Аномальные магнитные свойства палеопротерозойских железистых кварцитов Курского блока (Воронежский кристаллический массив)
Ключевые слова:
железистые кварциты, петромагнетизм, рудная минералогия, Курский блок, Воронежский кристаллический массив
Аннотация
Введение: палеопротерозойские железисто-кремнистые формации играют ключевую роль в формировании аномального магнитного поля Курского блока Воронежского кристаллического массива (ВКМ). Целью данного исследования является изучение петромагнитных характеристик железистых кварцитов Курского блока ВКМ, ориентированное на решение задач построения геологически содержательных магнитных моделей литосферы региона.
Методика: изучены образцы керна железистых кварцитов из скважины на фланге Стойленского месторождения КМА. Выполнены измерения величины магнитной восприимчивости, её анизотропии и температурной зависимости. Определялось значение естественной остаточной намагниченности и параметров петель гистерезиса образцов пород. Выполнено петрографическое описание минерального состава рудной компоненты породы для образцов с наиболее контрастными петромагнитными свойствами.
Обсуждение результатов: магнитная восприимчивость образцов варьирует в диапазоне от 0.32 до 1.45 ед. СИ со средним значением 0.87 ед. СИ и анизотропией от 24 до 136%. Естественная остаточная намагниченность характеризуется аномально высокими значениями до 2645 А/м при среднем значении 660 А/м. Отношение Кёнигсбергера для изученных образцов изменяется от 8 до 34. Величина намагниченности насыщения колеблется в пределах от 1.30 до 12.34 мAм2. Коэрцитивная сила изменяется в пределах от 2.52 до 21.01 мТл, а остаточная коэрцитивная сила от 10.73 до 62.36 мТл. Термомагнитные определения указывают на преобладание в изученных образцах ферромагнитной фазы с точкой Кюри около 568°С.
Заключение: полученные оценки магнитной восприимчивости показывают, что при моделировании рудных объектов, сложенных железистыми кварцитами, обязательно следует учитывать эффект размагничивания на формирование внешнего магнитного поля. Оценка аномальной величины остаточного намагничения может выступать как верхнее ограничение на искомые решения обратной задачи магнитометрии, учитывающей индуктивную/остаточную намагниченность и эффект размагничивания. Наличие однодоменных зёрен магнетита и высокое значение коэрцитивной силы способствует консервации вектора естественной остаточной намагниченности пород железисто-кремнистой формации Курского блока.
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Литература
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7. Maus S., Barckhausen U., Berkenbosch H., Bournas N., Brozena J., Childers V., Dostaler F., Fairhead J. D., Finn C., von Frese R. R. B., Gaina C., Golynsky S., Kucks R., Lühr H., Milligan P., Mogren S., Müller R. D., Olesen O., Pilkington M., Saltus R., Schreckenberger B., Thébault E., Tontini F. C. EMAG2: A 2–arc min resolution Earth Magnetic Anomaly Grid compiled from satellite, airborne, and marine magnetic measurements. Geochemistry, Geophysics, Geosystems, 2009, 10 (8), Q08005. DOI: 10.1029/2009GC002471
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10. Thebault E., Vigneron P., Langlais B., Hulot G. A Swarm lithospheric magnetic field model to SH degree 80. Earth Planets Space, 2016, 68, no. 126, pp. 1−3. DOI: 10.1186/s40623-016-0510-5
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Опубликован
2025-09-30
Как цитировать
Ильин, В. В., Жаворонкин, В. И., Глазнев, В. Н., Муравина, О. М., Цыбуляев, С. В., Савко, К. А., & Федюкин, И. В. (2025). Аномальные магнитные свойства палеопротерозойских железистых кварцитов Курского блока (Воронежский кристаллический массив). Вестник ВГУ. Серия: Геология, (3), 51-64. https://doi.org/10.17308/geology/1609-0691/2025/3/51-64
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Геофизика
