An iron-rich deposit from the Northeast Pacific

Details An iron-rich deposit from the Northeast Pacific An iron-rich deposit from the Northeast Pacific

May 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975e%26psl..26..114p&link_type=abstract

Earth and Planetary Science Letters, Volume 26, Issue 1, p. 114-120.

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Scientific paper

An iron-rich deposit dredged from the upper flank of Dellwood Seamount in the Northeast Pacific has been analyzed for major and trace elements, rare-earth contents and uranium isotopic composition. In terms of mineralogy and overall chemical composition, the deposit resembles other iron-rich deposits variously attributed to volcanic hydrothermal activity. Both the relative concentrations of the rare-earth elements and the isotopic composition of uranium rule out seawater as the sole source of elements in this deposit. The rare-earth element pattern indicates that these elements were derived from the underlying basalt. The 234U/238U ratio is significantly higher than in seawater and can best be explained by preferential leaching of 234U generated by decay from its parent 238U in the underlying rock and subsequent redeposition of the excess 234U together with the Fe and minor metals. These data are consistent with a model for the origin of submarine metal-rich solutions involving mobilization of elements from the interior of slowly cooling basalts by circulating seawater.

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