Kinetics and Mechanisms of Dehydration and Recrystallization of Serpentine—I

Brindley, G. W.

doi:10.1346/ccmn.1963.0120107

Cited by 29 publications

(25 citation statements)

References 13 publications

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“…Brindley and Hayami 1963). Comparison of the CI-like chondrites with mineral textures in artificially heated Murchison CM chondrite suggests that the metamorphism of Y-82162 and Y-980115 occurred over hours to several years (Nakato et al 2008).…”

Section: Thermal Metamorphism Of Ci-like Chondritesmentioning

confidence: 97%

Characterising the CI and CI-like carbonaceous chondrites using thermogravimetric analysis and infrared spectroscopy

et al. 2015

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The CI and CI-like chondrites provide a record of aqueous alteration in the early solar system. However, the CI-like chondrites differ in having also experienced a late stage period of thermal metamorphism. In order to constrain the nature and extent of the aqueous and thermal alteration, we have investigated the bulk mineralogy and abundance of H 2 O in the CI and CI-like chondrites using thermogravimetric analysis and infrared spectroscopy. The CI chondrites Ivuna and Orgueil show significant mass loss (28.5-31.8 wt.%) upon heating to 1000°C due to dehydration and dehydroxylation of abundant phyllosilicates and Fe-(oxy)hydroxides and the decomposition of Fe-sulphides, carbonates and organics. Infrared spectra for Ivuna and Orgueil have a prominent 3-μm feature due to bound −OH/H 2 O in phyllosilicates and Fe-(oxy)hydroxides and only a minor 11-μm feature from anhydrous silicates. These characteristics are consistent with previous studies indicating that the CI chondrites underwent near-complete aqueous alteration. Similarities in the total abundance of H 2 O and 3 μm/11 μm ratio suggest that there is no difference in the relative degree of hydration experienced by Ivuna and Orgueil. In contrast, the CI-like chondrites Y-82162 and Y-980115 show lower mass loss (13.8-18.8 wt.%) and contain >50 % less H 2 O than the CI chondrites. The 3-μm feature is almost absent from spectra of Y-82162 and Y-980115 but the 11-μm feature is intense. The CI-like chondrites experienced thermal metamorphism at temperatures >500°C that initially caused dehydration and dehydroxylation of phyllosilicates before partial recrystallization back into anhydrous silicates. The surfaces of many C-type asteroids were probably heated through impact metamorphism and/or solar radiation, so thermally altered carbonaceous chondrites are likely good analogues for samples that will be returned by the Hayabusa-2 and OSIRIS-REx missions.

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Section: Thermal Metamorphism Of Ci-like Chondritesmentioning

confidence: 97%

Characterising the CI and CI-like carbonaceous chondrites using thermogravimetric analysis and infrared spectroscopy

et al. 2015

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“…[55][56][57][58][59] The proposed mechanisms, as shown in Figure 3, are based on a topotactic transition whereby forsterite and enstatite form from the Mg-rich and Si-rich regions, respectively. Based on their NMR results, MacKenzie and Meinhold 58,60 ( Figure 3d) updated the mechanism of Brindley and Hayami 56 ( Figure 3b) …”

Section: Thermal Reaction Sequencementioning

confidence: 99%

Dehydroxylation of serpentine minerals: Implications for mineral carbonation

Dlugogorski

Balucan

2014

Renewable and Sustainable Energy Reviews

113

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This review examines studies on the dehydroxylation of serpentine minerals published in the open literature from 1945 to 2013, with brief description of earlier work.Presently, the energy cost and technological complications, required to amorphise serpentine minerals by dehydroxylation, prevent their large-scale application for sequestering of CO 2 . The focus of the review is on thermal dehydroxylation, although mechanical dehydroxylation by grinding and shock, as well as thermomechanical dehydroxylation are also covered. We discuss the chemical and physical transformations involving the proposed mechanisms, thermal stability, reaction kinetics, the formation of intermediates and products, associated heat requirements, factors that influence the reaction, as well as associated enhancements in both dissolution and carbonation. The primary factor controlling the availability of Mg for either extraction or carbonation is structural disorder. The review demonstrates that activation processes must avoid recrystallisation of disordered phases to fosterite and enstatite, and minimise the partial pressure of water vapour that engenders reverse reaction.

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“…The large jump in frequency of the A 1g mode of lizardite down to 183 cm -1 and the jump in frequency of the s Si-O b -Si band is assigned to product phase(s) of the dehydroxylation. Under ambient, dry conditions the first recognizable dehydroxylation product is mainly amorphous, but crystallizes upon further heating to forsterite, followed by enstatite (Brindley and Hayami 1963). The stable products of the dehydroxylation reaction of pure magnesian lizardite under hydrothermal conditions are talc, forsterite, and water (O'Hanley et al 1989).…”

Section: Dehydroxylation Products: a Talc-like Intermediate And Forstmentioning

confidence: 99%

“…Various authors (e.g., McKelvy et al 2004;Brindley and Zussman 1957) reported low-angle peaks in X-ray diffractograms of thermally treated serpentine phases, indicating that amorphization is not complete and that dehydroxylation produces intermediate partially ordered structures. Although differing in detail, early studies by Ball and Taylor (1963) and Brindley and Hayami (1965) proposed reaction sequences with disordered dehydroxylated intermediates. They infer the presence of a partially ordered structure from the topotactic relationship between forsterite and serpentine (Brindley and Hayami 1963).…”

Section: Dehydroxylation Products: a Talc-like Intermediate And Forstmentioning

confidence: 99%

“…Although differing in detail, early studies by Ball and Taylor (1963) and Brindley and Hayami (1965) proposed reaction sequences with disordered dehydroxylated intermediates. They infer the presence of a partially ordered structure from the topotactic relationship between forsterite and serpentine (Brindley and Hayami 1963). Based on a peak corresponding to a d-spacing of 14 Å, McKelvy et al (2006) proposed the formation of a lamellar oxyhydroxide meta-serpentine characterized by a doubled cell dimension along the c axis and a heterogeneous OH distribution.…”

Section: Dehydroxylation Products: a Talc-like Intermediate And Forstmentioning

confidence: 99%

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In situ high-temperature Raman and FTIR spectroscopy of the phase transformation of lizardite

Trittschack¹,

Grobéty²,

Koch‐Müller³

2012

American Mineralogist

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A temperature-dependent in situ micro-FTIR and micro-Raman spectroscopic investigation was performed on powdered (FTIR, Raman) and single-crystal (Raman) lizardite-1T samples between room temperature and 819 °C. Between room temperature and 665 °C, the OH stretching bands shift to lower wavenumbers, demonstrating a weak expansion of the O3-H3 … O2 interlayer distance. Band deconvolution of FTIR and Raman spectra at room temperature show differences in the number of bands in the OH stretching region with respect to group theory: four (FTIR) and six (Raman) OH stretching bands, respectively. This number reduces to four (Raman) at non-ambient temperatures either caused by LO-TO splitting, the presence of non-structural OH species or the presence of different lizardite polytypes and/or serpentine polymorphs as well as defects. During dehydroxylation, the evolution of the integrated intensity of the OH bands suggests a transport of hydrogen and oxygen as individual ions/molecule or OH -. A significant change in Raman spectra occurs between 639 and 665 °C with most lizardite peaks disappearing contemporaneously with the appearance of forsterite-related features and new, non-forsterite bands at 183, 350, and 670 cm -1 . A further band appears at 1000 cm -1 at 690 °C. The long stability of Si-O-related bands indicates a delayed decomposition of the tetrahedral sheet with respect to the dehydroxylation of the octahedral sheet. Moreover, evidence for a small change in the ditrigonal distortion angle during heating is given. In general, all appearing non-forsterite-related frequencies are similar to Raman data of talc and this indicates the presence of a talc-like intermediate.

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Kinetics and Mechanisms of Dehydration and Recrystallization of Serpentine—I

Cited by 29 publications

References 13 publications

Characterising the CI and CI-like carbonaceous chondrites using thermogravimetric analysis and infrared spectroscopy

Characterising the CI and CI-like carbonaceous chondrites using thermogravimetric analysis and infrared spectroscopy

Dehydroxylation of serpentine minerals: Implications for mineral carbonation

In situ high-temperature Raman and FTIR spectroscopy of the phase transformation of lizardite

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