Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
Phase relationships in the system K2CO3-CaCO3 at 6 GPa and 900-1450°C. / Shatskiy, Anton; Borzdov, Yuri M.; Litasov, Konstantin D. и др.
в: American Mineralogist, Том 100, № 1, 01.01.2015, стр. 223-232.Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
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TY - JOUR
T1 - Phase relationships in the system K2CO3-CaCO3 at 6 GPa and 900-1450°C
AU - Shatskiy, Anton
AU - Borzdov, Yuri M.
AU - Litasov, Konstantin D.
AU - Sharygin, Igor S.
AU - Palyanov, Yuri N.
AU - Ohtani, Eiji
PY - 2015/1/1
Y1 - 2015/1/1
N2 - Phase relations in the system K2CO3-CaCO3 have been studied in the compositional range, X(K2CO3), from 100 to 10 mol%, at 6.0 GPa and 900-1450°C. At 900-950°C, the system has three intermediate compounds: K6Ca2(CO3)5, K2Ca(CO3)2, and K2Ca3(CO3)4. The K2Ca(CO3)2 compound decomposes to the K6Ca2(CO3)5 + K2Ca3(CO3)4 assembly above 950°C. The K6Ca2(CO3)5 and K2Ca3(CO3)4 compounds melt congruently slightly above 1200 and 1300°C, respectively. The eutectics were established at 64 and 44 mol% near 1200°C and at 23 mol% near 1300°C. K2CO3 remains as a liquidus phase at 1300°C and 75 mol% and melts at 1425 ± 20°C. Aragonite remains as a liquidus phase at 1300°C and 20 mol% and at 1400°C and 10 mol%. CaCO3 solubility in K2CO3 and K2CO3 solubility in aragonite are below the detection limit (<0.5 mol%). Infiltration of subduction-derived K-rich Ca-Mg-Fe-carbonatite into the Fe0-saturated mantle causes the extraction of (Mg,Fe)CO3 components from the melt, which shifts its composition toward K-Ca-carbonatite. According to our data this melt can be stable at the P-T conditions of subcratonic lithosphere with geothermal gradient of 40 mW/m2 corresponding to temperature of 1200°C at 6 GPa.
AB - Phase relations in the system K2CO3-CaCO3 have been studied in the compositional range, X(K2CO3), from 100 to 10 mol%, at 6.0 GPa and 900-1450°C. At 900-950°C, the system has three intermediate compounds: K6Ca2(CO3)5, K2Ca(CO3)2, and K2Ca3(CO3)4. The K2Ca(CO3)2 compound decomposes to the K6Ca2(CO3)5 + K2Ca3(CO3)4 assembly above 950°C. The K6Ca2(CO3)5 and K2Ca3(CO3)4 compounds melt congruently slightly above 1200 and 1300°C, respectively. The eutectics were established at 64 and 44 mol% near 1200°C and at 23 mol% near 1300°C. K2CO3 remains as a liquidus phase at 1300°C and 75 mol% and melts at 1425 ± 20°C. Aragonite remains as a liquidus phase at 1300°C and 20 mol% and at 1400°C and 10 mol%. CaCO3 solubility in K2CO3 and K2CO3 solubility in aragonite are below the detection limit (<0.5 mol%). Infiltration of subduction-derived K-rich Ca-Mg-Fe-carbonatite into the Fe0-saturated mantle causes the extraction of (Mg,Fe)CO3 components from the melt, which shifts its composition toward K-Ca-carbonatite. According to our data this melt can be stable at the P-T conditions of subcratonic lithosphere with geothermal gradient of 40 mW/m2 corresponding to temperature of 1200°C at 6 GPa.
KW - Alkaline carbonates
KW - Buetschliite
KW - Carbonatite
KW - Earth's mantle
KW - Fairchildite
KW - High-pressure experiment
UR - http://www.scopus.com/inward/record.url?scp=84921346700&partnerID=8YFLogxK
U2 - 10.2138/am-2015-5001
DO - 10.2138/am-2015-5001
M3 - Article
AN - SCOPUS:84921346700
VL - 100
SP - 223
EP - 232
JO - American Mineralogist
JF - American Mineralogist
SN - 0003-004X
IS - 1
ER -
ID: 25728238