It is shown, using the example of the Baltic large Early Paleoproterozoic igneous province of the siliceous, high-Mg boninite-like series SHMS, that the layered intrusions had been intermediate-depth magma chambers beneath thick lava flows. Operating in these chambers had been the processes of the accumulation of periodically entered mantle-derived magmas, their crystallization differentiation, and the mixing of the fresh and evolved magmas. As a result, the magmas uprising from these chambers to the surface, are usually modified to various degrees, and primary mantle magmas are extremely rare. The origin of the SHMS magmas is believed to have been linked with large-scale assimilation of the lower-crustal material by the hot mantle-derived magmas as the new magma chamber that had originated at the crust-mantle boundary "floated'' upward. This floating seems to have operated by the mechanism of zone refinement, that is, by way of the melting of the roof's rocks with the simultaneous crystallization of the bottom. This "floating'' ceased when the magma chamber reached to the essentially sialic upper crust, because a layer of light granite magma with its own convection system originated in the upper part of the chamber. Similar positions are occupied by layered intrusions in large igneous provinces LIP that had originated after 2 billion years ago, when a change in tectonic and magmatic activity occured. These intrusions had been formed as a result of solidification of intermediate magma chambers residing at different depths, the uppermost of which had resided immediately beneath lava plateaus and the lowermost at the crust-mantle boundary, forming up the lower continental crust from below underplating. In all cases the LIP systems originated, irrespective of their composition, above protuberances local plumes on the surface of the superplumes, where the mantle material experienced melting. The character of the magma system evolution was controlled by the structure of the lithosphere, the heights of the plume rises, and the temperature of the mantle-derived magma. It is shown that the magmatic systems of the Moon highlands had been, apparently, of the same structure as those of the Earth.
intrusions, local plumes, igneous provinces, magnesian rocks, Baltic Shield, mantle-derived magmas.
1. Alapieti, Miner. Petrol., v. 42, no. 1-4, 1990., doi:https://doi.org/10.1007/BF01162681
2. Andersen, Amer. J. Sci., v. 39, no. 4, 1915.
3. Artyushkov, Developments of Geotectonics, 18, 1983.
4. Bindeman, Petrology, v. 7, no. 1, 1999.
5. Bogatikov, Magmatism and Geodynamics, Terrestrial Magmatism throughout the Earth's History, 2000.
6. Cawthorn, Developments in Petrology, v. 15, 1996.
7. Chalmers, Theory of solidification, 1968.
8. Chistyakov, Russian Journal of Earth Sciences, v. 4, no. 1, 2002.
9. Dobretsov, Deep-level geodynamics, Second edition, added and reworked, 2001.
10. Downes, J. Geol. Soc., London, v. 159, 2002.
11. Dyuzhikov, Geology and Metallogeny of the Noril'sk Region, 1988.
12. Girnis, Komatiites and Early Proterozoic High-Magnesian Volcanics O. A. Bogatikov Ed., 1988.
13. Gorbunov, Copper-Nickel Deposits of the Pechenga Region, 1999.
14. Grachev, Rift Zones of the Earth, 1987.
15. Fram, J. Petrology, v. 38, no. 2, 1997., doi:https://doi.org/10.1093/petrology/38.2.231
16. Heaman, Geology, v. 25, no. 4, 1997., doi:https://doi.org/10.1130/0091-76131997025lt;0299:GMMAGRgt;2.3.CO;2
17. Huppert, J. Petrology, v. 29, no. 3, 1988.
18. Kempton, Lithos, v. 36, 1995., doi:https://doi.org/10.1016/0024-49379500016-X
19. Kerr, Chem. Geol., v. 36, no. 1, 1995., doi:https://doi.org/10.1016/0009-25419500009-B
20. Kogarko, Alkaline Rocks and Carbonatites of the World, Part 2: Former USSR, 1995.
21. Kontinen, Intern. Ophiolite Symposium and Field Excursion, August 10-15, 1998, Oulu, Finland, Abstracts and Excursion Guide, E. Hanski and J. Vuollo eds., 1998.
22. Kovalenko, Intermediate and Acid Rocks, 1986.
23. Larsen, Gron. Geologiske Unders., Bull., v. 157, 1989.
24. McBirney, Layered Intrusions, Ed. R. G. Cawthorn, 1996.
25. Miller, Layered Intrusions, Developments in Petrology, 15, R. G. Cawthorn Ed., 1996.
26. Popov, Petrography and Petrology of Magmatic, Metamorphic and Metasomatic Rocks, 2001.
27. Rudnick, Nature, v. 347, no. 6295, 1990., doi:https://doi.org/10.1038/347711a0
28. Sharkov, Petrology of Layered Intrusions, 1980.
29. Sharkov, Geology of Ore Deposits, v. 40, no. 5, 1998.
30. Sharkov, Petrology, v. 9, no. 2, 2001.
31. Sharkov, Volcanology and Seismology, v. 12, no. 4, 1991.
32. Sharkov, Proc. USSR Acad. Sci., Ser. Geol., no. 7, 1987.
33. Sharkov, Precambrian Research, v. 82, 1997., doi:https://doi.org/10.1016/S0301-92689600041-1
34. Sharkov, Trans. Inst. Min. Metallurgy, Section B: Appl. Earth Sci., vol. 107, January-April, 1998.
35. Sharkov, Russian Arctic Region: Geological History, Metallogeny, and Geoecology, 2002.
36. Sharkov, Petrology, v. 5, no. 5, 1997.
37. Sharkov, Geochemistry Intern., no. 9, 1996.
38. Sharkov, Intern. Geol. Rev., v. 41, no. 1, 1999.
39. Sharkov, Geotectonics, v. 34, no. 2, 2000.
40. Snyder, J. Geophys. Res., v. 100, no. E5, 1995., doi:https://doi.org/10.1029/95JE00575
41. Upton, Layered Intrusions, R. G. Cawthorn ed., 1996.
42. Wager, Layered Igneous Rocks, 1968.
43. Yarmolyuk, Izv. USSR Ac. Sci., Ser. Geol., no. 12, 1990.
44. Zhangurov, 7th Intern. Platinum Symposium, Guide to the Pre-Symposium field trip, July 27-31, 1994, Kola Belt of Layered Intrusions, F. Mitrofanov and M. Torokhov Eds., 1994.
