Geochemical Insights from Meteorites as Stars Plots
Explore geochemical insights from meteorites through plots comparing compositions of different meteorites. Understand the depletion of siderophile/chalcophile elements and the similarities to Earth's mantle. Discover the significance of considering different element studies in drawing conclusions about metallic cores.
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meteorites as stars Plots of log(1+2BE/SCZ) vs. Tc, where the BE has the composition of one of the nine meteorites from the Wasson-Kallemeyn 1988 paper. One set of plots has all 77 elements from WK, the other has only 30 elements from the BD18 study.
When the full 77 points of the WK study are displayed, there is a clear depletion of the sideropile/chalcophile elements for the L and LL chondrites. It would seem clear that the parent bodies of these meteorites formed a metallic core. It would be much harder to draw that conclusion if only the 30 elements of the BD18 study were available.
The geochemical separation of sidero/chalcophiles and lithophiles seen in meteorites resembles that seen in the earth s mantle, as shown on the right.
HD 196390: using Wang BE abunds. Left: From AJ, 161, 142, 2021, plot of Log(p + q*BE/SCZ) vs Tc for the 18 non-neutron addition elements from BD18. In that paper we show that for the present purposes the Tc valus from Wood or Lodders are equivalent. Model points are red crosses, observations C-Zn are large filled circles; neutron addition elements are small points. Right: Similar plot but substituting CM abundances from Wassen & Kallemeyn for Wang s bulk earth abundances. Symbols as on the right.
