Regularities in the formation and evolution of volcanosedimentary complexes in the Early Precambrian |
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| Authors: | O G Lazur |
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| Institution: | 1.Geological Institute,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | The main objective of this work was to define directions and principal features of the evolution of volcanism and sedimentation
in Early Precambrian active volcanic zones. Analysis of reconstructed type sections of intensely metamorphosed and greenstone
(sedimentary-volcanic) complexes revealed a general similarity of their structure and universal presence of two principal
(contrast and differentiated) volcanic associations that replace each other from the bottom to top (Lazur, 2006). Volcanic
complexes are crowned with significantly sedimentary sequences and the manifestation of bimodal (basalt-rhyolite) or acid
(dacite-rhyolite) volcanism (Luchitskii et al., 1982). Our work is based on specific rock complexes, for which the primary
nature of intensely metamorphosed Early Precambrian rocks has been reconstructed by geological, mineralogical, geochemical,
and other methods (Lazur, 1986; Rosen et al., 2005). |
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