Clastic Rocks from Permian and Triassic Cherty Sequences in Sikhote Alin and Japan |
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| Authors: | Filippov A N Kemkin I V |
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| Institution: | (1) Far East Geological Institute, Far East Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022, Russia |
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| Abstract: | Specific structural–textural and mineralogical–petrographic features of clastic rocks, which make up sparse thin layers within Permian and Triassic cherty sequences in Sikhote Alin and Japan, are discussed. The cherty sequences were retained in the Jurassic accretionary complex as fragments of sedimentary cover of an ancient oceanic basin. They were mainly formed by turbidity currents that originated on intrabasinal uplifts composed of tholeiitic basalts in the Permian. In the Triassic, the currents originated on uplifts consisting of ocean-island alkali basalts along with Permian and Lower Triassic cherty and cherty–clayey rocks. The compositional difference of provenances was apparently caused by tectonic events in the oceanic basin at the Permian/Triassic boundary. |
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