Geodynamics of the Early Precambrian,Part 2: Formation of continental crust and sedimentary basins,specificity of the lithosphere |
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| Authors: | O M Rozen A A Shchipansky |
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| Institution: | (1) Geological Institute, Russian Academy of Sciences, Moscow, Russia |
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| Abstract: | This part of work is aimed at consideration of problems concerning evolution of geodynamic processes based on characteristic structures of the Early Precambrian and their rocks. Considered in the paper are structures characterizing existence of mature continental crust (sedimentary basins), development of the crust (metamorphic belts and granitoids) and underlying upper mantle (lithospheric keel), and amalgamation of crustal domains (continents, microcontinents, terrains) into supercontinents. Geodynamic phenomena of the Early Precambrian comparable with the Phanerozoic ones are distinguishable, on the one hand, and their changes with time of evolutionary character are detectable, on the other. The latter are satisfactorily explainable by secular lowering of the mantle temperature in general and above the top of mantle plumes. |
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| Keywords: | Early Precambrian sedimentary basins metamorphic belts granitoids diamond-bearing lithospheric keel supercontinents |
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