Abstract
Cenozoic volcanic rocks were discovered on major rises of the inner Okhotsk Sea. In this paper, these rocks are geochemically typified, and the geodynamic conditions of their formation reconstructed. For this purpose, mineralogical and geochemical analyses as well as radioisotope age determinations were carried out. The radioisotope age determinations show that the Cenozoic volcanic rocks were formed during the Paleogene–Pleistocene. Within this period, Eocene and Plio-Pleistocene volcanic complexes are particularly prominent. Mineralogical and geochemical analyses show that the rocks belong to the calc-alkaline volcanic series. The Eocene volcanic rocks were formed under subaerial conditions, whereas the Plio-Pleistocene volcanics were formed under submarine conditions. The results of the study suggest that the Okhotsk Sea Basin was formed during the destruction of the Asian continental margin, the Eocene volcanism reflecting subaerial, the Plio-Pleistocene volcanism submarine stages of the Okhotsk Sea evolution.
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Acknowledgments
We thank B.N. Piskunov, K.F. Sergeev, and V.I. Harizhniy for providing the samples of Okhotsk Sea volcanic rocks. We are grateful also to E.P. Terekhov, I.A. Tararin, L.A. Izosov, R.G. Kulinich, and B.I. Karp for help in data processing and interpretation as well as consultation.
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Emel’yanova, T.A., Lelikov, E.P. & S’edin, V.T. Geochemical features of the Okhotsk Sea Cenozoic volcanism. Geo-Mar Lett 26, 275–286 (2006). https://doi.org/10.1007/s00367-006-0036-0
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DOI: https://doi.org/10.1007/s00367-006-0036-0