Инд. авторы: | Рагозин А.Л., Каримова А.А., Литасов К.Д., Зедгенизов Д.А., Шацкий В.С |
Заглавие: | Содержание воды в минералах мантийных ксенолитов из кимберлитов трубки удачная ( якутия) |
Библ. ссылка: | Рагозин А.Л., Каримова А.А., Литасов К.Д., Зедгенизов Д.А., Шацкий В.С Содержание воды в минералах мантийных ксенолитов из кимберлитов трубки удачная ( якутия) // Геология и геофизика. - 2014. - Т.55. - № 4. - С.549-567. - ISSN 0016-7886. |
Внешние системы: | РИНЦ: 21975307; |
Реферат: | eng: Distribution of water among the main rock-forming nominally anhydrous minerals of mantle xenoliths of peridotitic and eclogitic parageneses from the Udachnaya kimberlite pipe, Yakutia, has been studied by IR spectroscopy. The spectra of all minerals exhibit vibrations attributed to hydroxyl structural defects. The content of H2O (ppm) in minerals of peridotites is as follows: 23-75 in olivine, 52-317 in orthopyroxene, 29-126 in clinopyroxene, and 0-95 in garnet. In eclogites, garnet contains up to 833 ppm H2O, and clinopyroxene, up to 1898 ppm (~0.19 wt.%). The obtained data and the results of previous studies of minerals of mantle xenoliths show wide variations in H2O contents both within different kimberlite provinces and within the Udachnaya kimberlite pipe. Judging from the volume ratios of mineral phases in the studied xenoliths, the water content varies over narrow ranges of values, 38-126 ppm. At the same time, the water content in the studied eclogite xenoliths is much higher and varies widely, 391-1112 ppm. rus: Приведены результаты исследования распределения воды среди основных породообразующих номинально безводных минералов мантийных ксенолитов из кимберлитовой тр. Удачная (Якутия) с использованием инфракрасной спектроскопии. Были изучены образцы ксенолитов перидотитового и эклогитового парагенезисов. Во всех минералах зафиксированы колебания, относящиеся к гидроксильным дефектам в их структурах. В перидотитах оливин содержит H 2O (г/т) 23-75, ортопироксен - 52-317, клинопироксен - 29-126, гранат - 0-95. В эклогитах гранат содержит H 2O до 833 г/т, клинопироксен - до 1898 г/т (~ 0.19 мас. %). Сопоставление полученных данных с результатами предыдущих исследований содержания воды в отдельных минералах мантийных ксенолитов указывает на значительный разброс концентраций Н 2О как в пределах разных кимберлитовых провинций, так и в пределах отдельной кимберлитовой тр. Удачная. Исходя из объемных соотношений минеральных фаз в изученных ксенолитах, концентрация воды в перидотитах изменяется в узких пределах и оценивается в 38-126 г/т. В то же время содержание воды в исследованных ксенолитах эклогитов существенно выше и варьирует в широких пределах (391-1112 г/т). |
Ключевые слова: | перидотит; эклогит; верхняя мантия; Номинально безводные минералы; IR spectroscopy; peridotite; eclogite; upper mantle; Nominally anhydrous minerals; ИК-спектроскопия; |
Издано: | 2014 |
Физ. характеристика: | с.549-567 |
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