Osmium geochemistry

U and U, and this is in part responsible for the more complex isotopic relationships displayed by lead isotopes in comparison with the systematics of strontium, neodymium, hafnium, and osmium isotopes. The mantle geochemistry of noble gases, although of course an integral part of mantle geochemistry, is treated in Chapter 2.06. 

Martiu C. E., Peucker-Ehrenbrink B., Brunskill G., and Szymezak R. (2001) Osmium isotope geochemistry of a tropical estuary. Geochim. Cosmochim. Acta 65(19), 3193-3200. 

Ravizza G. (1998) Osmium-isotope geochemistry of Site 959 implications for Re-Os sedimentary geochronology and reconstruction of past variations in the Os-isotopic composition of seawater. Proc. Ocean Drill. Prog., Sci. Res. 159, 181-186. 

Ravizza G., Turekian K. K., and Hay B. J. (1991) The geochemistry of rhenium and osmium in recent sediment from the Black Sea. Geochim. Cosmochim. Acta 55, 3741-3752. 

The platinum-group metals consist of ruthenium, rhodium, palladium, osmium, iridium, and platinum. Each of the metals occurs naturally in its native form, and in economically exploitable deposits the elements occur overwhelmingly as individual platinum-group mineral (PGM) species. Mutual substitution of the various PGE is common, but substitutions in other minerals, such as base-metal sulfides, typically occur to only a limited extent. A comprehensive review of PGM and PGE geochemistry is given by Cabri (2002). 

Hanghoj, K., Keleman, P. B., Bernstein, S., Blustz-TAJN, J. Frei, R. 2001. Osmium isotopes in the Weidemann Fjord mantle xenoliths, a unique record of cratonic mantle formation by melt depletion in the Archean. Geochemistry, Geophysics and Geosystems, 2, 85-92. 

Figure 2 Dissolved Cr(VI) (A) and Cr(lll) (B) in the eastern North Pacific Ocean, 23°N, 115°W. (Data from Murray JW, Spell B and Paul B (1983) The contrasting geochemistry of manganese and chromium in the eastern tropical Pacific Ocean. In Wong CS et al. (eds) Trace Metals in Seawater, NATO Conference Services 4 Marine Science vol. 9, pp. 643-668. New York Plenium Press.) (C) Dissolved rhenium in the eastern North Pacific Ocean, 9°46 N, 104°1TW. (Data from Woodhouse OB, Ravizza G, Falkner KK, Statham PJ and Peucker-Ehrenbrink B (1999) Osmium in seawater vertical profiles of concentration and isotopic composition in the eastern Pacific Ocean. Earth and Pianetary Science Letters 173 223-233.)...

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