Hydrothermal alteration of olivine in a flow-through autoclave: Nucleation and growth of serpentine phases

Normand, Charles; Williams‐Jones, Anthony E.; Martin, Robert F.; Vali, Hojatollah

doi:10.2138/am-2002-11-1220

Cited by 52 publications

(32 citation statements)

References 9 publications

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“…Previous studies suggested that lizardite crystallized at lower levels of supersaturation than chrysotile e.g. [44]. Here, we confirm that high alkaline pH favors chrysotile precipitation [40,42].…”

Section: Serpentinization Reaction Under Alkaline Conditionssupporting

confidence: 87%

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Mineral replacement rate of olivine by chrysotile and brucite under high alkaline conditions

Lafay

Montes-Hernandez

Janots

et al. 2012

Journal of Crystal Growth

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International audienceOlivine mineral replacement by serpentine is one major alteration reaction of oceanic hydrothermalism. In the present experimental study, olivine grains were replaced by chrysotile and brucite under high alkaline conditions. In our study, olivine replacement implied a spatial and temporal coupling of dissolution and precipitation reactions at the interface between olivine and chrysotile-brucite minerals. Coupled dissolution-precipitation led to the alteration of starting olivine grains (so-called primary or parent mineral) to a porous mineral assemblage of chrysotile and brucite with preservation of the initial olivine morphology. This mineral replacement reaction of olivine (serpentinization) has been characterized using XRD, FESEM and FTIR measurements. Moreover, a simple and novel method is here proposed to quantify the mineral replacement rate (or serpentinization rate) of olivine by using thermogravimetric (TG) and differential TG (DTG) analyses. Serpentinization extent depends on the grain size: it is complete after 30 days of reaction for the smallest olivine grains (<30µm), after 90 days of reaction for the intermediate olivine grains (30 µm-56 µm) and reaches 55% of olivine replacement after 90 days for the largest fraction (56-150 µm). Based on the fitting of the serpentinization extent (t) versus time (t) by using a kinetic pseudo-second-order model, the serpentinization rates vary from 3.6x10-6 s-1 to 1.4x10-7 s-1 depending on the olivine grain size. An additional correlation between FTIR spectra analysis and TG measurements is proposed. The mineral replacement reactions frequently observed in natural alteration processes could be a powerful synthesis route to design new porous and/or nanostructured materials

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Section: Serpentinization Reaction Under Alkaline Conditionssupporting

confidence: 87%

“…6b and c). This micro-fracturing network might start following ordered families of fine-scale fractures from olivine grains [44]. In the oceanic crust, the micro-fracturing may be attributed to the stress generated by the volume increase during olivine serpentinization [28].…”

Section: Serpentinization Steps and Reaction Mechanismmentioning

confidence: 99%

Mineral replacement rate of olivine by chrysotile and brucite under high alkaline conditions

Lafay

Montes-Hernandez

Janots

et al. 2012

Journal of Crystal Growth

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show abstract

“…These results accord with Normand et al (2002) as well as with our observations (Fig. 2), which show that the central part of serpentine veins in Hyblean peridotites consist of lizardite, and their outer portion of chrysotile.…”

Section: Formation Of Serpentine Veinssupporting

confidence: 93%

Metasomatizing effects of serpentinization-related hydrothermal fluids in abyssal peridotites: new contributions from Hyblean peridotite xenoliths (southeastern Sicily)

Manuella¹,

Ottolini

Carbone

et al. 2016

Lithos

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“…Fluids that hydrate peridotites become alkaline as the hydration reaction proceeds (e.g., Normand et al, 2002), and alkaline solutions, with pH Ͼ11, are common in association with the hydration of ultramafic rocks (e.g., Barnes and O'Neil, 1969;Bruni et al, 2002;Kelley et al, 2005). This evidence suggests that As(V) released from sediments and slabs is likely stable in such highly alkaline conditions during the serpentinization of peridotites.…”

Section: Transfer Of Arsenic From Slabs To Mantle Wedgementioning

confidence: 99%

Occurrence of arsenic (V) in forearc mantle serpentinites based on X-ray absorption spectroscopy study

Hattori¹,

Takahashi²,

Guillot³

et al. 2005

Geochimica et Cosmochimica Acta

102

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Hydrothermal alteration of olivine in a flow-through autoclave: Nucleation and growth of serpentine phases

Cited by 52 publications

References 9 publications

Mineral replacement rate of olivine by chrysotile and brucite under high alkaline conditions

Mineral replacement rate of olivine by chrysotile and brucite under high alkaline conditions

Metasomatizing effects of serpentinization-related hydrothermal fluids in abyssal peridotites: new contributions from Hyblean peridotite xenoliths (southeastern Sicily)

Occurrence of arsenic (V) in forearc mantle serpentinites based on X-ray absorption spectroscopy study

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