HIGH-PRESSURE EXPERIMENTAL GROWTH OF DIAMOND USING C-K2CO3-KCL AS AN ANALOGUE FOR CL-BEARING CARBONATE FLUID
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dc.contributor.author | Tomlinson E. | |
dc.contributor.author | Jones A. | |
dc.contributor.author | Milledge J. | |
dc.date.accessioned | 2022-10-24T08:25:15Z | |
dc.date.available | 2022-10-24T08:25:15Z | |
dc.date.issued | 2004 | |
dc.identifier | https://elibrary.ru/item.asp?id=14572162 | |
dc.identifier.citation | Lithos, 2004, 77, 1-4 SPEC. ISS., 287-294 | |
dc.identifier.issn | 0024-4937 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/39050 | |
dc.description.abstract | High-pressure, high-temperature diamond growth experiments have been conducted in the system C–K2CO3–KCl at 1050–1420 °C, 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 ≤1000 °C 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 5 min; no such induction period appears to be necessary. It is suggested that KCl destabilises carbonate, allowing greater solubility and diffusion of carbon. | |
dc.subject | High experiments | |
dc.subject | Diamond growth | |
dc.subject | Potassium carbonate | |
dc.subject | Potassium chloride | |
dc.title | HIGH-PRESSURE EXPERIMENTAL GROWTH OF DIAMOND USING C-K2CO3-KCL AS AN ANALOGUE FOR CL-BEARING CARBONATE FLUID | |
dc.type | Статья |
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