Microprobe analyses of rare earth element fractionation in meteoritic minerals

Details Microprobe analyses of rare earth element fractionation in meteoritic minerals Microprobe analyses of rare earth element fractionation in meteoritic minerals

Apr 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nimpb...3..677b&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section B, Volume 3, Issue 1-3, p. 677-680.

Physics

Scientific paper

Two meteorites were analyzed by PIXE with the Los Alamos nuclear microprobe. The enstatite achondrite Pen~a Blanca Spring and the ordinary chondrite St Severin were chosen as likely candidates for use in 244Pu (t1/2 = 82 my) cosmochronology and geochronology. These applications require the meteoritic minerals to have unfractionated actinides and lanthanides relative to ``cosmic'' elemental abundance ratios. The PIXE analyses produced evidence of actinide-lanthanide fractionation in Pen~a Blanca Spring oldhamite (CaS) whereas the St Severin phosphates, whitlockite and chlorapatite, do not exhibit this fractionation.

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