References

gtcrust

Геодинамика и тектонофизика

Geodynamics & Tectonophysics

2078-502X

Institute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch

10.5800/GT-2024-15-5-0786

OAGAKW

gtcrust-1922

Research Article

ПАЛЕОГЕОДИНАМИКА

PALEOGEODYNAMICS

СОСТАВ СЛЮДЫ КАК ОТРАЖЕНИЕ УСЛОВИЙ ОБРАЗОВАНИЯ АЙЛИКИТОВ ЗИМИНСКОГО КОМПЛЕКСА (ВОСТОЧНАЯ СИБИРЬ)

MICA COMPOSITION REFLECTING CONDITIONS OF AILLIKITE FORMATION IN ZIMA COMPLEX OF EASTERN SIBERIA

https://orcid.org/0000-0002-9238-4763

Савельева

В. Б.

Savelyeva

V. B.

664033, Иркутск, ул. Лермонтова, 128

128 Lermontov St, Irkutsk 664033

vsavel@crust.irk.ru

https://orcid.org/0000-0002-6454-3552

Данилова

Ю. В.

Danilova

Yu. V.

664033, Иркутск, ул. Лермонтова, 128

128 Lermontov St, Irkutsk 664033

https://orcid.org/0000-0002-6644-2659

Базарова

Е. П.

Bazarova

E. P.

664033, Иркутск, ул. Лермонтова, 128

128 Lermontov St, Irkutsk 664033

https://orcid.org/0000-0002-3262-6636

Данилов

Б. С.

Danilov

B. S.

664033, Иркутск, ул. Лермонтова, 128

128 Lermontov St, Irkutsk 664033

https://orcid.org/0000-0001-6733-8282

Хромова

Е. А.

Khromova

E. A.

670047, Улан-Удэ, ул. Сахьяновой, 6а, Республика Бурятия

6а Sakhyanova St, Ulan-Ude 670047, Republic of Buryatia

Институт земной коры СО РАНРоссияInstitute of the Earth’s Crust, Siberian Branch of the Russian Academy of SciencesRussian Federation

Геологический институт им. Н.Л. Добрецова СО РАНРоссияDobretsov Geological Institute, Siberian Branch of the Russian Academy of SciencesRussian Federation

2024

18102024

155786786

2024

Савельева В.Б., Данилова Ю.В., Базарова Е.П., Данилов Б.С., Хромова Е.А.

Savelyeva V.B., Danilova Y.V., Bazarova E.P., Danilov B.S., Khromova E.A.

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/1922

В макрокристовых и мелкопорфировых айликитах из Ярминской зоны Урикско-Ийского грабена по особенностям морфологии, химического состава, зональности и условий кристаллизации выделены четыре типа слюды. Слюда первого типа присутствует в макрокристовых айликитах, где представлена деформированными макрокристаллами богатого TiO2 (2.5–5.7 мас. %) флогопита с варьирующимся содержанием Cr2O3 (от ниже предела обнаружения до 2.0 мас. %) и магнезиальностью (Mg# 0.87–0.89 и 0.79–0.81 в разных дайках). По химическому составу этот флогопит соответствует вторичному флогопиту из мантийных ксенолитов и, вероятно, был захвачен протоайликитовым расплавом из пород литосферной мантии. Слюда второго типа представлена флогопитом из основной массы и более редких вкрапленников в мелкопорфировых айликитах и основной массы макрокристовых айликитов. Содержание TiO2 в этом флогопите варьируется в разных дайках от 0.7 до 6.0 мас. %, магнезиальность Mg# – от 0.70 до 0.90. Кристаллизация флогопита происходила в условиях верхней коры в диапазоне от 840 до 680 °С. Слюда третьего типа представлена биотитом (Mg# 0.40–0.65), образующим каймы вокруг флогопита и самостоятельные зерна в мелкопорфировых и, редко, в макрокристовых айликитах. Каймы кристаллизовались из остаточного обогащенного железом расплава при умеренно повышенной fO2, температура образования биотита составляла 700‒760 °C. Слюда четвертого типа присутствует в макрокристовых айликитах и представлена биотитом (Mg# 0.40‒0.67) с каймами флогопита. Предполагается, что этот биотит кристаллизовался в промежуточных магматических камерах в верхней коре из существенно карбонатных расплавов, отделившихся в процессе кристаллизационной дифференциации от протоайликитовых магм, и был захвачен новыми порциями менее дифференцированных расплавов. Полученные данные указывают на предшествующее выплавлению протоайликитовых расплавов метасоматическое преобразование литосферной мантии под южной окраиной Сибирского кратона и позволяют предполагать существование в верхней коре участков, выполненных частично закристаллизованным расплавом.

Four types of mica were identified in the macrocryst and fine porphyry aillikites from the Yarma zone of the Urik-Ija graben considering specific features of morphology, chemical composition, zonation and crystallization conditions. Mica of the first type was found in macrocryst aillikites. It is available as deformed phlogopite macrocrysts rich in TiO2 (2.5–5.7 wt. %) with varying content of Cr2O3 (from detection limit to 2.0 wt. %) and Mg# 0.87–0.89 and 0.79–0.81 in different dikes. In chemical composition this phlogopite corresponds to the secondary phlogopite from mantle xenoliths, and it was obviously captured by protoaillikite melt form the rocks of the lithosphere mantle. Mica of type 2 represents phlogopite from groundmass and infrequent phenocrysts in fine porphyry aillikites and groundmass of macrocryst aillikites. In this phlogopite, TiO2 content varies in different dikes from 0.7 to 6.0 wt. %, Mg# index varies from 0.70 to 0.90. Phlogopite crystallized within the upper crust at temperature ranging from 840 to 680 °С. Mica of type 3 represents biotite (Mg# 0.40–0.65), producing rims around phlogopite and independent grains in fine porphyry and in places in macrocryst aillikites. The rims crystallized from residual Fe-rich melt at moderately heightened fO2, the temperature of biotite formation reached 700‒760 °C. Mica of type 4 is available in macrocryst aillikites as biotite (Mg# 0.40‒0.67) with phlogopite rims. It was inferred, that this biotite crystallized in intermediate magmatic chambers in the upper crust from essentially carbonate melts, separated through crystallization differentiation from protoaillikite magmas and captured by new portions of less differentiated melts. Obtained data point to metasomatic transformation of the lithosphere mantle, preceding to protoaillikite melting, under the southern margin of the Siberian craton. Thus, we may assume existence in the upper crust of the sites composed of partially crystallized melt.

флогопитантекристаллыультрамафические лампрофирыкарбонатитызиминский комплексУрикско-Ийский грабенСибирский кратон

phlogopiteantecrystalsultramafic lamprophyrescarbonatitesZima complexUrik-Ija grabenSiberian craton

Работа выполнена при финансовой поддержке РНФ (проект 23-17-00196). При выполнении работы задействовалось оборудование ЦКП «Геодинамика и геохронология» Института земной коры СО РАН в рамках гранта № 075‒15‒2021‒682. Изучение химического состава минералов выполнено в рамках государственного задания ГИН СО РАН по проекту АААА‒А21‒121011390002‒2.

This work was performed with financial support from the Russian Science Foundation, grant 23-17-00196. The authors employed the equipment of the Center for Geodynamics and Geochronology at the Institute of the Earth’s Crust SB RAS, grant 075‒15‒2021‒682. Chemical composition of minerals was determined at the Dobretsov Geological Institute SB RAS, project АААА‒А21‒121011390002‒2.

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