High-pressure experimental growth of diamond using C-K2CO3-KCl as an analogue for Cl-bearing carbonate fluid. / Tomlinson, Emma; Jones, Adrian P.; Milledge, Judith.

In: Lithos, Vol. 77, No. 1-4, 09.2004, p. 287-294.

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High-pressure experimental growth of diamond using C-K2CO3-KCl as an analogue for Cl-bearing carbonate fluid. / Tomlinson, Emma; Jones, Adrian P.; Milledge, Judith.

In: Lithos, Vol. 77, No. 1-4, 09.2004, p. 287-294.

Research output: Contribution to journalArticlepeer-review

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Tomlinson, Emma ; Jones, Adrian P. ; Milledge, Judith. / High-pressure experimental growth of diamond using C-K2CO3-KCl as an analogue for Cl-bearing carbonate fluid. In: Lithos. 2004 ; Vol. 77, No. 1-4. pp. 287-294.

BibTeX

@article{58805ae35c924fc497eb74a4cefb12a9,
title = "High-pressure experimental growth of diamond using C-K2CO3-KCl as an analogue for Cl-bearing carbonate fluid",
abstract = "High-pressure, high-temperature diamond growth experiments have been conducted in the system C-K2CO3-KCl at 1050-1420degreesC, 7.0-7.7 GPa. KCl is of interest because of the strong effect of halogens on the phase relations of carbonate-rich systems [Geophys. Res. Lett. 30 (2003) 1022] and because of the occurrence of KCl coexisting with alkali silicate-carbonate fluids in natural-coated diamond [Geochim. Cosmochim. Acta 64 (2000) 717]. We have used system C-K2CO3-KCl as an analogue for these mantle fluids in diamond growth experiments. The presence of KCl reduces the potassium carbonate liquidus to < 1000degreesC at 7.7 GPa, allowing it to act as a solvent catalyst for diamond growth at temperatures below the continental geotherm. This is a reduction on the minimum diamond growth temperature reported in the alkali-carbonate-C-O-H system [Lithos 60 (2002) 145]. Diamond growth using carbonate solvent catalysts is characterised by a relatively long induction period. However, the addition of KCl also reduced the period for diamond growth in carbonate to much less than 5 min; no such induction period appears to be necessary. It is suggested that KCl destabilises carbonate, allowing greater solubility and diffusion of carbon.",
author = "Emma Tomlinson and Jones, {Adrian P.} and Judith Milledge",
year = "2004",
month = sep,
language = "English",
volume = "77",
pages = "287--294",
journal = "Lithos",
issn = "0024-4937",
publisher = "Elsevier",
number = "1-4",

}

RIS

TY - JOUR

T1 - High-pressure experimental growth of diamond using C-K2CO3-KCl as an analogue for Cl-bearing carbonate fluid

AU - Tomlinson, Emma

AU - Jones, Adrian P.

AU - Milledge, Judith

PY - 2004/9

Y1 - 2004/9

N2 - High-pressure, high-temperature diamond growth experiments have been conducted in the system C-K2CO3-KCl at 1050-1420degreesC, 7.0-7.7 GPa. KCl is of interest because of the strong effect of halogens on the phase relations of carbonate-rich systems [Geophys. Res. Lett. 30 (2003) 1022] and because of the occurrence of KCl coexisting with alkali silicate-carbonate fluids in natural-coated diamond [Geochim. Cosmochim. Acta 64 (2000) 717]. We have used system C-K2CO3-KCl as an analogue for these mantle fluids in diamond growth experiments. The presence of KCl reduces the potassium carbonate liquidus to < 1000degreesC at 7.7 GPa, allowing it to act as a solvent catalyst for diamond growth at temperatures below the continental geotherm. This is a reduction on the minimum diamond growth temperature reported in the alkali-carbonate-C-O-H system [Lithos 60 (2002) 145]. Diamond growth using carbonate solvent catalysts is characterised by a relatively long induction period. However, the addition of KCl also reduced the period for diamond growth in carbonate to much less than 5 min; no such induction period appears to be necessary. It is suggested that KCl destabilises carbonate, allowing greater solubility and diffusion of carbon.

AB - High-pressure, high-temperature diamond growth experiments have been conducted in the system C-K2CO3-KCl at 1050-1420degreesC, 7.0-7.7 GPa. KCl is of interest because of the strong effect of halogens on the phase relations of carbonate-rich systems [Geophys. Res. Lett. 30 (2003) 1022] and because of the occurrence of KCl coexisting with alkali silicate-carbonate fluids in natural-coated diamond [Geochim. Cosmochim. Acta 64 (2000) 717]. We have used system C-K2CO3-KCl as an analogue for these mantle fluids in diamond growth experiments. The presence of KCl reduces the potassium carbonate liquidus to < 1000degreesC at 7.7 GPa, allowing it to act as a solvent catalyst for diamond growth at temperatures below the continental geotherm. This is a reduction on the minimum diamond growth temperature reported in the alkali-carbonate-C-O-H system [Lithos 60 (2002) 145]. Diamond growth using carbonate solvent catalysts is characterised by a relatively long induction period. However, the addition of KCl also reduced the period for diamond growth in carbonate to much less than 5 min; no such induction period appears to be necessary. It is suggested that KCl destabilises carbonate, allowing greater solubility and diffusion of carbon.

M3 - Article

VL - 77

SP - 287

EP - 294

JO - Lithos

JF - Lithos

SN - 0024-4937

IS - 1-4

ER -