Planetary Felsic Crust Formation at Shallow Depth

Borisova, A.Y.; Zagrtdenov, N.R.; Toplis, M.J.; Bohrson, W.A.; Anne, N.; Safonov, O.G.; Pokrovski, G.S.; Georges, C.; Bindeman, I.N.; Melnik, O.E.; Klaus, P.J.; Brigitte, S.; Ulrike, W.; Bychkov, A.Y.; Gurenko, A.A.; Svyatoslav, S.; Artem, T.; Polukeev, V.M.; Varlamov, D.A.; Chariteiro Kouassi, E.A.; Sophie, G.; Philippe, D.

Авторы: Borisova Anastassia Y., Zagrtdenov Nail R., Toplis Michael J., Bohrson Wendy A., Anne Nedelec, Safonov Oleg G., Pokrovski Gleb S., Georges Ceuleneer, Bindeman Ilya N., Melnik Oleg E., Klaus Peter Jochum, Brigitte Stoll, Ulrike Weis, Bychkov Andrew Y., Gurenko Andrey A., Svyatoslav Shcheka, Artem Terehin, Polukeev Vladimir M., Varlamov Dmitry A., Chariteiro Kouassi E.A, Sophie Gouy, Philippe De Parseval
Сборник: arXiv:2003.01508
Год издания: 2020
Аннотация: Current theories suggest that on Earth and, possibly, on other terrestrial planets early in their history, the first continental crust may has been produced by direct melting of hydrated peridotite. However, the conditions, mechanisms and necessary ingredients of such production remain elusive. To fill this gap, we have conducted experiments of serpentinite melting in the presence of variable proportions of basaltic melt, at typical conditions of the shallow lithosphere and asthenosphere. These experiments revealed formation of silica-rich liquids, which are similar to tonalite-trondhjemite-granodiorite magmas (TTG) identified in modern terrestrial oceanic mantle settings. Our results suggest a new mechanism of aqueous fluid-assisted partial melting of peridotite that may have operated on the early Earth and Mars just after the solidification of an ultramafic-mafic magma ocean, leading to the formation of the first embryos of continental crust. The proposed mechanism of the continental crust formation may have been predominant before the onset of plate tectonics.
Добавил в систему: Мельник Олег Эдуардович

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Planetary Felsic Crust Formation at Shallow Depthстатья Электронная публикация

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