Petrogenesis of autoliths from kimberlitic breccias in the V. Grib Pipe (Arkhangelsk district)

Golubeva, Yu. Yu.; Pervov, V. A.; Kononova, V. A.

doi:10.1134/s1028334x06080228

Cited by 11 publications

(2 citation statements)

References 3 publications

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“…В. Гриба, эти породы содержат от 10 до 12 мас. % H 2 O (Golubeva et al, 2006), что более чем в 100 раз превышает, концентрацию воды в расплаве из которого сформировались кимберлиты данной трубки. Кроме того, щелочесодержащие карбонаты, сульфаты и хлориды, присутствующие в расплавных включениях, не идентифицированы в основной массе этих кимберлитов.…”

Section: обсуждение результатовunclassified

Клинопироксены Из Щелочных И Силикатно-Карбонатных Пород Чикского Массива (Сангиленское Нагорье, Тыва)

Поляков,

Никифоров,

Хертек

2023

Щелочной И Кимберлитовый Магматизм Земли И Связанные С Ним Месторождения Стратегических Металлов И Алмазов.

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Организационный комитет международной научной конференции "Щелочной и кимберлитовый магматизм земли и связанные с ним месторождения стратегических металлов и алмазов" Председатель •академик РАН Кривовичев Сергей Владимирович (ФИЦ КНЦ РАН, г. Апатиты) Сопредседатели •академик РАН Когарко Лия Николаевна (ГЕОХИ РАН, г. Москва) •д.г.-м.н. Козлов Николай Евгеньевич (ГИ КНЦ РАН, г. Апатиты

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Section: обсуждение результатовunclassified

Клинопироксены Из Щелочных И Силикатно-Карбонатных Пород Чикского Массива (Сангиленское Нагорье, Тыва)

Поляков,

Никифоров,

Хертек

2023

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“…The comprehensive data on the ADP magmatic bodies, including location, morphology, size, structure and composition, can be found in [92,97,98]. The detailed petrographic and geochemical data of the V. Grib kimberlites are presented in [95,96,99]. The studied sample, G1-25, is protogranular garnet peridotite.…”

Section: Geological Background and Sample Descriptionmentioning

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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Geological Summary of Kimberlites and Related Rocks in the Archangelsk Diamondiferous Region (ADR)

Гаранин¹,

Garanin²,

Kriulina

et al. 2021

Diamonds From the Arkhangelsk Province, NW Russia

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Petrogenesis of autoliths from kimberlitic breccias in the V. Grib Pipe (Arkhangelsk district)

Cited by 11 publications

References 3 publications

Клинопироксены Из Щелочных И Силикатно-Карбонатных Пород Чикского Массива (Сангиленское Нагорье, Тыва)

Клинопироксены Из Щелочных И Силикатно-Карбонатных Пород Чикского Массива (Сангиленское Нагорье, Тыва)

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

Geological Summary of Kimberlites and Related Rocks in the Archangelsk Diamondiferous Region (ADR)

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