gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2020-11-1-0466gtcrust-988Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSДВЕ СТАДИИ МЕТАМОРФИЗМА В ПОРОДАХ ВОСТОЧНОЙ ЧАСТИ КИТОЙСКОГО БЛОКА (ШАРЫЖАЛГАЙСКИЙ ВЫСТУП СИБИРСКОЙ ПЛАТФОРМЫ) ПО ДАННЫМ ИЗУЧЕНИЯ ГРАНАТОВЫХ АМФИБОЛИТОВTWO EPISODES OF METAMORPHISM IN THE ROCKS OF THE EASTERN KITOI BLOCK (SHARYZHALGAI UPLIFT OF THE SIBERIAN PLATFORM) ACCORDING TO THE GARNET AMPHIBOLITE DATAhttps://orcid.org/0000-0002-6658-2360СухоруковВ. П.SukhorukovV. P.

ВАСИЛИЙ ПЕТРОВИЧ СУХОРУКОВ канд. геол.-мин. наук, с.н.с.

630090, г. Новосибирск, пр-т ак. Коптюга, 3, Россия

VASILIY P. SUKHORUKOV Candidate of Geology and Mineralogy, Senior Researcher

3 Academician Koptyug Ave, Novosibirsk 630090, Russia

svp@igm.nsc.ruСавельеваВ. Б.Savel'evaV. B.

ВАЛЕНТИНА БОРИСОВНА САВЕЛЬЕВА канд. геол.-мин. наук, с.н.с.

664033, г. Иркутск, ул. Лермонтова, 128, Россия

VALENTINA B. SAVEL'EVA Candidate of Geology and Mineralogy, Senior Researcher

128 Lermontov St, Irkutsk 664033, Russia

vsavel@crust.irk.ruИнститут геологии и минералогии им. В.С. Соболева СО РАН; Новосибирский национальный исследовательский государственный университетРоссияV.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of RAS; Novosibirsk State UniversityRussian FederationИнститут земной коры СО РАНРоссияInstitute of the Earth’s Crust, Siberian Branch of RASRussian Federation202019032020111107121Copyright © Сухоруков В.П., Савельева В.Б., 20202020Сухоруков В.П., Савельева В.Б.Sukhorukov V.P., Savel'eva V.B.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/988

Свидетельства архейского метаморфизма на ЮЗ Сибирского кратона установлены в Китойском и Иркутном блоках, однако параметры процесса метаморфизма до сих пор остаются слабоизученными. В работе приводятся первые результаты изучения условий метаморфизма гранатовых амфиболитов, отобранных в районе Китойского силлиманитового месторождения. На основании изучения реакционных взаимоотношений минералов установлено, что породы подверглись двум эпизодам метаморфизма. Первый эпизод регионального метаморфизма с РТ-параметрами Т=710–770 °С и Р=8.3–8.8 кбар завершился снижением давления на регрессивной стадии до параметров Р=1.3–2.5 кбар при Т=700 °С. При этом происходило образование амфибол-плагиоклазовых кайм вокруг зерен граната. Второй эпизод метаморфизма характеризовался температурами, достигающими гранулитовой фации (Т=890 °С) и формированием парагенезиса Cpx+Opx, замещающего роговую обманку. Второй эпизод метаморфизма проявлен не во всех образцах (при одинаковом валовом составе пород), что позволяет предположить его локальный характер.

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.

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The authors declare that there are no conflicts of interest present.