Magnesite-bearing inclusion assemblage in natural diamond

Wang, Alian; Pasteris, Jill Dill; Meyer, H. O. A.; Dele-Duboi, Marie L.

doi:10.1016/0012-821x(96)00053-2

Cited by 127 publications

(52 citation statements)

References 37 publications

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“…Inclusions of Ba-rich carbonate were previously observed in a cloudy diamond from Udachnaya (Schrauder and Navon, 1993). Ca-Mg carbonates are not common as inclusions, but nonetheless were reported from Siberia, South Africa, China and Canada (Leung, 1984(Leung, , 1990Bulanova and Pavlova, 1987;Wang et al, 1996;Davies et al, 1999;McDade and Harris, 1999). Ca-Mg-Fe carbonates were also found as secondary phases in fluid inclusions in fibrous diamonds (Guthrie et al, 1991;Walmsley and Lang, 1992).…”

Section: Carbonatementioning

confidence: 97%

Fluid and mineral inclusions in cloudy diamonds from Koffiefontein, South Africa

Izraeli

Harris

Navon

2004

Geochimica et Cosmochimica Acta

110

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Section: Carbonatementioning

confidence: 97%

Fluid and mineral inclusions in cloudy diamonds from Koffiefontein, South Africa

Izraeli

Harris

Navon

2004

Geochimica et Cosmochimica Acta

110

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“…Findings of carbonatebearing UHP mineral assemblages represent natural evidence of the stability of carbonates at upper mantle pressures. Inclusions of magnesite in natural diamonds from the Finsch kimberlite pipe in South Africa (Wang et al 1996) demonstrate the occurrence of carbonates in the mantle at depths exceeding 120 km. Similar dolomite and Ba-Sr carbonate inclusions in diamonds, from two different kimberlite regions of the Siberian craton, have been reported by Logvinova et al (2008).…”

Section: Introductionmentioning

confidence: 99%

Ternary Ca–Fe–Mg carbonates: subsolidus phase relations at 3.5 GPa and a thermodynamic solid solution model including order/disorder

Franzolin

Schmidt

Poli

2010

Contrib Mineral Petrol

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Subduction carries atmospheric and crustal carbon hosted in the altered oceanic crystalline basement and in pelagic sediments back into the mantle. Reactions involving complex carbonate solid solutions(s) lead to the transfer of carbon into the mantle, where it may be stored as graphite/diamond, in fluids or melts, or in carbonates. To constrain the thermodynamics and thus reactions of the ternary Ca-Mg-Fe carbonate solid solution, piston cylinder experiments have been performed in the system CaCO 3 -MgCO 3 -FeCO 3 at a pressure of 3.5 GPa and temperatures of 900-1,100°C. At 900°C, the system has two miscibility gaps: the solvus dolomite-calcite, which closes at X MgCO3 *0.7, and the solvus dolomite-magnesite, which ranges from the Mg to the Fe side of the ternary. With increasing temperature, the two miscibility gaps become narrower until complete solid solutions between CaCO 3 -Ca 0.5 Mg 0.5 CO 3 is reached at 1,100°C and between CaCO 3 -FeCO 3 at 1,000°C. The solvi are characterized by strong compositional asymmetry and by an order-disorder mechanism. To deal with these features, a solid solution model based on the van Laar macroscopic formalism has been calculated for ternary carbonates. This thermodynamic solid solution model is able to reproduce the experimentally constrained phase relations in the system CaCO 3 -MgCO 3 -FeCO 3 in a broad P-T range. To test our model, calculated phase equilibria were compared with experiments performed in carbonated mafic protolithes, demonstrating the reliability of our solid solution model at pressures up to 6 GPa in complex systems.

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“…Taking into account the variations in inclusion composition ranging from pure CO 2 fluid (Schrauder and Navon, 1993;Navon, 1999) to carbonates (Bulanova and Pavlova, 1987;Wang et al, 0016-7037/$ -see front matter Ó 2009 Elsevier Ltd. All rights reserved. doi:10.…”

Section: Introductionmentioning

confidence: 99%

Fluid regime and diamond formation in the reduced mantle: Experimental constraints

Sokol

Palyanova

Palyanov

et al. 2009

Geochimica et Cosmochimica Acta

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Magnesite-bearing inclusion assemblage in natural diamond

Cited by 127 publications

References 37 publications

Fluid and mineral inclusions in cloudy diamonds from Koffiefontein, South Africa

Fluid and mineral inclusions in cloudy diamonds from Koffiefontein, South Africa

Ternary Ca–Fe–Mg carbonates: subsolidus phase relations at 3.5 GPa and a thermodynamic solid solution model including order/disorder

Fluid regime and diamond formation in the reduced mantle: Experimental constraints

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