Pt-bearing phases in ocean Mn-Fe crusts on basalts
Pt-bearing phases in ocean Mn-Fe crusts on basalts
N.S. Rudashevsky, Yu.L. Kretser, L.I. Anikeeva, S.I. Andreev
Pacific ocean, 19°38’ N.l., 175°48’ W.l.
Weight of sample - 300 g
(wt.%): Mn 24.2 Fe 12.6 Ni 0.59 Co 0.72 Cu 0.13
(ppm): Pt 0.35 Pd 0.0052 Au 0.005 Ce 1180 La 190
Heavy mineral phases:
1) oxides — wustite+magnetite, ilmenite, titanium magnetite, chromite, zircon, unnamed ZrAl2O5;2) sulphides — pyrite, chalcopyrite, sphalerite, chalcosine, bornite, heazlewoodite, molybdenite, tennantite and galena;
3) native metals — native iron, nickel, taenite, copper, brass, bronz and lead;
4) other minerals — goethite, apatite, barite, bastnasite-(Ce)
Mineral parageneses:
1) matrix-minerals — Mn-Fe hydroxides, goethite, apatite, barite;2) minerals from basalts — ilmenite, titanium magnetite;
3) cosmic minerals — microspheres of wustite+ magnetite+ taenite;
4) voletile fluid minerals — all native metals, sulphides etc.
Pt-bearing phases of ocean Mn-Fe crusts on basalts; heavy concentrate, SEM images (BIE).
HOX — (Fe,Mn) — Fe-Mn hydroxides; BRS — native brass (Cu,Zn,Sn); BRNZ — native bronz (Cu,Sn,Zn,Ag), AP — apatite, RSB — rustenburgite, Fe3Si, Fe2Si, Fe5Si3, (Cu,Pt)5Si and (Cu,Pt)4Si — unknown phases.
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