Oceanic sediments of the Amur Terrane: Their age and tectonic significance |
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Authors: | S V Zyabrev |
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Institution: | 1.Kosygin Institute of Tectonics and Geophysics, Far East Branch,Russian Academy of Sciences,Khabarovsk,Russia |
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Abstract: | The oceanic pelagic and hemipelagic siliceous and siliceous-clayey sediments play a subordinate role in the Amur Terrane,
where they constitute thin tectonic slices separated by thicker terrigenous continental-margin deposits. The analysis of the
radiolarian assemblages revealed the Middle-Late Jurassic age of hemipelagic siliceous mudstone and the Early Cretaceous age
of similar continental-margin sediments. These new data contribute to the knowledge of the terrane's stratigraphy and demonstrate
the progressively younger age of the stratigraphic boundaries between the different sedimentary facies in the southeastern
direction. The multiple stacking of the oceanic and continental-margin sediments is characteristic of the accretionary complexes,
and precisely such an interpretation of the tectonic nature of the Amur Terrane is consistent with its composition and position
in the regional structure. |
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