The osmium isotopic composition of the continental crust

Osmium isotope systematics of ureilites

“…As pointed out in earlier work (Brandon et al, 2000;Esser and Turekian, 1993;Peucker-Ehrenbrink and Blum, 1998;Walker et al, 2002), terrestrial crustal materials typically have 187 Os/ 188 Os of ≥1, and widely varying, very high Re/Os. However, because of the relatively high concentrations of Os in the ureilite samples of 50 -1200 ppb (Table 1), combined with the low concentrations of Os in crustal rocks and minerals of <0.05 ppb, i.e.…”

Osmium concentrations and 187Os/188Os ratios of three sediment reference materials

“…Some proportion of Os in this reference material may be derived from an anthropogenic source, as described in the United States by Esser and Turekian (1993) in New Haven harbor and by Helz et al (2000) in Chesapeake Bay. Anthropogenic Os has a low isotopic ratio of about 0.14 (Esser and Turekian, 1993;Ravizza and Bothner, 1996), because Osbearing materials used for industry and vehicles originate from ore deposits with low 187 Os/ 188 Os. Our data thus may indicate that Os in Tokyo Bay sediments comes from a more radiogenic natural source released from weathered rocks and a less radiogenic anthropogenic source.…”

A method for determination of PGE–Re concentrations and Os isotopic compositions in environmental materials

“…1.69. 16 Commercial Os is mined from mantle-derived PGE deposits with high Os concentrations and low (i.e., unradiogenic) 187 Os/…”

“…17 A recent study on sediments from Massachusetts Bay, Cape Cod Bay, and Boston Harbor (all USA) reported background Os concentrations in the range of 22 Os ratios identify an anthropogenic input and thus can be used to trace the PGE source(s). 12,16,[19][20][21][22] The monitoring of Re will be especially important since to date virtually nothing is known about its behavior in the environment and its risk for humans.…”