nine, carefully-selected serpentine minerals, covering most varieties and polytypes, under the same experimental conditions. We focused on material characterisation and the identification of the intrinsic properties of the minerals that affect particle's reactivity. It can therefore serve as a generic basis for any acid-based CCSM pre-treatment.

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“…These theoretical results can partially explain why the dissolution rates of plagioclase feldspar increases with the Al/Si ratio, and why preferential leaching of Al occurs more readily at high Al/Si ratio. However, alteration layers on feldspars such as labradorite (Al/Si = 0.66-0.8) have also been attributed to solution-reprecipitation (Hellmann et al 2003).…”

Section: Determination Of Reaction Mechanismsmentioning

confidence: 99%

Nuclear Energy Advanced Modeling and Simulation (NEAMS) Waste Integrated Performance and Safety Codes (IPSC) : FY10 development and integration.

Criscenti¹,

Sassani²,

Argüello³

et al. 2011

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This report describes the progress in fiscal year 2010 in developing the Waste Integrated Performance and Safety Codes (IPSC) in support of the U.S. Department of Energy (DOE) Office of Nuclear Energy Advanced Modeling and Simulation (NEAMS) Campaign. The goal of the Waste IPSC is to develop an integrated suite of computational modeling and simulation capabilities to quantitatively assess the long-term performance of waste forms in the engineered and geologic environments of a radioactive waste storage or disposal system. The Waste IPSC will provide this simulation capability (1) for a range of disposal concepts, waste form types, engineered repository designs, and geologic settings, (2) for a range of time scales and distances, (3) with appropriate consideration of the inherent uncertainties, and (4) in accordance with robust verification, validation, and software quality requirements.Waste IPSC activities in fiscal year 2010 focused on specifying a challenge problem to demonstrate proof of concept, developing a verification and validation plan, and performing an initial gap analyses to identify candidate codes and tools to support the development and integration of the Waste IPSC. The current Waste IPSC strategy is to acquire and integrate the necessary Waste IPSC capabilities wherever feasible, and develop only those capabilities that cannot be acquired or suitably integrated, verified, or validated. This year-end progress report documents the FY10 status of acquisition, development, and integration of thermal-hydrologicchemical-mechanical (THCM) code capabilities, frameworks, and enabling tools and infrastructure.iv ACKNOWLEDGEMENTS

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An EFTEM/HRTEM high-resolution study of the near surface of labradorite feldspar altered at acid pH: evidence for interfacial dissolution-reprecipitation

Cited by 177 publications

References 34 publications

Investigating the role of microbes in mineral weathering: Nanometre-scale characterisation of the cell–mineral interface using FIB and TEM

Investigating the role of microbes in mineral weathering: Nanometre-scale characterisation of the cell–mineral interface using FIB and TEM

Acid-dissolution of antigorite, chrysotile and lizardite for ex situ carbon capture and storage by mineralisation

Nuclear Energy Advanced Modeling and Simulation (NEAMS) Waste Integrated Performance and Safety Codes (IPSC) : FY10 development and integration.

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