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

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Description

Two meteorites were analyzed by PIXE with the Los Alamos Nuclear Microprobe. The enstatite achondrite Pena Blanca Spring and the ordinary chondrite St. Severin were chosen as likely candidates for use in /sup 244/Pu (t/sub 1/2/ = 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 Pena Blanca Spring oldhamite (CaS) whereas the St Severin phosphates, whitlockite and chlorapatite, do not exhibit this fractionation.

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Pages: 18

Creation Information

Benjamin, T.M.; Duffy, C.J.; Rogers, P.S.Z.; Maggiore, C.J.; Woolum, D.S.; Burnett, D.S. et al. January 1, 1983.

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Description

Two meteorites were analyzed by PIXE with the Los Alamos Nuclear Microprobe. The enstatite achondrite Pena Blanca Spring and the ordinary chondrite St. Severin were chosen as likely candidates for use in /sup 244/Pu (t/sub 1/2/ = 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 Pena Blanca Spring oldhamite (CaS) whereas the St Severin phosphates, whitlockite and chlorapatite, do not exhibit this fractionation.

Physical Description

Pages: 18

Notes

NTIS, PC A02/MF A01.

Source

  • 3. international conference on particle-induced X-ray emission (PIXE) and its analytical applications, Heidelberg, F.R. Germany, 18 Jul 1983

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  • Other: DE83017326
  • Report No.: LA-UR-83-2368
  • Report No.: CONF-830772-6
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/5693835 | External Link
  • Office of Scientific & Technical Information Report Number: 5693835
  • Archival Resource Key: ark:/67531/metadc1093280

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Creation Date

  • January 1, 1983

Added to The UNT Digital Library

  • Feb. 10, 2018, 10:06 p.m.

Description Last Updated

  • March 20, 2018, 6 p.m.

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Benjamin, T.M.; Duffy, C.J.; Rogers, P.S.Z.; Maggiore, C.J.; Woolum, D.S.; Burnett, D.S. et al. Microprobe analyses of rare-earth-element fractionation in meteoritic minerals, report, January 1, 1983; United States. (digital.library.unt.edu/ark:/67531/metadc1093280/: accessed July 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.