Nontronite dissolution rates and implications for Mars

Gainey, S. R.; Hausrath, Elisabeth M.; Hurowitz, J. A.; Milliken, R. E.

doi:10.1016/j.gca.2013.10.055

Cited by 31 publications

(30 citation statements)

References 92 publications

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“…If particles are nontronite, their dissolution would be lower than underlying zeolites and they will be mechanically removed by the AFM tip during the measurements. This process is also supported by literature results, reporting that under several pH conditions, the dissolution of zeolites compared to clay minerals and, in particular, to nontronite (one of the most stable clay minerals) is faster [82,83].…”

Section: Discussionsupporting

confidence: 81%

“…The cell parameters are a = 13.27-13.32 Å, c = 7.56-7.61 Å and the average chemical formula is KCaMg(Al 5 Si 13 O 36 )·15H 2 O [4,13]. Offretite typically occurs as fine microscopic crystals of hydrothermal origin clustered in vugs and veins of basic volcanic rocks, but it Minerals 2019, 9,83; doi:10.3390/min9020083 www.mdpi.com/journal/minerals Minerals 2019, 9,83 2 of 23 has also been found in cavities of arenaceous metasiltites or hornfels [14]. Along with commonly observed prismatic habit, asbestiform offretite has also been found [15].…”

Section: Introductionmentioning

confidence: 99%

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Real-Time Observation of Fibrous Zeolites Reactivity in Contact with Simulated Lung Fluids (SLFs) Obtained by Atomic Force Microscope (AFM)

et al. 2019

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Inhalation of fibrous erionite particles has been linked to malignant mesothelioma. Accordingly, erionite is considered the most carcinogenic mineral. The reactivity and the nature of erionite biotoxicity has been the subject of intensive research. Despite very close chemical and structural relationships between erionite and offretite, the reactivity of offretite in lung fluids remains unknown. In this paper, the interaction of erionite and offretite surfaces with simulated lung fluids was investigated by means of in situ atomic force microscope (AFM). To simulate different environments in the lungs, artificial lysosomal fluid (ALF) and Gamble's solution were used. In ALF (4.15 < pH < 4.31) the dissolution of erionite and offretite surfaces was detected, as well as an evident removal of particles (mainly attributed to impurities) from the crystal faces. Instead, the growth of a layer of a yet unknown phase on the surface of both zeolites was observed during the interaction with Gamble's solution (7.4 < pH < 8.48). The thickness of this layer reached a few tens of nanometers and covered all the observed areas. The understanding of the observed processes is of paramount importance, since they could be potentially involved in the mechanisms triggering the toxicological effects of erionite fibres.

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Section: Discussionsupporting

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Real-Time Observation of Fibrous Zeolites Reactivity in Contact with Simulated Lung Fluids (SLFs) Obtained by Atomic Force Microscope (AFM)

et al. 2019

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“…Formation of smectite, either during serpentinization or during very early weathering likely plays a stabilizing role during future weathering. Smectites such as montmorillonite and nontronite (Gainey et al, 2014), dissolve several orders of magnitude more slowly than serpentine minerals in laboratory experiments (Fig. 9), and their presence would therefore be likely to help stabilize rocks and soil.…”

Section: Discussionmentioning

confidence: 99%

Biogeochemical weathering of serpentinites: An examination of incipient dissolution affecting serpentine soil formation

Baumeister

Hausrath

Olsen

et al. 2015

Applied Geochemistry

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“…The m out was determined by plotting the concentration data as a function of time and averaging the concentrations of samples that represented a “steady state” period (Figure ). The steady state concentration consisted of an average of the final four samples, which varied less than 5% following previously developed criteria [ Gainey et al ., ]. Fe 3+ concentrations were divided by 3 to calculate mineral dissolution rates from iron release rates based on the initial jarosite stoichiometry.…”

Section: Discussionmentioning

confidence: 99%

Assessing hydrodynamic effects on jarosite dissolution rates, reaction products, and preservation on Mars

et al. 2015

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Jarosite flow-through dissolution experiments were conducted in ultrapure water (UPW), pH 2 sulfuric acid, and saturated NaCl and CaCl 2 brines at 295-298 K to investigate how hydrologic variables may affect jarosite preservation and reaction products on Mars. K + -based dissolution rates in flowing UPW did not vary significantly with flow rate, indicating that mineral surface reactions control dissolution rates over the range of flow rates investigated. In all of the solutions tested, hydrologic variables do not significantly affect extent of jarosite alteration; therefore, jarosite is equally likely to be preserved in flowing or stagnant waters on Mars. However, increasing flow rate did affect the mineralogy and accumulation of secondary reaction products. Iron release rates in dilute solutions increased as the flow rate increased, likely due to nanoscale iron (hydr)oxide transport in flowing water. Anhydrite formed in CaCl 2 brine flow-through experiments despite low temperatures, while metastable gypsum and bassanite were observed in batch experiments. Therefore, observations of the hydration state of calcium sulfate minerals on Mars may provide clues to unravel past salinity and hydrologic conditions as well as temperatures and vapor pressures.

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Nontronite dissolution rates and implications for Mars

Cited by 31 publications

References 92 publications

Real-Time Observation of Fibrous Zeolites Reactivity in Contact with Simulated Lung Fluids (SLFs) Obtained by Atomic Force Microscope (AFM)

Real-Time Observation of Fibrous Zeolites Reactivity in Contact with Simulated Lung Fluids (SLFs) Obtained by Atomic Force Microscope (AFM)

Biogeochemical weathering of serpentinites: An examination of incipient dissolution affecting serpentine soil formation

Assessing hydrodynamic effects on jarosite dissolution rates, reaction products, and preservation on Mars

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