The system K2CO3-MgCO3 at 6 GPa and 900-1450  C

Shatskiy, Anton; Sharygin, Igor S.; Gavryushkin, Pavel N.; Litasov, Konstantin D.; Borzdov, Yuri M.; Shcherbakova, Anastasia; Higo, Yuji; Funakoshi, K.; Palyanov, Yuri N.; Ohtani, Eiji

doi:10.2138/am.2013.4407

Cited by 83 publications

(47 citation statements)

References 65 publications

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“…Both axial and radial thermal gradients, measured using the two-pyroxene thermometer (Brey and Köhler, 1990), were found to be about 10 o C/mm. Thermal modeling using software of Hernlund et al (2006) demonstrated similar results (see Shatskiy et al (2013b) for more details).…”

Section: High-pressure Experimentssupporting

confidence: 57%

See 1 more Smart Citation

Melting phase relations of the Udachnaya-East Group-I kimberlite at 3.0–6.5 GPa: Experimental evidence for alkali-carbonatite composition of primary kimberlite melts and implications for mantle plumes

et al. 2015

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Section: High-pressure Experimentssupporting

confidence: 57%

“…Deviations of pressure from the desirable value during heating to 900-1500 °C in the given cell and press load did not exeed ± 0.5 GPa (usually ±0.2 GPa), as confirmed by in situ XRD experiments (Shatskiy et al, 2013b).…”

Section: High-pressure Experimentssupporting

confidence: 52%

Melting phase relations of the Udachnaya-East Group-I kimberlite at 3.0–6.5 GPa: Experimental evidence for alkali-carbonatite composition of primary kimberlite melts and implications for mantle plumes

et al. 2015

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“…Taking into account the results of previous studies on diamond crystallization in different systems modeling natural media, we can discuss the possible effects of the individual components on the diamond-forming processes. First, it should be noted that the presence of alkalies will significantly decrease the temperature of generation of carbonate melts (37)(38)(39). A similar effect will be produced by H 2 O-CO 2 fluids (40-42).…”

Section: Significancementioning

confidence: 98%

Mantle–slab interaction and redox mechanism of diamond formation

Palyanov

Bataleva

Sokol

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

176

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Subduction tectonics imposes an important role in the evolution of the interior of the Earth and its global carbon cycle; however, the mechanism of the mantle-slab interaction remains unclear. Here, we demonstrate the results of high-pressure redox-gradient experiments on the interactions between Mg-Ca-carbonate and metallic iron, modeling the processes at the mantle-slab boundary; thereby, we present mechanisms of diamond formation both ahead of and behind the redox front. It is determined that, at oxidized conditions, a low-temperature Ca-rich carbonate melt is generated. This melt acts as both the carbon source and crystallization medium for diamond, whereas at reduced conditions, diamond crystallizes only from the Fe-C melt. The redox mechanism revealed in this study is used to explain the contrasting heterogeneity of natural diamonds, as seen in the composition of inclusions, carbon isotopic composition, and nitrogen impurity content.carbonate-iron interaction | high-pressure experiment | mantle mineralogy | deep carbon cycle S ubduction of crustal material plays an important role in the global carbon cycle (1-6). Depending on oxygen fugacity and pressure-temperature (P-T) conditions, carbon exists in the Earth's interior in the form of carbides, diamond, graphite, hydrocarbons, carbonates, and CO 2 (7-11). In the upper mantle, the oxygen fugacity (fO 2 ) varies from one to five log units below the fayalitemagnetite-quartz (FMQ) buffer, with a trend of a decrease with depth (6,(12)(13)(14)(15). At a depth of ∼250 km, mantle is reported to become metal saturated (16, 17), which holds true for all mantle regions below, including the transition zone and lower mantle. The subduction of the oxidized crustal material occurs to depths greater than 600 km (4-6). The main carbon-bearing minerals of the subducted materials are carbonates, which are thermodynamically stable up to P-T conditions of the lower mantle (10,11,18). As evidenced by the compositions of inclusions in diamond, which vary from strongly reduced, e.g., metallic iron and carbides (19-23), to oxidized, e.g., carbonates and CO 2 (6,20,(24)(25)(26)(27)(28), carbonates may be involved in the reactions with reduced deep-seated rocks, including Fe 0 -bearing species (29-31). A scale of these reactions is determined mainly by the capacity of subducted carbonate-bearing domains. An important consequence of such an interaction is that it can produce diamond. However, studies on diamond synthesis via the reactions between oxidized and reduced phases are limited (32-35).To understand the mechanisms of the interaction of carbonbearing oxidized-and reduced-mineral assemblages, we performed high-pressure experiments with an iron-carbonate system; an approach was used that enabled the creation of an oxygen fugacity gradient in the capsules (Materials and Methods and SI Materials and Methods). Results and DiscussionThe experimental results and the phase compositions are given in Table 1 and Table S1, respectively. At temperatures of 1,000 and 1,100°C, the iron-car...

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“…Moreover, alkali carbonates can be used as a medium for the formation of diamonds in the Earth's mantle (Pal'yanov et al, 1999(Pal'yanov et al, , 2002Sokol et al, 2000). It is thus essential to understand the behavior of alkali carbonate liquids at mantle conditions, which has been discussed only in recent studies (Dobson et al, 1996;Liu and Lange, 2003;Liu et al, 2007;Litasov et al, 2013;Shatskiy et al, 2013aShatskiy et al, , 2013b. In the research of Litasov et al (2013), the true solidi of Na-and K-bearing carbonate systems at high pressure were determined, and the possibility of subducting alkaline carbonates melting at the transition zone was reported.…”

Section: Introductionmentioning

confidence: 99%

“…In the research of Litasov et al (2013), the true solidi of Na-and K-bearing carbonate systems at high pressure were determined, and the possibility of subducting alkaline carbonates melting at the transition zone was reported. Phase relations in simple binary carbonates systems such as K 2 CO 3 -MgCO 3 and Na 2 CO 3 -CaCO 3 have been studied by Shatskiy et al (2013aShatskiy et al ( , 2013b.…”

Section: Introductionmentioning

confidence: 99%

The K<sub>2</sub>CO<sub>3</sub> fusion curve revisited: New experiments at pressures up to 12 GPa

Wang

Liu

Inoue

et al. 2016

Journal of Mineralogical and Petrological Sciences

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The melting temperatures of K 2 CO 3 were experimentally determined to be 1220 ± 20°C (4.0 ± 0.5 GPa), 1290 ± 10°C (9.0 ± 0.5 GPa), and 1313 ± 10°C (11.5 ± 0.5 GPa) in a 2000 ton split-sphere apparatus and 1195 ± 15°C (5.0 ± 0.5 GPa) in a 1000 ton uniaxial split-cylinder apparatus. The fusion curves of K 2 CO 3 were calculated up to~12.0 GPa for various K 0 ′ (pressure dependence of bulk modulus) values of the liquid, according to the thermodynamic properties for crystalline and liquid K 2 CO 3 . On the basis of these experimental results and fusion curves of K 2 CO 3 , the K 0 ′ for liquid K 2 CO 3 is constrained to be~14.4 ± 1.1 at pressures lower than 5.0 GPa in a third-order Birch-Murnaghan equation of state (EOS). However, the results at pressures above 9.0 GPa deviate from this trend, which suggests a possible phase transformation in either the crystalline or liquid phase of K 2 CO 3 between 5.0 and 9.0 GPa. Determination of liquid K 0 ′ allows the density of K 2 CO 3 liquid to be calculated to high pressure. In comparison with other common carbonates, K 2 CO 3 is shown to have the lowest melting temperature.

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The system K2CO3-MgCO3 at 6 GPa and 900-1450 C

Cited by 83 publications

References 65 publications

Melting phase relations of the Udachnaya-East Group-I kimberlite at 3.0–6.5 GPa: Experimental evidence for alkali-carbonatite composition of primary kimberlite melts and implications for mantle plumes

Melting phase relations of the Udachnaya-East Group-I kimberlite at 3.0–6.5 GPa: Experimental evidence for alkali-carbonatite composition of primary kimberlite melts and implications for mantle plumes

Mantle–slab interaction and redox mechanism of diamond formation

The K<sub>2</sub>CO<sub>3</sub> fusion curve revisited: New experiments at pressures up to 12 GPa

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