Nontronite from a low-temperature hydrothermal system on the Juan de Fuca Ridge

Details Nontronite from a low-temperature hydrothermal system on the Juan de Fuca Ridge Nontronite from a low-temperature hydrothermal system on the Juan de Fuca Ridge

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..65..343m&link_type=abstract

Earth and Planetary Science Letters, Volume 65, Issue 2, p. 343-352.

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Scientific paper

A deposit of Fe-rich, Al-poor, hydrothermal nontronite was recovered from the Juan de Fuca Ridge. Analyses show the deposit to be mineralogically and chemically similar to nontronite described at other oceanic localities. The deposit is located near the tip of a propagating segment of the Juan de Fuca Ridge. Rare earth elements and Sr isotopes indicate that the nontronite precipitated from seawater. A formation temperature of 57°C is suggested by oxygen isotopic composition. The low-temperature nontronite deposits apparently form from newly established hydrothermal systems associated with the propagating rift segment. More mature hydrothermal systems that deposit sulfide on the seafloor may develop from these low-temperature systems.

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