Mesozoic sandstones and the reconstruction of tectonic depositional environments in the Bureya sedimentary basin in the Far East |
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Authors: | S A Medvedeva |
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Institution: | 1. Kosygin Institute of Tectonics and Geophysics, Far East Branch, Russian Academy of Science, ul. Kim Yu Chena 65, Khabarovsk, 680000, Russia
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Abstract: | The early Jurassic-Early Cretaceous tectonic environments were reconstructed for the first time on the basis of the study of sandstones from the Soloni-Urgal interfluve (Bureya sedimentary basin, Far East). The mineralogical-petrographic and lithochemical studies revealed that the sandstones are mostly quartz-feldspathic and feldspathic graywackes of acid composition with less common litites, graywacke arkoses, and arkoses. It was shown that the Lower-Middle Jurassic sediments were formed in active continental margin and continental volcanic arc settings, while the Upper Jurassic-Lower Cretaceous sediments were accumulated in a passive continental margin setting. Orogenic events in the Toarcian-Aalenian, Late Bajocian, and Late Oxfordian-Kimmeridgian led to sedimentation gaps. |
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