МЕТОДИЧЕСКИЕ АСПЕКТЫ U/PB ДАТИРОВАНИЯ ЦИРКОНОВ НА МНОГОКОЛЛЕКТОРНОМ МАСС-СПЕКТРОМЕТРЕ С ИНДУКТИВНО-СВЯЗАННОЙ ПЛАЗМОЙ NEPTUNE PLUS С ПРИСТАВКОЙ ДЛЯ ЛАЗЕРНОЙ АБЛЯЦИИ NWR 213

Maria V. Zaitceva, Alexander A. Pupyshev, Julia V. Shchapova, Sergey L. Votyakov

Аннотация


Представлена методика анализа изотопного состава Pb и U в цирконах и процедура обработки данных, реализованные на масс-спектрометре с индуктивно-связанной плазмой Neptune Plus (фирма Thermo Scientific), оборудованном одним центральным неподвижным коллектором Фарадея и восемью подвижными, и приставке для лазерной абляции NWR 213 (фирма ESI). Определены оптимальные параметры для измерения изотопных отношений Pb/U, Pb/Th и Pb/Pb: расходы плазмообразующего, вспомогательного и пробоподающего потоков газа Ar, транспортирующего газа Не, мощность радиочастотного генератора, конфигурация коллекторов Фарадея, временные параметры регистрации сигнала. Выполнен анализ неопределенности измерения изотопных отношений, изучен вклад эффекта фракционирования на результаты измерения при различных операционных параметрах приставки для лазерной абляции, проведена корректировка дискриминации ионов по массе и оценено присутствие нерадиогенного свинца в стандартах цирконов. Даны рекомендации по выбору стандартов при исследовании цирконов. Отработана схема определения изотопных отношений Pb/U, Pb/Th и Pb/Pb с последующим расчетом возраста цирконов. Показаны различия эффектов элементного фракционирования в цирконах Mud Tank, 91500 и GJ–1, используемых в качестве стандартов, обусловленные различиями в степени их радиационного повреждения. По разработанному алгоритму рассчитан возраст этих стандартов (по конкордии для циркона Mud Tank значение возраста составило 735 ± 12 млн. лет (СКВО = 1.2, 2σ = 2 %), для циркона 91500 – 1054 ± 17 млн. лет (СКВО = 1.05, 2σ = 2 %) и для циркона GJ–1 – 606 ± 31 млн. лет (СКВО = 0.38, 2σ = 5 %)); показано удовлетворительное согласие с полученными ранее данными.

Ключевые слова: лазерная абляция, кратер, масс-спектрометрия, изотопные отношения, датирование U/Pb, цирконы, элементное фракционирование, дискриминация ионов по массе

DOI: http://dx.doi.org/10.15826/analitika.2016.20.2.008


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Литература


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