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Sources and evolution of the Cenozoic suprasubduction magmatism of the Olyutorsky tectonic block, southern Koryak highland

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Abstract

This paper reports the results of an investigation of the geochemical and isotopic compositions of rocks formed during the Eocene suprasubduction magmatism in the Olyutorsky tectonic block. The contribution of various suprasubduction components to the formation of magmatic melts was estimated; the characteristics of the Eocene and Miocene-Quaternary suprasubduction magmatism of the Olyutorsky tectonic block were compared; and relations of the Cenozoic magmatism to the tectonic development of the block were evaluated. The Eocene-early Oligocene suprasubduction magmas were derived from geochemically and isotopically heterogeneous garnet lherzolites in a mantle wedge. The initially depleted lherzolites of the mantle wedge were probably locally and variably enriched by OIB-type mantle melts before the generation of island-arc magmas and then again depleted below the MORB level by the extraction of magmatic materials from them. In the Eocene, a considerable amount of quartz-feldspar sediments enriched in radiogenic Nd was consumed in the subduction zone, which resulted in a strong contamination of magmas derived from the garnet lherzolites of the mantle wedge. The later stages of subduction were accompanied by active generation of adakite magmas with depleted Nd isotope signatures and HFSE-rich melts showing no evidence for their contamination by sialic sediments. It was supposed that the Late Cenozoic subduction zone plunged northward beneath the Olyutorsky tectonic block. It was shown that the established characteristics of the suprasubduction magmatism of the Olyutorsky tectonic block could be related to Cenozoic spreading processes in the proto-Komandorsky basin of the Bering Sea.

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Authors and Affiliations

  1. Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry (IGEM), Russian Academy of Sciences, Staromonetnyi per. 35, Moscow, 119017, Russia

    D. V. Kovalenko

  2. Geological Institute, Kola Research Center, Russian Academy of Sciences, ul. Fersmana 14, Apatity, Murmanskaya oblast, 184200, Russia

    T. B. Bayanova

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Correspondence to D. V. Kovalenko.

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Original Russian Text © D.V. Kovalenko, T.B. Bayanova, 2007, published in Petrologiya, 2007, Vol. 15, No. 6, pp. 645–670.

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Kovalenko, D.V., Bayanova, T.B. Sources and evolution of the Cenozoic suprasubduction magmatism of the Olyutorsky tectonic block, southern Koryak highland. Petrology 15, 599–622 (2007). https://doi.org/10.1134/S0869591107060057

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