Raman Identification of Inclusions in Diamond

Smith, Evan M.; Krebs, Mandy Y.; Genzel, P. T.; Brenker, Frank E.

doi:10.2138/rmg.2022.88.08

Cited by 12 publications

(2 citation statements)

References 123 publications

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“…Коэсит является типичным минералом эклогитового парагенезиса (Соболев, 2006) и свидетельствует о субдукционной природе протолита (например, Jacob, 2004). Вместе с коэситом диагностированы другие типичные (гроссуляр-альмандиновый гранат, Na-клинопироксен, рутил, кианит, карбонаты) и экзотические (оливин, ортопироксен, Cr-пироп) минеральные включения в кристаллах алмаза (Smith et al, 2022).…”

Section: Introductionunclassified

Минералогия Включений В Коэсит-Содержащих Алмазах По Данным Кр-Картирования

А.О.,

А.М.,

Д.С.

2023

Труды ФНС

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Аннотация. Методом конфокальной спектроскопии комбинационного рассеяния света (КР-спектроскопия) были изучены пять минеральных включений в кристаллах алмаза. Среди этих минеральных включений три являются коэситом, который характеризуется хорошей сохранностью и отсутствием видимых трещин вокруг. Согласно КР-спектроскопии, эти включения имеют значительное смещение основного пика (520.6 см -1 ) в более высокочастотную область. Расчет остаточного давления для этих включений показал диапазон от 3.2 до 4.3 ГПа. Кроме того, были изучены два полифазных включения, которые представлены срастаниями: 1) Na-клинопироксена и не идентифицированного минерала (основные пики 220 и 284 см -1 ); 2) карбоната, анатаза и санидина. Полученные нами предварительные результаты указывают на важную роль карбонатов при кристаллизации алмазов.

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Section: Introductionunclassified

Минералогия Включений В Коэсит-Содержащих Алмазах По Данным Кр-Картирования

А.О.,

А.М.,

Д.С.

2023

Труды ФНС

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“…Numerous studies of melt/fluid micro-and nano-inclusions in lithospheric fibrous diamonds the world over (e.g., [27][28][29][30][31][32][33][34][35]), including cuboid-type diamonds from the V. Grib kimberlite pipe [36], indicate a significant role of local carbonate/alkaline-carbonate melts/fluids in the formation of these diamonds. Crystalline inclusions of carbonates in lithospheric diamonds are mainly calcite, magnesite and dolomite, which are considered rare compared with inclusions of silicate minerals (e.g., reviews in [37,38]). However, the volume of mineralogical data on carbonate mineral inclusions in lithospheric diamonds is constantly increasing.…”

Section: Introductionmentioning

confidence: 99%

Mineral Assemblage of Olivine-Hosted Melt Inclusions in a Mantle Xenolith from the V. Grib Kimberlite Pipe: Direct Evidence for the Presence of an Alkali-Rich Carbonate Melt in the Mantle Beneath the Baltic Super-Craton

2023

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This report deals with the first mineralogical examination of secondary crystallized melt inclusions (CMIs) in healed cracks within olivine in a mantle peridotite xenolith from the V. Grib kimberlite pipe (Arkhangelsk diamondiferous province). In contrast to micro/nano-inclusions in diamonds, the studied CMIs are quite large (up to 50 µm), so that the mineral composition of the CMIs can be determined via conventional analytical approaches, e.g., Raman spectroscopy and scanning electron microscopy. Garnet peridotite is a coarse-grained mantle rock that equilibrates at 3.3 GPa and 750 °C (corresponding to a depth of ~100 km). The CMIs are therefore tiny snapshots of melt that existed in the shallow lithospheric mantle and were entrapped in olivine. In total, nineteen mineral species were identified among the daughter magmatic minerals of the CMIs. Various Na-K-Ca-, Na-Ca, Na-Mg-, Ca-Mg-, Mg- and Ca-carbonates; Na-Mg-carbonates with the additional anions Cl−, SO42− and PO43−; alkali sulfates; chlorides; phosphates; sulfides; oxides; and silicates were established. Within the mineral assemblage, carbonates were predominant, with their abundance being more than 62 vol.%. The CMIs contained twelve alkali-rich minerals; nine of them were Na-bearing and showed bulk molar (Na + K)/Ca ≥ 1. The CMIs’ parental melt was an alkali-rich carbonate liquid that contained low amounts of SiO2 (≤9.6 wt%) and H2O (≤2.6 wt%). According to our estimates, the time of complete equilibration between olivine within the healed cracks and host olivine in the mantle at the calculated P-T parameters for the studied xenolith should be no more than several years. Based on this geologically short time span, a genetic link between the studied CMIs and the magmatism that formed the V. Grib kimberlite pipe is suggested.

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Imperfections in natural diamond: the key to understanding diamond genesis and the mantle

Day,

Pamato,

Novella

et al. 2023

Riv. Nuovo Cim.

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Diamond has unique physical, thermal, electrical, and optical properties with respect to other minerals and related synthetic compounds that make it extremely valuable from an economic and industrial perspective. Natural diamond that forms in the upper mantle, transition zone, and lower mantle may encapsulate mantle minerals during growth and protect them from physical breakdown and chemical alteration upon ascent of the diamond to the surface via kimberlite eruption. Such mineral inclusions serve as the only direct means to study the deep Earth and provide critical information about the pressure, temperature, and redox conditions and the chemical and isotopic composition of the mantle. Natural diamonds show a wide range of ages and thus allow one to reconstruct the history of large-scale Earth processes, such as the formation and amalgamation of Earth’s lithosphere, the onset and evolution of tectonic processes (e.g., Wilson cycles), and the recycling of C, H, and N between different primordial and crustal reservoirs. In this review, a detailed description of all types of imperfections (e.g., mineral and fluid inclusions and structural defects) and the methods by which such imperfections can be analyzed to elucidate aspects of Earth’s complex geologic history is given.

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Raman Identification of Inclusions in Diamond

Cited by 12 publications

References 123 publications

Минералогия Включений В Коэсит-Содержащих Алмазах По Данным Кр-Картирования

Минералогия Включений В Коэсит-Содержащих Алмазах По Данным Кр-Картирования

Mineral Assemblage of Olivine-Hosted Melt Inclusions in a Mantle Xenolith from the V. Grib Kimberlite Pipe: Direct Evidence for the Presence of an Alkali-Rich Carbonate Melt in the Mantle Beneath the Baltic Super-Craton

Imperfections in natural diamond: the key to understanding diamond genesis and the mantle

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