litosphereЛитосфераLITHOSPHERE (Russia)1681-90042500-302XA.N. Zavaritsky Institute of Geology and Geochemistry10.24930/1681-9004-2023-23-4-531-548litosphere-1930Research ArticleСтатьиArticlesИспользование рамановской спектроскопии для характеристики состава минеральных включений перидотитового парагенезиса в алмазахRaman Spectroscopy for Characterization of Peridotite Paragenesis Mineral Inclusions in DiamondsКалугинаА. Д.KaluginaA. D.

620110, Екатеринбург, ул. Академика Вонсовского, 15; 630090, Новосибирск, пр-т Академика Коптюга, 3

Anastasiya D. Kalugina.

15 Academician Vonsovsky st., Ekaterinburg 620110; 3 Academician Koptyug av., Novosibirsk 630090

anastaskalugina@gmail.comЗедгенизовД. А.ZedgenizovD. A.

620110, Екатеринбург, ул. Академика Вонсовского; 620144, Екатеринбург, ул. Куйбышева, 30

Dmitry A. Zedgenizov.

15 Academician Vonsovsky st., Ekaterinburg 620110; 30 Kuibyshev st., Ekaterinburg 620144

ЛогвиноваА. М.LogvinovaA. M.

630090, Новосибирск, пр-т Академика Коптюга, 3

Alla M. Logvinova.

3 Academician Koptyug av., Novosibirsk 630090

Институт геологии и геохимии им. академика А.Н. Заварицкого УРО РАН; Институт геологии и минералогии им. В.С. Соболева СО РАНРоссияA.N. Zavaritsky Institute of Geology and Geochemistry, UB RAS; V.S. Sobolev Institute of Geology and Mineralogy, SB RASRussian FederationИнститут геологии и геохимии им. академика А.Н. Заварицкого УРО РАН; Уральский государственный горный университетРоссияA.N. Zavaritsky Institute of Geology and Geochemistry, UB RAS; Ural State Mining UniversityRussian FederationИнститут геологии и минералогии им. В.С. Соболева СО РАНРоссияV.S. Sobolev Institute of Geology and Mineralogy, SB RASRussian Federation202308092023234531548Copyright © Калугина А.Д., Зедгенизов Д.А., Логвинова А.М., 20232023Калугина А.Д., Зедгенизов Д.А., Логвинова А.М.Kalugina A.D., Zedgenizov D.A., Logvinova A.M.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.lithosphere.ru/jour/article/view/1930

Объект исследования. Спектроскопические характеристики минералов мантийных перидотитов и создание неразрущающей методики экспрессной оценки химического состава минеральных включений в природных алмазах перидотитового парагенезиса с использованием данных рамановской спектроскопии. Материалы и методы. В работе были исследованы алмазы как с единичными минеральными включениями, так и с ассоциациями включений перидотитового парагенезиса (оливин, ортопироксен, клинопироксен, гранат) из разных месторождений Якутской алмазоносной провинции. Химический состав минеральных включений в алмазах определялся с помощью рентгеноспектрального микроанализа, рамановские спектры включений были получены на спектрометре, оснащенном Nd:YAG лазером с длиной волны 532 нм. Результаты. Спектроскопические характеристики минеральных включений в природных алмазах отражают особенности их химического состава: смещение положений рамановских пиков DB1 и DB2 в спектрах оливина демонстрирует изоморфизм форстерит-фаялит (Mg-Fe); изменение положений валентных колебательных мод в КР-спектрах клинопироксена Si-Onbr (ν16) и Si-Obr (ν11) и ортопироксена (ν17) отражает изоморфизм диопсид-жадеит (CaMg-NaAl) и энстатит-ферросилит (Mg-Fe), смещения положений деформационных (ν2) и валентных (ν1, ν3) мод колебательных энергий связи Si-O в гранатах отражают изоморфизм пар Al-Cr и Ca-Mg соответственно. Выводы. Выявленные корреляции были использованы при построении регрессионных линий, которые можно применять для количественного определения содержаний главных химических компонентов минеральных включений граната и клинопироксена перидотитового парагенезиса in situ в алмазах. Разработанная методика оценки химического состава включений граната и клинопироксенов потенциально может быть использована при разделении включений клинопироксенов и гранатов разных мантийных парагенезисов.

Research subject. Spectroscopic features (Raman spectra) of mineral inclusions of peridotite paragenesis (olivine, orthopyroxene, clinopyroxene, garnet) in natural diamonds of the Yakutian diamondiferous province. Materials and methods. A series of diamonds was studied both with single mineral inclusions and with associations of inclusions of peridotite paragenesis. The chemical composition of mineral inclusions in diamonds was determined using an electron probe micro-analyzer (EPMA). The Raman spectra of inclusions were obtained on a spectrometer equipped with a Nd:YAG laser with a wavelength of 532 nm. Results. The revealed spectroscopic characteristics of mineral inclusions in natural diamonds reflect specific features of their chemical composition. Thus, the shift in the positions of the Raman peaks DB1 and DB2 in the olivine spectra reflects the forsterite - fayalite (Mg-Fe) isomorphism; changes in the positions of valence vibrational modes in the Raman spectra of clinopyroxene Si-Onbr (ν16) and Si-Obr (ν11) and orthopyroxene (ν17) reflect the isomorphism of diopside - jadeite (CaMg-NaAl) and enstatite - ferrosilite (Mg-Fe), position shifts of deformation (ν2) and valence (ν1, ν3) modes of vibrational energies of the Si-O bond in garnets reflect the Al-Cr and Ca-Mg isomorphism, respectively. Conclusions. For the identified correlations, regression lines were calculated, which can be used to determine the quantitative contents of the main chemical components of mineral inclusions (clinopyroxene and garnet) of peridotite paragenesis in situ in diamonds. The developed method for evaluating the chemical composition of garnet and clinopyroxene inclusions can be used to distinguish clinopyroxene and garnet inclusions from different mantle parageneses.

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