Peculiarities of accessory zircon from the carter seamount tuffs (Sierra Leone Rise in the East Atlantic) |
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Authors: | V. V. Petrova S. G. Skolotnev N. I. Chistyakova |
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Affiliation: | 1.Geological Institute,Russian Academy of Sciences,Moscow,Russia;2.Fedorovskii All-Russia Scientific Research Institute of Minerals,Moscow,Russia |
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Abstract: | In volcanic tuffs, dredged during Cruise 23 of the R/V Akademik Nikolaj Strakhov, accessory zircon was found; except for the mineral-forming components, there were ∼2% of ThO2 and 0.75% of Ce2O3 in zircon. During rapid uplift of magmatic masses to the ocean bottom surface, admixture elements isolated into specific minerals. As a result, destruction structures were formed in the rim parts of primary zircon crystals, and the new-formed association of zircon + thorite + cerite + thoriante + baddeleyite appeared. |
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