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.2021.2.6 pmi-14497 https://pmi.spmi.ru/pmi/article/view/14497 Геология Geology Petrochemical features of tholeiites from the Shaka ridge (South Atlantic) Петрохимическая характеристика толеитов хребта Шака (Южная Атлантика) Rumyantseva Natalia А. Румянцева Н. А. Rumyantseva Natalia А. rumyancevanat@gmail.com 0000-0002-1173-4101 Всероссийский научно-исследовательский институт геологии и минеральных ресурсов Мирового океана имени ака-демика И.С.Грамберга (Санкт-Петербург, Россия) Academician I.S.Gramberg All-Russia Scientific Research Institute for Geology and Mineral Resources of the Ocean (Saint Petersburg, Russia) Vanshteyn Boris G. Ванштейн Б. Г. Vanshteyn Boris G. vanshbor@mail.ru 0000-0003-3460-741X Всероссийский научно-исследовательский институт геологии и минеральных ресурсов Мирового океана имени ака-демика И.С.Грамберга (Санкт-Петербург, Россия) Academician I.S.Gramberg All-Russia Scientific Research Institute for Geology and Mineral Resources of the Ocean (Saint Petersburg, Russia) Skublov Sergey G. Скублов С. Г. Skublov Sergey G. skublov@yandex.ru 0000-0002-5227-4260 Санкт-Петербургский горный университет (Санкт-Петербург, Россия) Saint Petersburg Mining University (Saint Petersburg, Russia) 24 06 2021 2021 248 223 231 20 11 2020 30 03 2021 24 06 2021 © Natalia А. Rumyantseva, Boris G. Vanshteyn, Sergey G. Skublov 2021 Н. А. Румянцева, Б. Г. Ванштейн, С. Г. Скублов Natalia А. Rumyantseva, Boris G. Vanshteyn, Sergey G. Skublov CC BY 4.0 https://pmi.spmi.ru/pmi/article/view/14497

В статье представлены оригинальные данные по химическому составу толеитовых базальтоидов и андезитов, драгированных из хребта Шака (Южная Атлантика) в ходе экспедиционных исследований весной 2016 г. на научно-экспедиционном судне «Академик Федоров». Аналитическая часть работы по определению содержаний петрогенных, редких и редкоземельных элементов выполнялась при помощи классического метода («мокрой химии»), рентгеноспектрального флуоресцентного анализа (РФА) и ICP-MS. Изучаемые образцы демонстрируют повышенные концентрации крупноионных литофильных элементов LILE (Ba, Rb, Pb) и легких редкоземельных элементов LREE (La, Ce, Nd, Sm) относительно высокозарядных HFSE (Nb, Ta) и тяжелых редкоземельных элементов HREE (Dy, Yb, Lu). Особенности геохимии редких элементов предполагают значительный вклад корового или субдукционного компонентов в магмы хребта Шака. Дискриминационные диаграммы для базальтоидов и близких к ним пород с полями различных геодинамических обстановок свидетельствуют о том, что они образовывались в обстановке срединно-океанического хребта MORB. Причина появления в породах субдукционных и коровых меток, возможно, связана с процессами ассимиляции магмами корового вещества или заключается в их унаследовании от мантийного источника.

The article presents original data of chemical composition of tholeiitic basaltoids and andesites, dredged from the Shaka Ridge (South Atlantic) in the course of field research in spring 2016 on the scientific expedition vessel “Akademik Fedorov”. The analytical part of the work on estimating the contents of petrogenic, trace and rare-earth elements was carried out using the classical method (“wet chemistry”), X-ray fluorescence analysis (XRF) and inductively coupled plasma mass spectrometry (ICP-MS). The studied samples demonstrate elevated concentrations of large-ion lithophile elements, or LILE, (Ba, Rb, Pb) and light rare earth elements, or LREE, (La, Ce, Nd, Sm) relative to high field strength elements, or HFSE, (Nb, Ta) and heavy rare earth elements, or HREE, (Dy, Yb, Lu). The specifics of trace element geochemistry suggest a significant contribution of crustal or subduction components to the magmas of the Shaka Ridge. Discrimination diagrams of basaltoids and allied rocks with fields of different geodynamic settings indicate that they were formed in the setting of the mid-ocean ridge basalt (MORB). The reason behind the appearance of subduction and crustal marks in the rocks is possibly associated with assimilation of crustal matter by magmas or lies in their inheritance from the mantle source.

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