georesГеоресурсыGeoresources1608-50431608-5078Georesursy LLC10.18599/grs.2021.4.10geores-167Research ArticleГЕОЛОГИЧЕСКИЕ, ГЕОХИМИЧЕСКИЕ И ГЕОФИЗИЧЕСКИЕ ИССЛЕДОВАНИЯК вопросу о дифференциации расплава в промежуточной камере (на примере дифференцированных интрузивов западного склона Южного Урала)On the melt differentiation in the intermediate chamber (by the example of differentiated intrusives of the western slope of the Southern Urals)КовалевС. Г.KovalevS. G.

Сергей Григорьевич Ковалев – доктор геол.-мин. наук, директор

450077, Уфа, ул. К. Маркса, д. 16/2

Sergey G. Kovalev – Director, DSc (Geology and Mineralogy)

16/2 Karl Marx st., Ufa, 450077

kovalev@ufaras.ruКовалевС. С.KovalevS. S.

Сергей Сергеевич Ковалев – научный сотрудник

450077, Уфа, ул. К. Маркса, д. 16/2

Sergey S. Kovalev – Junior Researcher

16/2 Karl Marx st., Ufa, 450077

Институт геологии УФИЦ РАНРоссияInstitute of Geology – Subdivision of the Ufa Federal Research Centre of the Russian Academy of SciencesRussian Federation2021140420242348095Copyright © Ковалев С.Г., Ковалев С.С., 20242024Ковалев С.Г., Ковалев С.С.Kovalev S.G., Kovalev S.S.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.geors.ru/jour/article/view/167

В статье приводятся материалы по анализу химического состава силикатов и алюмосиликатов, слагающих дифференцированное тело мисаелгинского комплекса, которые позволили расчетными методами восстановить термобарические параметры кристаллизации расплава в промежуточной камере.Установлено наличие высокотемпературных (1472 ºС) интрателлурических кристаллов оливина, характеризующих процесс магмогенерации в мантии и оливина, кристаллизующегося в условиях промежуточной камеры (1050–1183 ºС). Рассчитанная температура кристаллизации пироксенов свидетельствует о том, что они кристаллизовались совместно с оливином основной массы пород, а установленные вариации Р–Т параметров (Т = 950–1045ºС, Р = 4.0–7.4 кбар) для плагиоклаза и амфибола завершают количественную характеристику высокотемпературных процессов кристаллизации расплава.Показано, что рассчитанные Р–Т параметры кристаллизации расплава, сформировавшего интрузивный массив, позволяют отнести его ультраосновной горизонт к пикритовым комплексам второго типа, выделенным нами ранее.Моделирование процесса кристаллизации осуществленное с использованием двух моделей – по алгоритму Х.Д. Натана и К.К. Ван-Кирка и программному продукту КОМАГМАТ, позволили установить, что наиболее вероятным механизмом формирования дифференцированного тела мисаелгинского комплекса являлась направленная кристаллизация с гравитационным осаждением оливина на начальных стадиях процесса становления массива.

The article provides materials on the analysis of the chemical composition of silicates and aluminosilicates that make up the differentiated body of the Misaelga complex, which made it possible by calculation methods to restore the thermobaric parameters of crystallization of the melt in the intermediate chamberThe presence of high-temperature (1472 ºC) intratelluric olivine crystals characterizing the process of magma generation in the mantle and olivine crystallizing under the conditions of the intermediate chamber (1050–1183 ºC) has been established. The calculated crystallization temperature of pyroxenes indicates that they crystallized together with olivine from the bulk of the rocks, and the established variations in the P–T parameters (T = 950–1045 ºC, P = 4.0–7.4 kbar) for plagioclase and amphibole complete the quantitative characteristics of high-temperature melt crystallization processes.It is shown that the calculated Р–Т parameters of the crystallization of the melt that formed the intrusive massif make it possible to classify its ultrabasic horizon as picrite complexes of the second type that we identified earlier.Modeling of the crystallization process carried out using two models – according to the algorithm of H.D. Nathan and K.K. Van Kirk and the software product KOMAGMAT – made it possible to establish that the most probable mechanism for the formation of a differentiated body of the Misaelga complex was directional crystallization with gravitational deposition of olivine at the initial stages of the formation of the massif.

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