Typomorphism of Diamond from Deposits of the Arkhangelsk Diamondiferous Region

Гаранин, В. К.; Garanin, K.V.; Kriulina, Galina; Samosorov, George

doi:10.1007/978-3-030-35717-7_2

Cited by 1 publication

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“…Basalts, peridotites, and serpentinites absorb a significant amount of atmospheric CO 2 with the formation of low-temperature secondary carbonates [7][8][9]. This feature of rocks draws attention to the problem of the carbonization of kimberlite rocks that are reworked during diamond recovery [10][11][12]. Studies of kimberlite rocks show that olivine, serpentine, brusite, and smectite have the highest reactivity to interact with carbon dioxide.…”

Section: Introductionmentioning

confidence: 99%

Rare Hydrated Magnesium Carbonate Minerals Nesquehonite and Dypingite of the Obnazhennaya Kimberlite Pipe, in the Yakutian Kimberlite Province

Ugapeva,

Oleinikov,

Zayakina

2023

Minerals

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The result of a complex mineralogical study of the first discovery of the rare hydrated magnesium carbonate minerals of Nesquehonite and Dypingite in the Obnazhennaya kimberlite pipe (of the Yakutian kimberlite province) is presented. The methods of X-ray phase analysis, electronic microscopy, and Raman spectroscopy have established that the main minerals of the samples found in the form of white crust on a small area of rock outcrop of kimberlite breccia are hydrated carbonates: Nesquehonite is MgCO3•3H2O, Dypingite is Mg5(CO3)4(OH)2•5H2O. The formation of Dypingite over Nesquehonite was shown using Raman imaging for the first time. Nesquehonite is represented as aggregates consisting of chaotically oriented prismatic crystals or kidney-shaped formations. Dypingite in the examined samples appears less frequently as rose-shaped aggregates formed from lamellar crystals. It is assumed that the formation of rare carbonates of the Obnazhennaya kimberlite pipe is mainly the result of the weathering of silicates, formation of mineralized solutions, and their subsequent crystallization, including the capture of CO2 from the air.

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