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.2022.39 pmi-15827 https://pmi.spmi.ru/pmi/article/view/15827 Геология Geology Features of olivine crystallization in ordinary chondrites (Saratov meteorite): geochemistry of trace and rare earth elements Особенности кристаллизации оливина в обыкновенных хондритах (метеорит Саратов): геохимия редких и редкоземельных элементов Sukhanova Kristina G. Суханова К. Г. Sukhanova Kristina G. cris.suhanova92@yandex.ru 0000-0002-2959-2922 Институт геологии и геохронологии докембрия РАН (Россия) Institute of Precambrian Geology and Geochronology RAS (Russia) Kuznetsov Anton B. Кузнецов А. Б. Kuznetsov Anton B. antonbor9@mail.ru 0000-0002-2959-2922 Институт геологии и геохронологии докембрия РАН (Россия) Institute of Precambrian Geology and Geochronology RAS (Russia) Galankina Olga L. Галанкина О. Л. Galankina Olga L. galankinaol@mail.ru 0000-0003-2761-2835 Институт геологии и геохронологии докембрия РАН (Россия) Institute of Precambrian Geology and Geochronology RAS (Russia) 13 07 2022 2022 254 149 157 02 05 2022 25 05 2022 13 07 2022 © 2022 К. Г. Суханова, А. Б. Кузнецов, О. Л. Галанкина © 2022 Kristina G. Sukhanova, Anton B. Kuznetsov, Olga L. Galankina 2022 К. Г. Суханова, А. Б. Кузнецов, О. Л. Галанкина Kristina G. Sukhanova, Anton B. Kuznetsov, Olga L. Galankina 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/15827

Обсуждается геохимия главных (EMPA) и редких (SIMS) элементов в оливине порфировых, непорфировых хондр и матрице равновесного обыкновенного хондрита Саратов (L4). Оливин соответствует форстериту и довольно неоднороден (Fo 73-77). Различий содержания главных элементов в оливине хондр и матрицы метеорита не обнаружено. Однако содержание главных и редких элементов в оливине внутри хондр значительно различается, высокие значениями установлены в оливине колосниковой хондры. Оливин порфировых хондр и матрицы метеорита Саратов обладает схожими концентрациями редких элементов. Высокие содержания тугоплавких (Zr, Y, Al) и умеренно-летучих (Sr и Ba) редких элементов в оливине колосниковой хондры указывают на образование расплава хондры в результате плавления минералов-предшественников и его быстрое остывание в протопланетном диске, что согласуется с экспериментальными данными. Оливин центральной части хондр метеорита Саратов отличается от оливина каймы хондр и матрицы метеорита повышенными значениями Yb/La отношения. Реликтовых зерен и магнезиальных ядер оливина в хондрах метеорита не обнаружено. Отдельные зерна в хондрах выделяются обогащенностью редкими элементами относительно остальных зерен оливина в хондре.

The paper discusses the geochemistry of major (EPMA) and trace (SIMS) elements in olivine of porphyritic, nonporphyritic chondrules, and the matrix of equilibrated ordinary chondrite Saratov (L4). Olivine corresponds to forsterite and is rather heterogeneous (Fo 73-77). No differences in the content of the major elements in the olivine of the chondrule and the matrix of the meteorite were found. However, the content of major and trace elements in olivine within chondrules varies considerably; high values found in olivine from barred chondrules. Olivine from porphyritic chondrules and the matrix of the Saratov meteorite have similar concentrations of trace elements. High concentrations of refractory (Zr, Y, Al) and moderately volatile (Sr and Ba) trace elements in barred olivine chondrule indicate the chondrule melt formation due to the melting of precursor minerals and its rapid cooling in the protoplanetary disk, which is consistent with the experimental data. The olivine of the chondrules center of the Saratov meteorite differs from the olivine of the chondrules rims and meteorite matrix by the increased values of the Yb/La ratio. No relict grains and magnesian cores of olivine were found in meteorite chondrules. Individual grains in the chondrules are distinguished by their enrichment in trace elements relative to the rest of the olivine grains in the chondrule.

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