gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2022-13-4-0655gtcrust-1550Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSРАСПЛАВНЫЕ ВКЛЮЧЕНИЯ В ОЛИВИНЕ КАК ИСТОЧНИК ИНФОРМАЦИИ О СОСТАВЕ И ЭВОЛЮЦИИ ГЛУБИННЫХ РАСПЛАВОВ АЙЛИКИТОВ (УЛЬТРАОСНОВНЫХ ЛАМПРОФИРОВ) ИЛЬБОКИЧСКОГО ПОДНЯТИЯ ЮЗ СИБИРСКОЙ ПЛАТФОРМЫMELT INCLUSIONS IN OLIVINE AS A SOURCE OF INFORMATION ON THE COMPOSITION AND EVOLUTION OF DEEP MELTS OF AILLIKITES (ULTRAMAFIC LAMPROPHYRES) OF THE ILBOKICHI UPLIFT, THE SW SIBERIAN PLATFORMСтариковаА. Е.StarikovaA. Е.

630090, Новосибирск, пр-т Академика Коптюга, 3

630090, Новосибирск, ул. Пирогова, 1

3 Academician Koptyug Ave, Novosibirsk 630090

1 Pirogov St, Novosibirsk 630090

ПрокопьевИ. Р.ProkopyevI. R.

630090, Новосибирск, пр-т Академика Коптюга, 3

630090, Новосибирск, ул. Пирогова, 1

3 Academician Koptyug Ave, Novosibirsk 630090

1 Pirogov St, Novosibirsk 630090

ДорошкевичА. Г.DoroshkevichA. G.

630090, Новосибирск, пр-т Академика Коптюга, 3

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

3 Academician Koptyug Ave, Novosibirsk 630090

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

КаргинА. В.KarginA. V.

119017, Москва, пер. Старомонетный, 35

35 Staromonetny Ln, Moscow 119017

НосоваА. А.NosovaA. A.

119017, Москва, пер. Старомонетный, 35

35 Staromonetny Ln, Moscow 119017

КовалевС. А.KovalevS. A.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

Институт геологии и минералогии им. В.С. Соболева СО РАН; Новосибирский государственный университетРоссияSobolev Institute of Geology and Mineralogy; Novosibirsk State UniversityRussian FederationИнститут геологии и минералогии им. В.С. Соболева СО РАН; Геологический институт им. Н.Л. Добрецова СО РАНРоссияSobolev Institute of Geology and Mineralogy; Dobretsov Geological Institute, Siberian Branch of the Russian Academy of SciencesRussian FederationИнститут геологии рудных месторождений, петрографии, минералогии и геохимии РАНРоссияInstitute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Russian Academy of SciencesRussian FederationИнститут геологии и минералогии им. В.С. Соболева СО РАНРоссияSobolev Institute of Geology and MineralogyRussian Federation202212102022134655655Copyright © Старикова А.Е., Прокопьев И.Р., Дорошкевич А.Г., Каргин А.В., Носова А.А., Ковалев С.А., 20222022Старикова А.Е., Прокопьев И.Р., Дорошкевич А.Г., Каргин А.В., Носова А.А., Ковалев С.А.Starikova A.Е., Prokopyev I.R., Doroshkevich A.G., Kargin A.V., Nosova A.A., Kovalev S.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/1550

Айликиты – кимберлитоподобные породы – важны для понимания состава и процессов, происходящих в мантии. И одним из наиболее надежных источников информации являются расплавные включения. В статье представлены первые результаты исследований (КР-спектроскопия, ЭДС) первичных и вторичных расплавных включений в оливинах из айликитов Ильбокичского поднятия. Состав первичных включений наиболее близок к материнскому расплаву айликитов. Он существенно обогащен CO2, H2O, фосфором и титаном. В этих включениях диагностированы флогопит, диопсид, доломит, кальцит, апатит, Ti-содержащие фазы (брукит, перовскит, Ti-магнетит) и лизардит. Схожесть состава и соотношений дочерних фаз с основной массой айликитов указывает на слабое изменение материнского расплава при подъеме его на поверхность. Для вторичных включений отмечаются широкие вариации составов и меньшая доля силикатов по сравнению с первичными. Основными дочерними фазами являются карбонаты: доломит, кальцит, магнезит и щелочные карбонаты. Кроме того, диагностировались флогопит, клинопироксен, апатит, галит, пирротин и магнетит, графит и CO2. Непостоянство составов вторичных включений может быть связано с появлением силикатно-карбонатной несмесимости в процессе подъема айликитового расплава при давлении ≤4 ГПа.

Aillikites are kimberlite-like rocks, important for understanding the composition and processes occurring in the mantle. Melt inclusions represent a reliable source of information. The paper provides the first results of studies (Raman, EDS) on primary and secondary melt inclusions in olivine from the Ilbokich uplift aillikites. The composition of primary inclusions is close to that of parent melt of aillikites. It was significantly enriched in CO2, H2O, phosphorus and titanium. Phlogopite, diopside, dolomite, calcite, apatite, Ti-containing phases (brookite, perovskite, Ti-magnetite) and lizardite were identified in these inclusions. The similarity of the composition and ratios of the daughter phases with the aillikite matrix indicates a slight change in the parent melt when it is rising to the surface. As to the secondary inclusions, there are wide variations in compositions and a smaller amount of silicates, as compared to the primary ones. The main daughter phases are carbonates, e.g. dolomite, calcite, magnesite and alkaline carbonates. In addition, phlogopite, clinopyroxene, apatite, halite, pyrrhotite and magnetite, graphite and CO2 were discovered. The variability of the compositions of the secondary inclusions might be due to the silicate-carbonate immiscibility that appeared during the rising of the aillikite melt at pressures <4 GPa.

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