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Comparison between deep-sea hydrothermal deposits recovered from recent spreading ridges ArchiMer
Hekinian, Roger; Fevrier, M..
Deep-sea hydrothermal deposits from the accreting plate boundaries of the Rift valley in the gulf of Aden of the Galapagos spreading center of the Rift valley on the Mid-Atlantic Ridge near 26° North and from Transform fault "A" on the Mid-Atlantic Ridge near 37° North are studied and compared. Two main types of products are found occurring in all these areas.1 ) Dark-brown Fe-Mn concretions made up essentially of todorokite and birnessite and 2) A variegated clay-rich material composed mainly ol Fe-Si-rich smectite.In general the textural appearance, the mineralogy and the chemistry of the hydrothermal maicrial from the various localities are similar. Secondary alteration products found in basaltic rocks are compared with the clay-rich material from the...
Tipo: Text Palavras-chave: Histoire Ifremer.
Ano: 1979 URL: http://archimer.ifremer.fr/doc/1979/publication-5265.pdf
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