Two episodes of metamorphism in the rocks of the eastern Kitoi block (Sharyzhalgai uplift of the Siberian platform) according to the Garnet amphibolite data

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Two episodes of metamorphism in the rocks of the eastern Kitoi block (Sharyzhalgai uplift of the Siberian platform) according to the Garnet amphibolite data. / Sukhorukov, V. P.; Savel'eva, V. B.

In: Geodynamics and Tectonophysics, Vol. 11, No. 1, 01.01.2020, p. 107-121.

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

BibTeX

@article{e5d9592b6ba64d2b88fde37c6e680fe0,

title = "Two episodes of metamorphism in the rocks of the eastern Kitoi block (Sharyzhalgai uplift of the Siberian platform) according to the Garnet amphibolite data",

abstract = "The Archean metamorphism in the southwestern Siberian craton was confirmed by the studies of the Kitoy and Irkutsk blocks. However, the parameters of the metamorphism process are still poorly investigated. The article presents the first results of studying the metamorphism conditions of garnet amphibolites sampled from the Kitoy sillimanite deposit. The reaction relationships of the studied minerals give grounds to distinguish two episodes of the regional metamorphism. At the end of the first episode, (Т=710-770 °С and Р=8.3-8.8 kb), the pressure reduced to 1.3-2.5 kbar at T=700 °C at the retrograde stage, and amphibole-plagioclase rims formed around garnet grains. During the second episode of metamorphism, the temperature reached 890 °С (granulite facies), and Cpx+Opx paragenesis replaced hornblende. The second episode of metamorphism is not evident in all the samples (considering the same bulk rocks composition of the rocks), which suggests its local character.",

keywords = "Amphibolite, Archean, Granulite metamorphism, Kitoy block, P-T path of metamorphism, PT-parameters, Siberian craton, Siberian craton, Kitoy block, Archean, granulite metamorphism, amphibolite, PT-parameters, P-T path of metamorphism, SILLIMANITE SCHIST DEPOSIT, IRKUT BLOCK, RICH GRANULITES, CRATON, TEMPERATURE, AGE, EVOLUTION, COMPLEX, CALIBRATION, THERMOBAROMETRY",

author = "Sukhorukov, {V. P.} and Savel'eva, {V. B.}",

note = "Сухоруков В.П., Савельева В.Б. Две стадии метаморфизма в породах восточной части Китойского блока (Шарыжалгайский выступ Сибирской платформы) по данным изучения гранатовых амфиболитов // Геодинамика и тектонофизика. - 2020. - Т. 11. - № 1. - С. 107-121",

year = "2020",

month = jan,

day = "1",

doi = "10.5800/GT-2020-11-1-0466",

language = "English",

volume = "11",

pages = "107--121",

journal = "Geodynamics and Tectonophysics",

issn = "2078-502X",

publisher = "Institute of the Earth's Crust",

number = "1",

}

RIS

TY - JOUR

T1 - Two episodes of metamorphism in the rocks of the eastern Kitoi block (Sharyzhalgai uplift of the Siberian platform) according to the Garnet amphibolite data

AU - Sukhorukov, V. P.

AU - Savel'eva, V. B.

N1 - Сухоруков В.П., Савельева В.Б. Две стадии метаморфизма в породах восточной части Китойского блока (Шарыжалгайский выступ Сибирской платформы) по данным изучения гранатовых амфиболитов // Геодинамика и тектонофизика. - 2020. - Т. 11. - № 1. - С. 107-121

PY - 2020/1/1

Y1 - 2020/1/1

N2 - The Archean metamorphism in the southwestern Siberian craton was confirmed by the studies of the Kitoy and Irkutsk blocks. However, the parameters of the metamorphism process are still poorly investigated. The article presents the first results of studying the metamorphism conditions of garnet amphibolites sampled from the Kitoy sillimanite deposit. The reaction relationships of the studied minerals give grounds to distinguish two episodes of the regional metamorphism. At the end of the first episode, (Т=710-770 °С and Р=8.3-8.8 kb), the pressure reduced to 1.3-2.5 kbar at T=700 °C at the retrograde stage, and amphibole-plagioclase rims formed around garnet grains. During the second episode of metamorphism, the temperature reached 890 °С (granulite facies), and Cpx+Opx paragenesis replaced hornblende. The second episode of metamorphism is not evident in all the samples (considering the same bulk rocks composition of the rocks), which suggests its local character.

AB - The Archean metamorphism in the southwestern Siberian craton was confirmed by the studies of the Kitoy and Irkutsk blocks. However, the parameters of the metamorphism process are still poorly investigated. The article presents the first results of studying the metamorphism conditions of garnet amphibolites sampled from the Kitoy sillimanite deposit. The reaction relationships of the studied minerals give grounds to distinguish two episodes of the regional metamorphism. At the end of the first episode, (Т=710-770 °С and Р=8.3-8.8 kb), the pressure reduced to 1.3-2.5 kbar at T=700 °C at the retrograde stage, and amphibole-plagioclase rims formed around garnet grains. During the second episode of metamorphism, the temperature reached 890 °С (granulite facies), and Cpx+Opx paragenesis replaced hornblende. The second episode of metamorphism is not evident in all the samples (considering the same bulk rocks composition of the rocks), which suggests its local character.

KW - Amphibolite

KW - Archean

KW - Granulite metamorphism

KW - Kitoy block

KW - P-T path of metamorphism

KW - PT-parameters

KW - Siberian craton

KW - Kitoy block

KW - Archean

KW - granulite metamorphism

KW - amphibolite

KW - PT-parameters

KW - P-T path of metamorphism

KW - SILLIMANITE SCHIST DEPOSIT

KW - IRKUT BLOCK

KW - RICH GRANULITES

KW - CRATON

KW - TEMPERATURE

KW - AGE

KW - EVOLUTION

KW - COMPLEX

KW - CALIBRATION

KW - THERMOBAROMETRY

UR - http://www.scopus.com/inward/record.url?scp=85086125656&partnerID=8YFLogxK

UR - https://www.elibrary.ru/item.asp?id=42656259

U2 - 10.5800/GT-2020-11-1-0466

DO - 10.5800/GT-2020-11-1-0466

M3 - Article

AN - SCOPUS:85086125656

VL - 11

SP - 107

EP - 121

JO - Geodynamics and Tectonophysics

JF - Geodynamics and Tectonophysics

SN - 2078-502X

IS - 1

ER -

ID: 24517850