Geochemistry of magmatic rocks of the Koksharovka alkaline-ultrabasic massif,primorye, and results of trace-element modeling |
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| Authors: | R A Oktyabrsky A A Vrzhosek A M Lennikov T A Yasnygina S V Rasskazov E Yu Moskalenko T A Velivetskaya |
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| Institution: | (1) Far East Geological Institute, Far East Division, Russian Academy of Sciences, Vladivostok, Russia;(2) Institute of the Earth’s Crust, Siberian Division, Russian Academy of Sciences, Irkutsk, Russia |
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| Abstract: | New geochemical data are presented on the magmatic rocks of the Late Jurassic Koksharovka alkaline-ultrabasic massif, which is associated with deposits of vermiculite, apatite, V-bearing titanomagnetite, and placer isoferroplatinum. The REE geochemistry and strontium, oxygen, and carbon isotopic composition of carbonatites and related ijolites and pyroxenites, together with geological observations, point to the magmatic origin of the Koksharovka carbonatites. The origin of associated magmatic rocks is discussed. Trace element modeling of partial melting of mantle sources was conducted to decipher the genesis of the melts of the Koksharovka carbonatites and host titanite-kaersutite pyroxenites. |
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| Keywords: | alkaline-ultrabasic rocks carbonatites rare-earth element geochemistry Koksharovka Primorye |
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