Core participation in mantle geochemistry: Geochemical Society Ingerson Lecture, GSA Denver, October 1999

摘要: Abstract The siderophile element problem in mantle geochemistry has not been solved by treating the as residue of core formation a closed system. Conventional solutions to involve addition new material late accretions from outer space. However more solution options are open if can return little inside. notion that such flux is occurring suggested correlated anomalies 186Os/188Os and 187Os/188Os seen some plume materials R. J. Walker his colleagues et al 1995 , 1997 Brandon 1998 1999 . These isotopic could result 190Pt 187Re decay liquid following Pt-Re-Os fractionation during crystallization solid inner core. Partition coefficients determined for solid/liquid metal Pt, Re, Os at 100 kbar consistent with those required produce isotope anomalies. Oxide exsolution cooling saturated provides mechanism reimplant signal back into mantle. Other elements may have their abundances boosted this process. details reimplantation process present worthy challenge evaluation.