2411-3336 2541-9404 Записки Горного института Journal of Mining Institute Санкт-Петербургский горный университет императрицы Екатерины ΙΙ Empress Catherine II Saint Petersburg Mining University 10.31897/PMI.2022.40 pmi-15810 https://pmi.spmi.ru/pmi/article/view/15810 Геология Geology Geochemistry of beryl varieties: comparative analysis and visualization of analytical data by principal component analysis (PCA) and t-distributed stochastic neighbor embedding (t-SNE) Геохимия разновидностей берилла: сравнительный анализ и визуализация аналитических данных методами главных компонент (PCA) и стохастического вложения соседей с t-распределением (t-SNE) Skublov Sergey G. Скублов С. Г. Skublov Sergey G. skublov@yandex.ru 0000-0002-5227-4260 Институт геологии и геохронологии докембрия РАН (Россия) Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences (Russia) Gavrilchik Aleksandra K. Гаврильчик А. К. Gavrilchik Aleksandra K. skublov@yandex.ru 0000-0002-4851-1729 Санкт-Петербургский Горный университет (Россия) Saint Petersburg Mining University (Russia) Berezin Aleksei V. Березин А. В. Berezin Aleksei V. skublov@yandex.ru 0000-0002-5324-5840 Институт геологии и геохронологии докембрия РАН (Россия) Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences (Russia) 26 07 2022 2022 255 455 469 17 04 2022 25 05 2022 26 07 2022 © 2022 С. Г. Скублов, А. К. Гаврильчик, А. В. Березин © 2022 Sergey G. Skublov, Aleksandra K. Gavrilchik, Aleksei V. Berezin 2022 С. Г. Скублов, А. К. Гаврильчик, А. В. Березин Sergey G. Skublov, Aleksandra K. Gavrilchik, Aleksei V. Berezin Эта статья доступна по лицензии Creative Commons Attribution 4.0 International (CC BY 4.0) This article is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0) https://pmi.spmi.ru/pmi/article/view/15810

Проведено исследование редкоэлементного состава разновидностей берилла (469 анализов методом SIMS). Красные бериллы выделяются повышенным содержанием Ni, Sc, Mn, Fe, Ti, Cs, Rb, K, B и пониженным Na и воды. Розовые бериллы отличаются повышенным содержанием Cs, Rb, Na, Li, Cl и воды при пониженном Mg и Fe. Зеленые бериллы характеризуются повышенным содержанием Cr, V, Mg, Na и воды при пониженном Cs. Особенностью желтых бериллов является пониженное содержание Mg, Cs, Rb, K, Na, Li и Cl. Для бериллов различных оттенков голубого и синего цвета (аквамаринов) характерно повышенное содержание Fe и пониженное Cs и Rb. Для белых бериллов установлено повышенное содержание Na и Li. Метод главных компонент (PCA) c CLR-преобразованием показал, что по первому компоненту происходит обособление зеленых бериллов от других разновидностей. По второму компоненту обособляются розовые и красные бериллы. Метод стохастического вложения соседей с t-распределением (t-SNE) с CLR-преобразованием данных продемонстрировал контрастность составов зеленых бериллов относительно других разновидностей. Красные и розовые бериллы образуют самые компактные кластеры.

A study of the trace element composition of beryl varieties (469 SIMS analyses) was carried out. Red beryls are distinguished by a higher content of Ni, Sc, Mn, Fe, Ti, Cs, Rb, K, and B and lower content of Na and water. Pink beryls are characterized by a higher content of Cs, Rb, Na, Li, Cl, and water with lower content of Mg and Fe. Green beryls are defined by the increased content of Cr, V, Mg, Na, and water with reduced Cs. A feature of yellow beryls is the reduced content of Mg, Cs, Rb, K, Na, Li, and Cl. Beryls of various shades of blue and dark blue (aquamarines) are characterized by higher Fe content and lower Cs and Rb content. For white beryls, increased content of Na and Li has been established. Principal Component Analysis (PCA) for the CLR-transformed dataset showed that the first component separates green beryls from other varieties. The second component divides pink and red beryls. The stochastic neighborhood embedding method with t-distribution (t-SNE) with CLR-transformed data demonstrated the contrasting compositions of green beryls relative to other varieties. Red and pink beryls form the most compact clusters.

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