New data on the composition and age of rocks from the Bathymetrists Seamounts (Eastern margin of the equatorial Atlantic)


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The petrology, geochemistry, and isotope ratios of volcanics dredged during the 43rd cruise of R/V Academik Ioffe on the Bathymetrists Seamounts in the eastern equatorial Atlantic have been studied. These are alkaline volcanics of basic and ultramafic compositions. Spider diagrams of the trace elements of volcanic rocks demonstrate strong fractionation, indicating formation of their primary melts from an enriched mantle source at garnet depth facies. Considering the isotope ratio values of 143Nd/144Nd, 206Pb/204Pb, 207Pb/204Pb, 208Pb/204Pb, and 87Sr/86Sr and the character of their variations, the volcanic mantle source was chemically heterogeneous: for various volcanic rocks it was a mixture of the mantle components HIMU with EM–1 or EM–2. Limestones dredged together with the volcanics yielded microfossils suggesting a Middle Eocene age of their formation in a carbonate platform environment.

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S. Skolotnev

Geological Institute

编辑信件的主要联系方式.
Email: sg_skol@mail.ru
俄罗斯联邦, Moscow

A. Peyve

Geological Institute

Email: sg_skol@mail.ru
俄罗斯联邦, Moscow

M. Bylinskaya

Geological Institute

Email: sg_skol@mail.ru
俄罗斯联邦, Moscow

L. Golovina

Geological Institute

Email: sg_skol@mail.ru
俄罗斯联邦, Moscow

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