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Minerals Report - International Seabed Authority

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A.<br />

B.<br />

C.<br />

Mn<br />

FSM-Palau<br />

Marshall Islands<br />

NW of Marshall Islands<br />

Johnston Island<br />

California Borderland<br />

Far North Pacific Ocean<br />

Shatsky Rise<br />

C + S Continental margin<br />

Atlantic Ocean<br />

Indian Ocean<br />

P x 10 Al x 10<br />

(Co+Ni+Cu) x 10<br />

Fe Mn<br />

(Co+Ni+Cu) x 10<br />

Fe Mn<br />

FSM-Palau<br />

Marshall Islands<br />

NW of Marshall Islands<br />

Johnston Island<br />

California Borderland<br />

Far North Pacific Ocean<br />

Shatsky Rise<br />

C + S Continental margin<br />

Atlantic Ocean<br />

Indian Ocean<br />

Pacific Ocean, n=400<br />

Atlantic/Indian Ocean, n-39<br />

Figure 8. (A) Mn-Px10-Alx10 ternary diagram for mean compositions of USGS data listed<br />

in Table 7; note that crusts from all areas except the Marshall Islands have about the same<br />

relative amounts of P, but highly variable relative amounts of Al and Mn depending on<br />

proximity to continental margins for Al and to the equatorial Pacific for Mn;<br />

(B) Mn-Fe-(Co+Ni+Cu)x10 ternary diagram after Bonatti et al. (146) for data as in (A);<br />

Note that crusts in proximity to continental margins and volcanic arcs are relatively<br />

enriched in Fe and depleted in trace metals, whereas central Pacific crusts are relatively<br />

enriched in Mn and trace metals, with the Johnston Island and Marshall Islands crusts<br />

showing the greatest enrichments; (C) Complete data set used in the means in B.<br />

INTERNATIONAL SEABED AUTHORITY 222

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