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Timescales of spherulite crystallisation in obsidian inferred from water concentration profiles

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Timescales of spherulite crystallisation in obsidian inferred from water concentration profiles. / Castro, Jonathan M.; Beck, Pierre; Tuffen, Hugh et al.
In: American Mineralogist, Vol. 93, No. 11-12, 12.2008, p. 1816-1822.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Harvard

Castro, JM, Beck, P, Tuffen, H, Nichols, ARL, Dingwell, DB & Martin, MC 2008, 'Timescales of spherulite crystallisation in obsidian inferred from water concentration profiles', American Mineralogist, vol. 93, no. 11-12, pp. 1816-1822. https://doi.org/10.2138/am.2008.2904

APA

Castro, J. M., Beck, P., Tuffen, H., Nichols, A. R. L., Dingwell, D. B., & Martin, M. C. (2008). Timescales of spherulite crystallisation in obsidian inferred from water concentration profiles. American Mineralogist, 93(11-12), 1816-1822. https://doi.org/10.2138/am.2008.2904

Vancouver

Castro JM, Beck P, Tuffen H, Nichols ARL, Dingwell DB, Martin MC. Timescales of spherulite crystallisation in obsidian inferred from water concentration profiles. American Mineralogist. 2008 Dec;93(11-12):1816-1822. doi: 10.2138/am.2008.2904

Author

Castro, Jonathan M. ; Beck, Pierre ; Tuffen, Hugh et al. / Timescales of spherulite crystallisation in obsidian inferred from water concentration profiles. In: American Mineralogist. 2008 ; Vol. 93, No. 11-12. pp. 1816-1822.

Bibtex

@article{93761bf6acad483f8415982ca92ea6ef,
title = "Timescales of spherulite crystallisation in obsidian inferred from water concentration profiles",
abstract = "We determined the kinetics of spherulite growth in obsidians from Krafla volcano, Iceland. We measured water concentration profiles around spherulites in obsidian by synchrotron Fourier transform infrared spectroscopy. The distribution of OH– groups surrounding spherulites decreases exponentially away from the spherulite-glass border, reflecting expulsion of water during crystallization of an anhydrous paragenesis (plagioclase + SiO2 + clinopyroxene + magnetite). This pattern is controlled by a balance between the growth rate of the spherulites and the diffusivity of hydrous solute in the rhyolitic melt. We modeled advective and diffusive transport of the water away from the growing spherulites by numerically solving the diffusion equation with a moving boundary. Numerical models fit the natural data best when a small amount of post-growth diffusion is incorporated in the model. Comparisons between models and data constrain the average spherulite growth rates for different temperatures and highlight size-dependent growth among a small population of spherulites.",
keywords = "Spherulite, diffusion, obsidian, crystallization",
author = "Castro, {Jonathan M.} and Pierre Beck and Hugh Tuffen and Nichols, {Alexander R. L.} and Dingwell, {Douglas B.} and Martin, {Michael C.}",
year = "2008",
month = dec,
doi = "10.2138/am.2008.2904",
language = "English",
volume = "93",
pages = "1816--1822",
journal = "American Mineralogist",
issn = "0003-004X",
publisher = "De Gruyter",
number = "11-12",

}

RIS

TY - JOUR

T1 - Timescales of spherulite crystallisation in obsidian inferred from water concentration profiles

AU - Castro, Jonathan M.

AU - Beck, Pierre

AU - Tuffen, Hugh

AU - Nichols, Alexander R. L.

AU - Dingwell, Douglas B.

AU - Martin, Michael C.

PY - 2008/12

Y1 - 2008/12

N2 - We determined the kinetics of spherulite growth in obsidians from Krafla volcano, Iceland. We measured water concentration profiles around spherulites in obsidian by synchrotron Fourier transform infrared spectroscopy. The distribution of OH– groups surrounding spherulites decreases exponentially away from the spherulite-glass border, reflecting expulsion of water during crystallization of an anhydrous paragenesis (plagioclase + SiO2 + clinopyroxene + magnetite). This pattern is controlled by a balance between the growth rate of the spherulites and the diffusivity of hydrous solute in the rhyolitic melt. We modeled advective and diffusive transport of the water away from the growing spherulites by numerically solving the diffusion equation with a moving boundary. Numerical models fit the natural data best when a small amount of post-growth diffusion is incorporated in the model. Comparisons between models and data constrain the average spherulite growth rates for different temperatures and highlight size-dependent growth among a small population of spherulites.

AB - We determined the kinetics of spherulite growth in obsidians from Krafla volcano, Iceland. We measured water concentration profiles around spherulites in obsidian by synchrotron Fourier transform infrared spectroscopy. The distribution of OH– groups surrounding spherulites decreases exponentially away from the spherulite-glass border, reflecting expulsion of water during crystallization of an anhydrous paragenesis (plagioclase + SiO2 + clinopyroxene + magnetite). This pattern is controlled by a balance between the growth rate of the spherulites and the diffusivity of hydrous solute in the rhyolitic melt. We modeled advective and diffusive transport of the water away from the growing spherulites by numerically solving the diffusion equation with a moving boundary. Numerical models fit the natural data best when a small amount of post-growth diffusion is incorporated in the model. Comparisons between models and data constrain the average spherulite growth rates for different temperatures and highlight size-dependent growth among a small population of spherulites.

KW - Spherulite

KW - diffusion

KW - obsidian

KW - crystallization

UR - http://www.scopus.com/inward/record.url?scp=57849128149&partnerID=8YFLogxK

U2 - 10.2138/am.2008.2904

DO - 10.2138/am.2008.2904

M3 - Journal article

VL - 93

SP - 1816

EP - 1822

JO - American Mineralogist

JF - American Mineralogist

SN - 0003-004X

IS - 11-12

ER -