Methane in Carbonate Melt Inclusions in the Rock-Forming Minerals of Calc-Silicate Rocks of the Kokchetav Massif

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Methane in Carbonate Melt Inclusions in the Rock-Forming Minerals of Calc-Silicate Rocks of the Kokchetav Massif. / Mikhno, A. O.; Vinogradova, Yu G.; Rashchenko, S. V. et al.

In: Doklady Earth Sciences, Vol. 508, No. 1, 01.2023, p. 6-11.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{fc914aba1f554065903c8d731c8d6329,

title = "Methane in Carbonate Melt Inclusions in the Rock-Forming Minerals of Calc-Silicate Rocks of the Kokchetav Massif",

abstract = "Secondary inclusions of the carbonate melt in garnets and clinopyroxenes from ultrahigh-pressure calc-silicate rocks were studied. Secondary carbonate inclusions are located in the healed cracks confined to large (100 µm–3 mm) primary carbonate inclusions in garnet. In some cases, the healed cracks form plates that intersect both garnet and inclusions of potassium-bearing clinopyroxene in garnet. The high content of K2O (0.64 wt %) in the healed cracks in clinopyroxene inclusions suggests that their formation and healing took place during the stage of ultrahigh pressures. Interpretation of the Raman spectra of the secondary inclusions of the carbonate melt in garnet and clinopyroxene confirmed the presence of the following phases: methane, graphite, calcite, dolomite, muscovite, and phlogopite. The data obtained allowed us to recognize the stage of ultrahigh pressure metamorphism in the calc–silicate rocks of the Kokchetav massif, during which methane accumulation in the carbonate melt took place, for the first time.",

keywords = "metacarbonates, methane, partial melting, subduction, ultrahigh pressure metamorphism",

author = "Mikhno, {A. O.} and Vinogradova, {Yu G.} and Rashchenko, {S. V.} and Korsakov, {A. V.}",

note = "This study was supported by the Russian Science Foundation, project no. 22-27-00667, https://rscf.ru/project/22-27-00667/ . Fieldwork and sampling were also supported by the Russian Science Foundation, project no. 18-17-00186.",

year = "2023",

month = jan,

doi = "10.1134/S1028334X22601882",

language = "English",

volume = "508",

pages = "6--11",

journal = "Doklady Earth Sciences",

issn = "1028-334X",

publisher = "PLEIADES PUBLISHING INC",

number = "1",

}

RIS

TY - JOUR

T1 - Methane in Carbonate Melt Inclusions in the Rock-Forming Minerals of Calc-Silicate Rocks of the Kokchetav Massif

AU - Mikhno, A. O.

AU - Vinogradova, Yu G.

AU - Rashchenko, S. V.

AU - Korsakov, A. V.

N1 - This study was supported by the Russian Science Foundation, project no. 22-27-00667, https://rscf.ru/project/22-27-00667/ . Fieldwork and sampling were also supported by the Russian Science Foundation, project no. 18-17-00186.

PY - 2023/1

Y1 - 2023/1

N2 - Secondary inclusions of the carbonate melt in garnets and clinopyroxenes from ultrahigh-pressure calc-silicate rocks were studied. Secondary carbonate inclusions are located in the healed cracks confined to large (100 µm–3 mm) primary carbonate inclusions in garnet. In some cases, the healed cracks form plates that intersect both garnet and inclusions of potassium-bearing clinopyroxene in garnet. The high content of K2O (0.64 wt %) in the healed cracks in clinopyroxene inclusions suggests that their formation and healing took place during the stage of ultrahigh pressures. Interpretation of the Raman spectra of the secondary inclusions of the carbonate melt in garnet and clinopyroxene confirmed the presence of the following phases: methane, graphite, calcite, dolomite, muscovite, and phlogopite. The data obtained allowed us to recognize the stage of ultrahigh pressure metamorphism in the calc–silicate rocks of the Kokchetav massif, during which methane accumulation in the carbonate melt took place, for the first time.

AB - Secondary inclusions of the carbonate melt in garnets and clinopyroxenes from ultrahigh-pressure calc-silicate rocks were studied. Secondary carbonate inclusions are located in the healed cracks confined to large (100 µm–3 mm) primary carbonate inclusions in garnet. In some cases, the healed cracks form plates that intersect both garnet and inclusions of potassium-bearing clinopyroxene in garnet. The high content of K2O (0.64 wt %) in the healed cracks in clinopyroxene inclusions suggests that their formation and healing took place during the stage of ultrahigh pressures. Interpretation of the Raman spectra of the secondary inclusions of the carbonate melt in garnet and clinopyroxene confirmed the presence of the following phases: methane, graphite, calcite, dolomite, muscovite, and phlogopite. The data obtained allowed us to recognize the stage of ultrahigh pressure metamorphism in the calc–silicate rocks of the Kokchetav massif, during which methane accumulation in the carbonate melt took place, for the first time.

KW - metacarbonates

KW - methane

KW - partial melting

KW - subduction

KW - ultrahigh pressure metamorphism

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85159940988&origin=inward&txGid=d5baf5dc4f7534618618525a81ff1bae

UR - https://www.mendeley.com/catalogue/2bac099a-28c3-3de8-b7ed-de1d1b374c00/

U2 - 10.1134/S1028334X22601882

DO - 10.1134/S1028334X22601882

M3 - Article

VL - 508

SP - 6

EP - 11

JO - Doklady Earth Sciences

JF - Doklady Earth Sciences

SN - 1028-334X

IS - 1

ER -

ID: 56547796