دورية أكاديمية
Inclusions of diamond crystals in the tourmaline of the schorl-uvite series: problems of genesis
| العنوان: | Inclusions of diamond crystals in the tourmaline of the schorl-uvite series: problems of genesis |
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| المؤلفون: | Andrei V. Korsakov, Denis S. Mikhailenko, Le Zhang, Yi-Gang Xu |
| المصدر: | Записки Горного института, Vol 264, Pp 833-841 (2023) |
| بيانات النشر: | Saint-Petersburg Mining University, 2023. |
| سنة النشر: | 2023 |
| المجموعة: | LCC:Mining engineering. Metallurgy |
| مصطلحات موضوعية: | tourmaline, diamond, boron isotopic composition, silicate-carbonate rocks, subduction, high pressure metamorphism, kokchetav, Mining engineering. Metallurgy, TN1-997 |
| الوصف: | The mineralogical and geochemical features of diamond-bearing tourmaline crystals (schorl-uvite series) from garnet-clinopyroxene rocks of the Kumdy-Kol deposit (Northern Kazakhstan) have been studied in detail. The formation of the main rock-forming minerals (garnet + K-bearing clinopyroxene) occurred in the diamond stability field at 4-6 GPa and 950-1000 °C. Crystallization of K-bearing clinopyroxene at these parameters is possible in the presence of an ultra-potassic fluid or melt formed because of crustal material melting in subduction zones. Tourmaline crystals (up to 1 cm) containing diamond inclusions perform veins crosscutting high-pressure associations. The composition of individual zones varies from schorl to uvite within both a single grain and the sample as a whole. The potassium content in this tourmaline does not exceed 0.1 wt.% K2O, and the isotopic composition of boron δ11B varies from –10 to –15.5 ‰, which significantly differs from the previously established isotopic composition of boron in maruyamaite crystals (δ11B 7.7 ‰ in the core and –1.2 ‰ in the rim) of the same deposit. Analysis of the obtained data on δ11B in the tourmalines from the diamond-grade metamorphic rocks within the Kumdy-Kol deposit suggests the existence of two boron sources that resulted in crystallization of K-bearing tourmaline crystals (maruyamaite-dravite series) and potassium-free tourmalines of the schorl-uvite series. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English Russian |
| تدمد: | 2411-3336 2541-9404 |
| Relation: | https://pmi.spmi.ru/pmi/article/view/16082?setLocale=en_US; https://doaj.org/toc/2411-3336; https://doaj.org/toc/2541-9404 |
| URL الوصول: | https://doaj.org/article/0fd0417895f44487ae7c0d3b198e5639 |
| رقم الأكسشن: | edsdoj.0fd0417895f44487ae7c0d3b198e5639 |
| قاعدة البيانات: | Directory of Open Access Journals |
Full Text Finder | تدمد: | 24113336 25419404 |
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