Суперхондритовые Nb/Ta и Zr/Hf отношения в перидотитах и эклогитах субконтинентальной литосферной мантии: данные мантийных ксенолитов

  • Лариса Петровна Никитина Институт геологии и геохронологии докембрия РАН, Россия, 199034, Санкт-Петербург, наб. Макарова, 2
  • Мирьям Самуиловна Бабушкина Институт геологии и геохронологии докембрия РАН, Россия, 199034, Санкт-Петербург, наб. Макарова, 2

Аннотация

На основе авторских и литературных данных о концентрации Nb, Ta, Zr и Hf и отношений Nb/Ta и Zr/Hf в ксенолитах эклогитов и перидотитов из субконтинентальной литосферной мантии (СКЛМ), подстилающей кратоны, установлено: (1) ксенолиты перидотитов из мантии Каапваальского, Североамериканского и Сибирского кратонов (Т от 900-1000 до 1350-1400 °C, Р от 1.5-2.0 до 5-6 ГПа, DlogfO2FMQ от -5 до -3) обогащены Nb и Ta относительно хондрита CI и примитивной мантии PM, тогда как перидотиты из мантии Северокитайского кратона по их содержанию близки к CI или обеднены по сравнению с ним; (2) несмотря на значительные колебания, суперхондритовые значения Nb/Ta (>17,4) и Zr/Hf (>36,0) свойственны большинству перидотитовых ксенолитов из мантии кратонов, за исключением Cеверокитайского, где они близки или ниже CI; (3) в ксенолитах эклогитов из мантии кратонов   Кассаи, Мен, Слейв (Т от 900-1000 до 1400-1500°C, Р от 3 до 5-6 ГПа) содержание Nb на 2-3 порядка превышает таковые в CI и PM, отношение Nb/Ta колеблется от хондритовых до суперхондритовых значений. Зоны СКЛМ, соответствующие области стабильности алмаза, являются одним из резервуаров в BSE с суперхондритовыми Nb/Ta и Zr/Hf значениями и зарождение таких зон, возможно, происходило еще на этапе кристаллизации «магматического океана». Таким образом, СКЛМ неоднородна по степени фракционирования Nb относительно Ta и Zr относительно Hf, и конвекция, охватывающая, как предполагается многими, всю мантию, не привела к полной ее гомогенизации в отношении HFSE, несмотря на длительную историю Земли. При обсуждении проблемы дисбаланса масс Nb и Ta и «недостающего» Nb в силикатной Земле необходимо учитывать, что часть его находится в СКЛМ, в зонах стабильности алмаза.

Ключевые слова:

субконтинентальная литосферная мантия, перидотиты, эклогиты, HFSE, фракционирование Nb, Ta, Zr и Hf

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Литература

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Опубликован
2019-06-01
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Никитина, Л. П. и Бабушкина, М. С. (2019) «Суперхондритовые Nb/Ta и Zr/Hf отношения в перидотитах и эклогитах субконтинентальной литосферной мантии: данные мантийных ксенолитов», Вестник Санкт-Петербургского университета. Науки о Земле, 64(2), сс. 294-314. doi: 10.21638/spbu07.2019.208.
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