Recent crustal uplift of Precambrian cratons: key patterns and possible mechanisms

Artyushkov, E.V.; Korikovsky, S.P.; Massonne, H.J.; Chekhovich, P.A.

Авторы: Artyushkov E.V., Korikovsky S.P., Massonne H.J., Chekhovich P.A.
Журнал: Russian Geology and Geophysics
Том: 59
Номер: 11
Год издания: 2018
Издательство: ELSEVIER SCIENCE BV
Местоположение издательства: PO BOX 211, AMSTERDAM, NETHERLANDS, 1000 AE
Первая страница: 1389
Последняя страница: 1409
Оригинальные версии: Новейшие поднятия коры на докембрийских кратонах. Основные закономерности и возможные механизмы
DOI: 10.1016/j.rgg.2018.10.001
Аннотация: Precambrian cratons cover about 70% of the total area of the continents. According to a large volume of geomorphological, geological, paleontological and other data for the Pliocene and Pleistocene these cratons have experienced a crustal uplift from 100-200 m to 1000-1500 m commonly called recent or Neotectonic uplift. Shortening of the Precambrian crust terminated half a billion years ago or earlier, and its uplift could not have been produced by this mechanism. According to the main models of dynamic topography in the mantle, the distribution of displacements at the surface is quite different from that of the Neotectonic movements. Under most of the Precambrian cratons no magmatic underplating can be observed according to seismic data. In most cratonic areas the mantle lithosphere is very thick which makes its recent delamination rather improbable. Asthenospheric replacement of the lower part of the mantle lithosphere under the Precambrian cratons could produce only a minor part of their Neotectonic uplift. Because of the inability of the above mechanisms to explain this phenomenon, rock expansion in the crustal layer is supposed to be the main cause of the recent uplift of Precambrian cratons. This is supported by strong lateral non-uniformity of the uplift which indicates that expansion of rocks took place at shallow depth. Expansion could occur in crustal rocks which emerged from the lower crust into the middle crust with lower pressure and temperature after denudation of a thick layer of rocks at the surface. In a dry state these rocks will remain metastable for a long time. However, rapid metamorphism accompanied by expansion of rocks can be caused by infiltration of hydrous fluids from the mantle. Analysis of phase diagrams for common crustal rocks demonstrates that this mechanism is able to explain the recent crustal uplift of Precambrian cratons.
Добавил в систему: Чехович Петр Андреевич

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