Trace elements in primitive meteorites—VII Antarctic unequilibrated ordinary chondrites

Cadmium stable isotope cosmochemistry

“…6; Fig. 2 in Wang and Lipschutz, 2007) than geochemically similar but less volatile elements, such as Zn, Rb and K; (ii) isotope fractionation that is indicative for partial kinetic evaporation/condensation is also observed for the moderately volatile elements Zn and Ag (Luck et al, 2005;Schö nbächler et al, 2006), albeit to a much smaller extent. Clearly, comprehensive data sets for the Tl, In and perhaps Hg stable isotope compositions of (ordinary) chondrites would help to clarify this issue, but Tl and Hg are currently available only for carbonaceous chondrites (Lauretta et al, 2001;Baker et al, 2007).…”

“…In this regard, (early) impacts were potentially important for the generation of pathways for the highly volatile elements and shock heating perhaps assisted in the vaporization of these elements, as was suggested for the L chondrite parent body by Friedrich et al (2004) among others. Wang and Lipschutz (2007) observed that high Cd contents in unequilibrated ordinary chondrites generally coincide with the presence of carbide-magnetite-assemblages, which may have formed during hydrothermal alteration (Krot et al, 1997). They suggested that Cd in ordinary chondrites is first transported by fluids generated deeper in the parent bodies and then deposited during the formation of carbide-magnetite-assemblages.…”

“…Cadmium would subsequently be re-mobilized following metamorphic destruction of the carbide-magnetite-assemblages, ''possibly by the process suggested by Wombacher et al (2003)'', i.e., volatilization. Wang and Lipschutz (2007) argued that (i) Cd is the only element affected by this process, (ii) Cs and Rb are the only other elements redistributed by fluids and (iii) all other volatile element abundances in unequilibrated ordinary chondrites reflect primary nebular condensation and accretion. We concede that fluids and carbide-magnetite-assemblages may be involved in the redistribution of Rb, Cs and Cd.…”

Earth's moderately volatile element composition may not be chondritic: Evidence from In, Cd and Zn

“…The abundances of Zn, Rb and other volatile elements in the BSE are lower than in chondrites with comparable element ratios (Campbell and O'Neill, 2012;McDonough, 2014;McDonough and Sun, 1995;Palme and O'Neill, 2014), suggesting that the volatile elements in the main building materials of the Earth were more strongly depleted relative to known chondrites. The Mg, Zn, In and Rb contents of primitive chondrites used are: CI (Lodders, 2003), CM and CO (Friedrich et al, 2002), CV3 (Allende) (Jarosewich et al, 1987) and unequilibrated (petrologic type 3) enstatite and ordinary chondrites from (Kong et al, 1997;Wang and Lipschutz, 2005;Wang and Lipschutz, 2007) and some from the MetBase Meteorite Database (Koblitz, 2005). In cases where data sources lack Mg contents, Mg contents used for normalization are the mean values of the group of chondrites from Wasson and Kallemeyn (1988).…”

Silver isotope variations in chondrites: Volatile depletion and the initial 107Pd abundance of the solar system

“…Since Zn is more volatile than Ag, this cannot reflect volatility in the solar nebula. Ebihara et al, 1982;Lingner et al, 1987;Wolf et al, 1997;Wolf and Lipschutz, 1998;Friedrich et al, 2002;Wang and Lipschutz, 2007. ) Friedrich et al (2004) and references therein list in their volatile depletion sequence Ag much closer Zn than to Cu.…”