U–Pb Age and Mineral Inclusions in Zircon from Diamondiferous Garnet–Pyroxene Rocks of the Kumdy-Kol Microdiamond Deposit in Northern Kazakhstan

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U–Pb Age and Mineral Inclusions in Zircon from Diamondiferous Garnet–Pyroxene Rocks of the Kumdy-Kol Microdiamond Deposit in Northern Kazakhstan. / Ilyin, Andrei A.; Shatsky, V. S.; Ragozin, A. L.

In: Russian Geology and Geophysics, Vol. 65, No. 5, 05.2024, p. 579-593.

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

BibTeX

@article{38cd24e0575e49299d0aae90e32b4ff8,

title = "U–Pb Age and Mineral Inclusions in Zircon from Diamondiferous Garnet–Pyroxene Rocks of the Kumdy-Kol Microdiamond Deposit in Northern Kazakhstan",

abstract = "This paper describes the results of studying inclusions and determining the U–Pb age in zircon from the diamondiferous garnet–pyroxene rock of the Kumdy-Kol metamorphogenic diamond deposit, located in the Kokchetav subduction-collision zone. The distribution of rare earth elements in garnet and clinopyroxene is used as a basis for estimating the equilibrium pressure (5.5 ± 0.3 GPa) and temperature (993 ± 24 °C), which correspond to the diamond stability field. The composition of mineral inclusions in zircon indicates its formation at both the progressive and the regressive stage of metamorphism. The concordia diagram shows that the figurative points of zircon lie on a discordia with an upper intersection at 1953 ± 139 Ma and a lower intersection at 512 ± 4 Ma. The main peak on the graph of the probability density distribution of zircon ages corresponds to an age of 519 Ma. The presence of grossular–almandine garnet inclusions in zircon confirms the previous assumption that the basement rocks of the Kokchetav massif act as protoliths of garnet–pyroxene rocks.",

keywords = "Kokchetav subduction-collision zone, U–Pb age, inclusions in zircon, ultra-high-pressure metamorphism",

author = "Ilyin, {Andrei A.} and Shatsky, {V. S.} and Ragozin, {A. L.}",

note = "The work was performed according to the state task of the IGM SB RAS (122041400159-3).",

year = "2024",

month = may,

doi = "10.2113/RGG20234661",

language = "English",

volume = "65",

pages = "579--593",

journal = "Russian Geology and Geophysics",

issn = "1068-7971",

publisher = "Elsevier Science B.V.",

number = "5",

}

RIS

TY - JOUR

T1 - U–Pb Age and Mineral Inclusions in Zircon from Diamondiferous Garnet–Pyroxene Rocks of the Kumdy-Kol Microdiamond Deposit in Northern Kazakhstan

AU - Ilyin, Andrei A.

AU - Shatsky, V. S.

AU - Ragozin, A. L.

N1 - The work was performed according to the state task of the IGM SB RAS (122041400159-3).

PY - 2024/5

Y1 - 2024/5

N2 - This paper describes the results of studying inclusions and determining the U–Pb age in zircon from the diamondiferous garnet–pyroxene rock of the Kumdy-Kol metamorphogenic diamond deposit, located in the Kokchetav subduction-collision zone. The distribution of rare earth elements in garnet and clinopyroxene is used as a basis for estimating the equilibrium pressure (5.5 ± 0.3 GPa) and temperature (993 ± 24 °C), which correspond to the diamond stability field. The composition of mineral inclusions in zircon indicates its formation at both the progressive and the regressive stage of metamorphism. The concordia diagram shows that the figurative points of zircon lie on a discordia with an upper intersection at 1953 ± 139 Ma and a lower intersection at 512 ± 4 Ma. The main peak on the graph of the probability density distribution of zircon ages corresponds to an age of 519 Ma. The presence of grossular–almandine garnet inclusions in zircon confirms the previous assumption that the basement rocks of the Kokchetav massif act as protoliths of garnet–pyroxene rocks.

AB - This paper describes the results of studying inclusions and determining the U–Pb age in zircon from the diamondiferous garnet–pyroxene rock of the Kumdy-Kol metamorphogenic diamond deposit, located in the Kokchetav subduction-collision zone. The distribution of rare earth elements in garnet and clinopyroxene is used as a basis for estimating the equilibrium pressure (5.5 ± 0.3 GPa) and temperature (993 ± 24 °C), which correspond to the diamond stability field. The composition of mineral inclusions in zircon indicates its formation at both the progressive and the regressive stage of metamorphism. The concordia diagram shows that the figurative points of zircon lie on a discordia with an upper intersection at 1953 ± 139 Ma and a lower intersection at 512 ± 4 Ma. The main peak on the graph of the probability density distribution of zircon ages corresponds to an age of 519 Ma. The presence of grossular–almandine garnet inclusions in zircon confirms the previous assumption that the basement rocks of the Kokchetav massif act as protoliths of garnet–pyroxene rocks.

KW - Kokchetav subduction-collision zone

KW - U–Pb age

KW - inclusions in zircon

KW - ultra-high-pressure metamorphism

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85193494089&origin=inward&txGid=0c9173e7b3cf625ffadc5b6ad553d715

UR - https://www.mendeley.com/catalogue/649cc99c-c971-3ac3-bd42-d9e9cc0eb723/

U2 - 10.2113/RGG20234661

DO - 10.2113/RGG20234661

M3 - Article

VL - 65

SP - 579

EP - 593

JO - Russian Geology and Geophysics

JF - Russian Geology and Geophysics

SN - 1068-7971

IS - 5

ER -

ID: 61043572