Thermal history of diamond from Arkhangelskaya and Karpinsky-I kimberlite pipes

Vasilev, E.; Kriulina, G.; Garanin, V.

Авторы: Vasilev Evgeny, Kriulina Galina, Garanin Victor
Журнал: Записки Горного института
Том: 255
Год издания: 2022
Издательство: Федеральное государственное бюджетное образовательное учреждение высшего образования Санкт-Петербургский горный университет
Местоположение издательства: Санкт-Петербург
Первая страница: 327
Последняя страница: 336
DOI: 10.31897/pmi.2022.57
Аннотация: Abstract. This work studies and compares the main morphological, structural, and mineralogical features of 350 diamondcrystals from the Karpinsky-I and 300 crystals of the Arkhangelskaya kimberlite pipes. The share of crystals of octahedralhabit together with individual crystals of transitional forms with sheaf-like and splintery striation is higher in the Arkhangelskaya pipe and makes 15 %. The share of cuboids and tetrahexahedroids is higher in the Karpinsky-I pipe and stands at14 %. The share of dodecahedroids in the Arkhangelskaya and Karpinsky-I pipes are 60 % and 50 %, respectively. Theindicator role of the nitrogen-vacancy N3 center active in absorption and luminescence is shown. Crystals with the N3absorption system have predominantly octahedral habit or dissolution forms derived from the octahedra. Their thermalhistory is the most complex. Absorption bands of the lowest-temperature hydrogen-containing defects (3050, 3144, 3154,3188, 3310 cm−1, 1388, 1407, 1432, 1456, 1465, 1503, 1551, 1563 cm−1), are typical for crystals without N3 system, wherein the absorption spectra nitrogen is in the form of low-temperature A and C defects. The above mentioned bands areregistered in the spectra of 16 % and 42 % of crystals from the Arkhangelskaya and Karpinsky-I pipes, respectively. Thediamond of the studied deposits is unique in the minimum temperature (duration) of natural annealing. Based on a set offeatures, three populations of crystals were distinguished, differing in growth conditions, post-growth, and thermal histories. The established regularities prove the multi-stage formation of diamond deposits in the north of the East EuropeanPlatform and significant differences from the diamonds of the Western Cisurals. The results suggest the possibility ofthe existence of primary deposits dominated by diamonds from one of the identified populations
Добавил в систему: Криулина Галина Юрьевна

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Thermal history of diamond from Arkhangelskaya and Karpinsky-I kimberlite pipesстатья

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