Об Особенностях Алмазов Перспективных Территорий Сибирской Платформы

Зинчук, Н. Н.; Koptil, V. I.

doi:10.17072/psu.geol.27.41

Cited by 2 publications

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“…Diamonds from the Mir pipe have been thoroughly studied throughout the years. Most crystals have octahedral or transient octahedral-to-rhombododecahedral morphology with a small number of rounded-shaped crystals [1][2][3][4]. The colorless crystals with pink and brown hues of different intensities prevail [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

“…Most crystals have octahedral or transient octahedral-to-rhombododecahedral morphology with a small number of rounded-shaped crystals [1][2][3][4]. The colorless crystals with pink and brown hues of different intensities prevail [2][3][4]. Among the diamonds of the deposit, traces of heavy natural etching or dissolution are uncommon [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…The colorless crystals with pink and brown hues of different intensities prevail [2][3][4]. Among the diamonds of the deposit, traces of heavy natural etching or dissolution are uncommon [3,4]. The mineral inclusions in diamonds from the Mir pipe correspond mostly to peridotite paragenesis of their host rocks [1][2][3]5].…”

Section: Introductionmentioning

confidence: 99%

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Diamonds from the Mir Pipe (Yakutia): Spectroscopic Features and Annealing Studies

et al. 2021

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For this study, 21 samples of colorless octahedral diamonds (weighing 5.4–55.0 mg) from the Mir pipe (Yakutia) were investigated with photoluminescence (PL), infrared (IR), and electron paramagnetic resonance (EPR) spectroscopies. Based on the IR data, three groups of diamonds belonging to types IIa, IaAB, and IaB were selected and their spectroscopic features were analyzed in detail. The three categories of stones exhibited different characteristic PL systems. The type IaB diamonds demonstrated dominating nitrogen–nickel complexes S2, S3, and 523 nm, while they were less intensive or even absent in the type IaAB crystals. The type IIa diamonds showed a double peak at 417.4+418.7 nm (the 418 center in this study), which is assumed to be a nickel–boron defect. In the crystals analyzed, no matter which type, 490.7, 563.5, 613, and 676.3 nm systems of various intensity could be detected; moreover, N3, H3, and H4 centers were very common. The step-by-step annealing experiments were performed in the temperature range of 600–1700 °C. The treatment at 600 °C resulted in the 563.5 nm system’s disappearance; the interstitial carbon vacancy annihilation could be considered as a reason. The 676.5 nm and 613 nm defects annealed out at 1500 °C and 1700 °C, respectively. Furthermore, as a result of annealing at 1500 °C, the 558.5 and 576 nm centers characteristic of superdeep diamonds from São Luis (Brazil) appeared. These transformations could be explained by nitrogen diffusion or interaction with the dislocations and/or vacancies produced.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diamonds from the Mir Pipe (Yakutia): Spectroscopic Features and Annealing Studies

et al. 2021

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Prediction of the Primary Sources of Giant Clippir Diamonds in the North of Yakutia by the Method of Mineralogical and Geochemical Analogy (Method 5e Diagrams)

Ivanov,

Zinchenko,

Ashchepkov

et al. 2024

Geodin. tektonofiz.

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The finds of giant CLIPPIR-type diamonds in the placers hosted by the Ebelyakh River basin in the north of Yakutia suggest that similar diamonds can be found in the kimberlites of the Anabar region and the nearest northern deposits located within the collisional Khapchan and Daldyn terranes. To predict the discovery of such diamonds, the authors use the 5E diagram method based on the principle of similarity of the compositions of five oxides of satellite minerals (Grt, Cpx, Chr and Ilm) of diamond (DSM) with the reference diagrams for the Karowe pipe (K-6, Botswana) with the composition of those for any other pipe. It was previously shown that the convergence of the DSM compositions of the Karowe and V. Grib (Arkhangelsk diamond province) pipes is 74 %, which might indicate possible presence of CLIPPIR diamonds in the predicted pipe. The application of this technique to two kimberlite pipes of the Anabar region demonstrated that the probability of detecting such diamonds in the Leningrad pipe (Lower Devonian, medium diamond content potential) is 74 %, and in the Malokuonamskaya pipe (Lower Triassic, medium diamond content) is 20 %. A comparison of diagrams 5E and additional PTС – fO2 diagrams of reconstructed sections of the lithospheric mantle showed their efficiency in predicting favorable conditions of CLIPPIR-type diamond crystallization. It is assumed that formation of such diamonds may occur within the proto-kimberlite magmatic chamber located near the boundary of the lithosphere and associated with the asthenospheric source. It should be surrounded by low-oxidized carbon-rich mantle eclogites and dunites with high pressure and temperature, as well as magnesium-rich ilmenite-chromite metasomatites. The use of the 5E diagram method, as the approach to predict giant CLIPPIR diamonds in poorly diamondiferous kimberlites, might attract investing for exploration to audit the industrial potential of a series of such kimberlites in the Anabar region. Its implementation would significantly increase the efficiency of geological exploration and assessment of the potential of poorly diamondiferous pipes that have been suspended as subeconomic.

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Об Особенностях Алмазов Перспективных Территорий Сибирской Платформы

Cited by 2 publications

References 0 publications

Diamonds from the Mir Pipe (Yakutia): Spectroscopic Features and Annealing Studies

Diamonds from the Mir Pipe (Yakutia): Spectroscopic Features and Annealing Studies

Prediction of the Primary Sources of Giant Clippir Diamonds in the North of Yakutia by the Method of Mineralogical and Geochemical Analogy (Method 5e Diagrams)

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