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- Gladkochub, D. P., et al.
(författare)
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Proterozoic basic magmatism of the Siberian Craton: Main stages and their geodynamic interpretation
- 2012
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Ingår i: Geotectonics. - 0016-8521. ; 46:4, s. 273-284
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Tidskriftsartikel (refereegranskat)abstract
- Geological data on the Precambrian basic complexes of the Siberian Craton and their isotopic age are considered. The three main episodes of Precambrian basic magmatism of Siberia correspond to certain stages of the geodynamic evolution of the craton and the Earth as a whole. In the Late Paleoproterozoic, largely in the south and the north of the craton, the basic rocks were emplaced against the background of post-collision extension, which followed the preceding collision-accretion stage responsible for the formation of the craton. In the Mesoproterozoic, primarily in the north of the craton, basic magmatism was controlled by dispersed within-plate extension apparently caused by the impact of a mantle plume. Neoproterozoic basic magmatism widespread in the southern and southeastern parts of the craton was caused by rifting, which accompanied breakdown of the Rodinia supercontinent and opening of the Paleoasian ocean along the southern margin of the Siberian Craton.
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- Pisarevsky, S. A., et al.
(författare)
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Paleomagnetism Of 1780-1770 Ma Mafic And Composite Intrusions Of Smaland (Sweden): Implications For The Mesoproterozoic Supercontinent
- 2010
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Ingår i: American Journal of Science. - : American Journal of Science (AJS). - 0002-9599. ; 310:9, s. 1168-1186
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Tidskriftsartikel (refereegranskat)abstract
- We present a paleomagnefic study of 1785 to 1770 Ma composite and mafic intrusions in Smaland, Sweden. A positive inverse baked contact test suggests the primary nature of their magnetization. The palaeomagnetic pole (45.7 degrees N, 182.7 degrees E, A(95)=8.0 degrees) may be regarded as a key pole for Fennoscandia. Available paleomagnetic data suggest that Laurentia and Fennoscandia/Balfica drifted together since 1780 Ma until at least 1265 Ma. These two continents could form a core of a hypothetical Mesoproterozoic supercontinent.
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