In situ formation of coestite under hydrothermal conditions

M. C. Wilding; C. J. Ridley; C. L. Bull; J. B. Parise

doi:10.1080/08957959.2020.1830080

In situ formation of coestite under hydrothermal conditions

M. C. Wilding
, C. J. Ridley
, C. L. Bull
, J. B. Parise

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

We present the in situ neutron diffraction data of a water and silica mixture at high pressure and temperature. We show initially the formation of ice VI at 1.5 GPa at 290 K in the presence of crystalline SiO₂, upon heating we observe its melting at ∼400 K. Upon further warming to 1200 K, we observe melting of the crystalline silica. Upon cooling to 290 K and recovery to ambient pressure, we obtain a mixture of silica in the coesite structure and liquid water. These results have implications for the phase diagram of the coesite–water solidus and hence the behaviour of fluids at mantle conditions.

Original language	English
Pages (from-to)	478-487
Number of pages	10
Journal	High Pressure Research
Volume	40
Issue number	4
DOIs	https://doi.org/10.1080/08957959.2020.1830080
State	Published - Oct 1 2020
Externally published	Yes

Funding

The authors thank STFC for providing access to the PEARL instrument and facilities within ISIS. We thank Ron Smith of ISIS, STFC for help in obtaining the data on POLARIS.

Keywords

High pressure
fluid
mantle
melting
neutron diffraction

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10.1080/08957959.2020.1830080

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title = " In situ formation of coestite under hydrothermal conditions",

abstract = "We present the in situ neutron diffraction data of a water and silica mixture at high pressure and temperature. We show initially the formation of ice VI at 1.5 GPa at 290 K in the presence of crystalline SiO2, upon heating we observe its melting at ∼400 K. Upon further warming to 1200 K, we observe melting of the crystalline silica. Upon cooling to 290 K and recovery to ambient pressure, we obtain a mixture of silica in the coesite structure and liquid water. These results have implications for the phase diagram of the coesite–water solidus and hence the behaviour of fluids at mantle conditions.",

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T1 - In situ formation of coestite under hydrothermal conditions

AU - Wilding, M. C.

AU - Ridley, C. J.

AU - Bull, C. L.

AU - Parise, J. B.

PY - 2020/10/1

Y1 - 2020/10/1

N2 - We present the in situ neutron diffraction data of a water and silica mixture at high pressure and temperature. We show initially the formation of ice VI at 1.5 GPa at 290 K in the presence of crystalline SiO2, upon heating we observe its melting at ∼400 K. Upon further warming to 1200 K, we observe melting of the crystalline silica. Upon cooling to 290 K and recovery to ambient pressure, we obtain a mixture of silica in the coesite structure and liquid water. These results have implications for the phase diagram of the coesite–water solidus and hence the behaviour of fluids at mantle conditions.

AB - We present the in situ neutron diffraction data of a water and silica mixture at high pressure and temperature. We show initially the formation of ice VI at 1.5 GPa at 290 K in the presence of crystalline SiO2, upon heating we observe its melting at ∼400 K. Upon further warming to 1200 K, we observe melting of the crystalline silica. Upon cooling to 290 K and recovery to ambient pressure, we obtain a mixture of silica in the coesite structure and liquid water. These results have implications for the phase diagram of the coesite–water solidus and hence the behaviour of fluids at mantle conditions.

KW - High pressure

KW - fluid

KW - mantle

KW - melting

KW - neutron diffraction

UR - https://www.scopus.com/pages/publications/85092697331

U2 - 10.1080/08957959.2020.1830080

DO - 10.1080/08957959.2020.1830080

M3 - Article

AN - SCOPUS:85092697331

SN - 0895-7959

VL - 40

SP - 478

EP - 487

JO - High Pressure Research

JF - High Pressure Research

IS - 4

ER -

In situ formation of coestite under hydrothermal conditions

Abstract

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Keywords

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