Geodynamics of the Early Precambrian,Part 1: Volcanism and associated mantle processes |
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| Authors: | O M Rosen A A Shchipansky |
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| Institution: | (1) Geological Institute, Russian Academy of Sciences, Moscow, Russia |
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| Abstract: | The work is dedicated to most important abiotic processes of the Early Precambrian, effect of which is recorded in continental crust, and to complementary processes in subcontinental mantle. We intend to figure out when a certain process was triggered first in the past and what indications suggest its further activity, evolution and possible cessation in subsequent geological history. Considerations are based on described natural objects characterizing particular geological events and enabling the cause-and-effect interpretation in order to understand different viewpoints known from publications. Considered in the work are the early Precambrian greenstone belts and ophiolites, island-arc systems and ecologites, magmatism unconnected with subduction zones (rifting-related, plateau basalts, dykes, kimberlites) and anorthosites representing a group of heterochronous intrusions of complicated genesis. Main considerations are premised with a brief review of the earliest geodynamic phenomena associated with meteorite impacts by termination of the planetary accretion. |
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| Keywords: | Early Precambrian oceanic lithosphere ophiolites oceanic plateaus island-arc systems eclogites extrasubduction magmatism rifting anorthosites |
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