Инд. авторы: | Чинь В., Багдассаров Н., Шацкий В.С. |
Заглавие: | Происхождение высокоскоростных аномалий под сибирским кратоном: свидетельство мультистадийного андерплейтинга магмы начиная с неоархея |
Библ. ссылка: | Чинь В., Багдассаров Н., Шацкий В.С. Происхождение высокоскоростных аномалий под сибирским кратоном: свидетельство мультистадийного андерплейтинга магмы начиная с неоархея // Геология и геофизика. - 2016. - Т.57. - № 5. - С.906-919. - ISSN 0016-7886. |
Внешние системы: | DOI: 10.15372/GiG20160506; РИНЦ: 26006039; |
Реферат: | eng: Despite the violent eruption of the Siberian Traps large igneous province at ~250 Ma, the Siberian craton has an extremely low heat flow (18-25 mW/m2) and a very thick lithosphere (300-350 km), which makes it an ideal place to study the influence of mantle plumes on the long-term stability of cratons. Compared with seismic velocities of rocks, the lower crust of the Siberian craton is composed mainly of mafic granulites and could be rather heterogeneous in composition. The very high vP (>7.2 km/s) in the lowermost crust can be fit by a mixture of garnet granulites, two-pyroxene granulites, and garnet gabbros as a result of magma underplating. The high-velocity anomaly in the upper mantle ( vP = 8.3-8.6 km/s) can be interpreted by a mixture of eclogites and spinel peridotites. Combined with the study of lower crustal and mantle xenoliths, we recognized multistage magma underplating at the crust-mantle boundary beneath the Siberian craton, including the Neoarchean growth and Paleoproterozoic assembly of the Siberian craton beneath the Markha terrane, the Proterozoic collision along the Sayan-Taimyr suture zone, and the Triassic Siberian Trap event beneath the central Tunguska basin. The Moho becomes a metamorphism boundary of mafic rocks between granulite facies and eclogite facies rather than a chemical boundary that separates the mafic lower crust from the ultramafic upper mantle. Therefore, multistage magma underplating since the Neoarchean will result in a seismic Moho shallower than the petrologic Moho. Such magmatism-induced compositional change and dehydration will increase viscosity of the lithospheric mantle and finally trigger lithospheric thickening after mantle plume activity. Hence, mantle plumes are not the key factor for craton destruction. rus: Несмотря на масштабное извержение в большой магматической провинции сибирских траппов 250 млн л.н., Сибирский кратон характеризуется чрезвычайно низким тепловым потоком (18-25 мВт/м2) и очень мощной литосферой (300-350 км), что делает его идеальным местом для изучения влияния мантийных плюмов на продолжительную стабильность кратонов. Сравнение с сейсмическими скоростями пород свидетельствует о том, что нижняя кора Сибирского кратона представлена главным образом мафическими гранулитами и могла быть достаточно неоднородной по составу. Очень высокие скорости vP (> 7.2 км/с) нижней коры могут объясняться смесью гранатовых гранулитов, двупироксеновых гранулитов и гранатового габбро, вызванных подслоенностью магм. Высокоскоростная аномалия в верхней мантии ( vP = 8.3-8.6 км/с) может интерпретироваться как результат смеси эклогитов и шпинелевых перидотитов. В сочетании с исследованиями нижнекоровых и мантийных ксенолитов мы выявили многостадийность процесса подслоенности магмы на границе кора-мантия под Сибирским кратоном, включая неоархейский рост коры и палеопротерозойское формирование Сибирского кратона под Мархинским террейном, протерозойскую коллизию вдоль Саяно-Таймырской сутурной зоны и извержение сибирских траппов в триасе под Центрально-Тунгусским бассейном. Граница Мохо является, скорее всего, границей между гранулитовой и эклогитовой фацией метаморфизма, а не химической границей, которая отделяет мафическую нижнюю кору от ультрамафитовой верхней мантии. Поэтому в результате процесса многоступенчатой подслоенности магм начиная с неоархея сейсмическая граница Мохо расположена на меньшей глубине по сравнению с петрологической границей Мохо. Такие изменения состава, вызванные магматизмом, а также уменьшение содержания воды приводят к увеличению вязкости литосферной мантии и, наконец, вызывают утолщение литосферы, вызванное активностью мантийных плюмов. Следовательно, мантийные плюмы не являются ключевым фактором деструкции кратона. |
Ключевые слова: | eclogites; seismic velocities; Siberian traps; Siberian Craton; скорость сейсмических волн; кратоны; литосфера; плюм; Moho; |
Издано: | 2016 |
Физ. характеристика: | с.906-919 |
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