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Effect of alkalis on the reaction of clinopyroxene with Mg-carbonate at 6 GPa : Implications for partial melting of carbonated lherzolite. / Shatskiy, Anton; Podborodnikov, Ivan V.; Arefiev, Anton V. et al.

In: American Mineralogist, Vol. 102, No. 9, 01.09.2017, p. 1934-1946.

Research output: Contribution to journalArticlepeer-review

Harvard

Shatskiy, A, Podborodnikov, IV, Arefiev, AV, Litasov, KD, Chanyshev, AD, Sharygin, IS, Karmanov, NS & Ohtani, E 2017, 'Effect of alkalis on the reaction of clinopyroxene with Mg-carbonate at 6 GPa: Implications for partial melting of carbonated lherzolite', American Mineralogist, vol. 102, no. 9, pp. 1934-1946. https://doi.org/10.2138/am-2017-6048

APA

Shatskiy, A., Podborodnikov, I. V., Arefiev, A. V., Litasov, K. D., Chanyshev, A. D., Sharygin, I. S., Karmanov, N. S., & Ohtani, E. (2017). Effect of alkalis on the reaction of clinopyroxene with Mg-carbonate at 6 GPa: Implications for partial melting of carbonated lherzolite. American Mineralogist, 102(9), 1934-1946. https://doi.org/10.2138/am-2017-6048

Vancouver

Shatskiy A, Podborodnikov IV, Arefiev AV, Litasov KD, Chanyshev AD, Sharygin IS et al. Effect of alkalis on the reaction of clinopyroxene with Mg-carbonate at 6 GPa: Implications for partial melting of carbonated lherzolite. American Mineralogist. 2017 Sept 1;102(9):1934-1946. doi: 10.2138/am-2017-6048

Author

Shatskiy, Anton ; Podborodnikov, Ivan V. ; Arefiev, Anton V. et al. / Effect of alkalis on the reaction of clinopyroxene with Mg-carbonate at 6 GPa : Implications for partial melting of carbonated lherzolite. In: American Mineralogist. 2017 ; Vol. 102, No. 9. pp. 1934-1946.

BibTeX

@article{f366ff6920a64c9b9a0a6c628acfaa60,
title = "Effect of alkalis on the reaction of clinopyroxene with Mg-carbonate at 6 GPa: Implications for partial melting of carbonated lherzolite",
abstract = "The reaction between clinopyroxene and Mg-carbonate is supposed to define the solidus of carbonated lherzolite at pressures exceeding 5 GPa. To investigate the effect of alkalis on this reaction, subsolidus and melting phase relations in the following systems have been examined at 6 GPa: CaMgSi2O6+2MgCO3 (Di+2Mgs); CaMgSi2O6+NaAlSi2O6+2MgCO3 (Di+Jd+2Mgs); CaMgSi2O6+Na2Mg(CO3)2 (Di+Na2Mg); and CaMgSi2O6+K2Mg(CO3)2 (Di+K2Mg). The Di+2Mgs system begins to melt at 1400 °C via the approximate reaction CaMgSi2O6 (clinopyroxene) + 2MgCO3 (magnesite) = CaMg(CO3)2 (liquid) + Mg2Si2O6 (orthopyroxene), which leads to an essentially carbonate liquid (L) with composition Ca0.56Mg0.44CO3 + 3.5 mol% SiO2. The initial melting of the Di+Jd+2Mgs system occurs at 1350 °C via the reaction 2CaMgSi2O6 (clinopyroxene) + 2NaAlSi2O6 (clinopyroxene) + 8MgCO3 (magnesite) = Mg3Al2Si3O12 (garnet) + 5MgSiO3 (clinopyroxene) + 2CaMg(CO3)2 (liquid) + Na2CO3 (liquid) + 3CO2 (liquid and/or fluid), which yields the carbonate liquid with approximate composition of 10Na2CO3 ·90Ca0.5Mg0.5CO3 + 2 mol% SiO2. The systems Di+Na2Mg and Di+K2Mg start to melt at 1100 and 1050 °C, respectively, via the reaction CaMgSi2O6 (clinopyroxene) + 2(Na or K)2Mg(CO3)2 (solid) = Mg2Si2O6 (orthopyroxene) + (Na or K)4CaMg(CO3)4 (liquid). The resulting melts have the alkali-rich carbonate compositions Na2Ca0.4Mg0.6(CO3)2 + 0.4 mol% SiO2 and 43 K2CO3 ·57Ca0.4Mg0.6CO3 + 0.6 mol% SiO2. These melts do not undergo significant changes as temperature rises to 1400 °C, retaining their calcium number and a high Na2O, K2O, and low SiO2. We suggest that the clinopyroxene-Mg-carbonate reaction controlling the solidus of carbonated lherzolite is very sensitive to the carbonate composition and shifts from 1400 to 1050 °C at 6 GPa, which yields K-rich carbonate melt if the subsolidus assemblage contains the K2Mg(CO3)2 compound. Such a decrease in solidus temperature has been previously observed in the K-rich carbonated lherzolite system. Although a presence of eitelite, Na2Mg(CO3)2, has a similar effect, this mineral cannot be considered as a potential host of Na in carbonated lherzolite, because the whole Na added into the system dissolves as jadeite component in clinopyroxene if bulk Al/Na ≥ 1. The presence of jadeite component in clinopyroxene has little impact on the temperature of the solidus reaction decreasing it to 1350 °C at 6 GPa.",
keywords = "carbonated peridotite, Carbonatite, Earth's mantle, eitelite, high-pressure experiment, KMg(CO), partial melting, SYSTEM, K2Mg(CO3)(2), HIGH-PRESSURE, DIAMOND, MICROANALYSIS, PERIDOTITE XENOLITHS, MODEL, UDACHNAYA KIMBERLITE, SOLIDUS, CONSTRAINTS, PHASE-RELATIONS",
author = "Anton Shatskiy and Podborodnikov, {Ivan V.} and Arefiev, {Anton V.} and Litasov, {Konstantin D.} and Chanyshev, {Artem D.} and Sharygin, {Igor S.} and Karmanov, {Nikolai S.} and Eiji Ohtani",
year = "2017",
month = sep,
day = "1",
doi = "10.2138/am-2017-6048",
language = "English",
volume = "102",
pages = "1934--1946",
journal = "American Mineralogist",
issn = "0003-004X",
publisher = "Walter de Gruyter GmbH",
number = "9",

}

RIS

TY - JOUR

T1 - Effect of alkalis on the reaction of clinopyroxene with Mg-carbonate at 6 GPa

T2 - Implications for partial melting of carbonated lherzolite

AU - Shatskiy, Anton

AU - Podborodnikov, Ivan V.

AU - Arefiev, Anton V.

AU - Litasov, Konstantin D.

AU - Chanyshev, Artem D.

AU - Sharygin, Igor S.

AU - Karmanov, Nikolai S.

AU - Ohtani, Eiji

PY - 2017/9/1

Y1 - 2017/9/1

N2 - The reaction between clinopyroxene and Mg-carbonate is supposed to define the solidus of carbonated lherzolite at pressures exceeding 5 GPa. To investigate the effect of alkalis on this reaction, subsolidus and melting phase relations in the following systems have been examined at 6 GPa: CaMgSi2O6+2MgCO3 (Di+2Mgs); CaMgSi2O6+NaAlSi2O6+2MgCO3 (Di+Jd+2Mgs); CaMgSi2O6+Na2Mg(CO3)2 (Di+Na2Mg); and CaMgSi2O6+K2Mg(CO3)2 (Di+K2Mg). The Di+2Mgs system begins to melt at 1400 °C via the approximate reaction CaMgSi2O6 (clinopyroxene) + 2MgCO3 (magnesite) = CaMg(CO3)2 (liquid) + Mg2Si2O6 (orthopyroxene), which leads to an essentially carbonate liquid (L) with composition Ca0.56Mg0.44CO3 + 3.5 mol% SiO2. The initial melting of the Di+Jd+2Mgs system occurs at 1350 °C via the reaction 2CaMgSi2O6 (clinopyroxene) + 2NaAlSi2O6 (clinopyroxene) + 8MgCO3 (magnesite) = Mg3Al2Si3O12 (garnet) + 5MgSiO3 (clinopyroxene) + 2CaMg(CO3)2 (liquid) + Na2CO3 (liquid) + 3CO2 (liquid and/or fluid), which yields the carbonate liquid with approximate composition of 10Na2CO3 ·90Ca0.5Mg0.5CO3 + 2 mol% SiO2. The systems Di+Na2Mg and Di+K2Mg start to melt at 1100 and 1050 °C, respectively, via the reaction CaMgSi2O6 (clinopyroxene) + 2(Na or K)2Mg(CO3)2 (solid) = Mg2Si2O6 (orthopyroxene) + (Na or K)4CaMg(CO3)4 (liquid). The resulting melts have the alkali-rich carbonate compositions Na2Ca0.4Mg0.6(CO3)2 + 0.4 mol% SiO2 and 43 K2CO3 ·57Ca0.4Mg0.6CO3 + 0.6 mol% SiO2. These melts do not undergo significant changes as temperature rises to 1400 °C, retaining their calcium number and a high Na2O, K2O, and low SiO2. We suggest that the clinopyroxene-Mg-carbonate reaction controlling the solidus of carbonated lherzolite is very sensitive to the carbonate composition and shifts from 1400 to 1050 °C at 6 GPa, which yields K-rich carbonate melt if the subsolidus assemblage contains the K2Mg(CO3)2 compound. Such a decrease in solidus temperature has been previously observed in the K-rich carbonated lherzolite system. Although a presence of eitelite, Na2Mg(CO3)2, has a similar effect, this mineral cannot be considered as a potential host of Na in carbonated lherzolite, because the whole Na added into the system dissolves as jadeite component in clinopyroxene if bulk Al/Na ≥ 1. The presence of jadeite component in clinopyroxene has little impact on the temperature of the solidus reaction decreasing it to 1350 °C at 6 GPa.

AB - The reaction between clinopyroxene and Mg-carbonate is supposed to define the solidus of carbonated lherzolite at pressures exceeding 5 GPa. To investigate the effect of alkalis on this reaction, subsolidus and melting phase relations in the following systems have been examined at 6 GPa: CaMgSi2O6+2MgCO3 (Di+2Mgs); CaMgSi2O6+NaAlSi2O6+2MgCO3 (Di+Jd+2Mgs); CaMgSi2O6+Na2Mg(CO3)2 (Di+Na2Mg); and CaMgSi2O6+K2Mg(CO3)2 (Di+K2Mg). The Di+2Mgs system begins to melt at 1400 °C via the approximate reaction CaMgSi2O6 (clinopyroxene) + 2MgCO3 (magnesite) = CaMg(CO3)2 (liquid) + Mg2Si2O6 (orthopyroxene), which leads to an essentially carbonate liquid (L) with composition Ca0.56Mg0.44CO3 + 3.5 mol% SiO2. The initial melting of the Di+Jd+2Mgs system occurs at 1350 °C via the reaction 2CaMgSi2O6 (clinopyroxene) + 2NaAlSi2O6 (clinopyroxene) + 8MgCO3 (magnesite) = Mg3Al2Si3O12 (garnet) + 5MgSiO3 (clinopyroxene) + 2CaMg(CO3)2 (liquid) + Na2CO3 (liquid) + 3CO2 (liquid and/or fluid), which yields the carbonate liquid with approximate composition of 10Na2CO3 ·90Ca0.5Mg0.5CO3 + 2 mol% SiO2. The systems Di+Na2Mg and Di+K2Mg start to melt at 1100 and 1050 °C, respectively, via the reaction CaMgSi2O6 (clinopyroxene) + 2(Na or K)2Mg(CO3)2 (solid) = Mg2Si2O6 (orthopyroxene) + (Na or K)4CaMg(CO3)4 (liquid). The resulting melts have the alkali-rich carbonate compositions Na2Ca0.4Mg0.6(CO3)2 + 0.4 mol% SiO2 and 43 K2CO3 ·57Ca0.4Mg0.6CO3 + 0.6 mol% SiO2. These melts do not undergo significant changes as temperature rises to 1400 °C, retaining their calcium number and a high Na2O, K2O, and low SiO2. We suggest that the clinopyroxene-Mg-carbonate reaction controlling the solidus of carbonated lherzolite is very sensitive to the carbonate composition and shifts from 1400 to 1050 °C at 6 GPa, which yields K-rich carbonate melt if the subsolidus assemblage contains the K2Mg(CO3)2 compound. Such a decrease in solidus temperature has been previously observed in the K-rich carbonated lherzolite system. Although a presence of eitelite, Na2Mg(CO3)2, has a similar effect, this mineral cannot be considered as a potential host of Na in carbonated lherzolite, because the whole Na added into the system dissolves as jadeite component in clinopyroxene if bulk Al/Na ≥ 1. The presence of jadeite component in clinopyroxene has little impact on the temperature of the solidus reaction decreasing it to 1350 °C at 6 GPa.

KW - carbonated peridotite

KW - Carbonatite

KW - Earth's mantle

KW - eitelite

KW - high-pressure experiment

KW - KMg(CO)

KW - partial melting

KW - SYSTEM

KW - K2Mg(CO3)(2)

KW - HIGH-PRESSURE

KW - DIAMOND

KW - MICROANALYSIS

KW - PERIDOTITE XENOLITHS

KW - MODEL

KW - UDACHNAYA KIMBERLITE

KW - SOLIDUS

KW - CONSTRAINTS

KW - PHASE-RELATIONS

UR - http://www.scopus.com/inward/record.url?scp=85029355592&partnerID=8YFLogxK

U2 - 10.2138/am-2017-6048

DO - 10.2138/am-2017-6048

M3 - Article

AN - SCOPUS:85029355592

VL - 102

SP - 1934

EP - 1946

JO - American Mineralogist

JF - American Mineralogist

SN - 0003-004X

IS - 9

ER -

ID: 9911119