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    • Determination of rare earth and refractory trace element abundances in early solar system objects by ion microprobe

      S Sahijpal K K Marhas J N Goswami

      Volume 112 Issue 4 December 2003 pp 485-498

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jess/112/04/0485-0498

    • Keywords

       

      Rare earth element; ion microprobe; solar nebula; hibonite; carbonaceous chondrite

    • Abstract

       

      Experimental and analytical procedures devised for measurement of rare earth element (REE) abundances using a secondary ion mass spectrometer (ion microprobe) are described. This approach is more versatile than the conventional techniques such as neutron activation analysis and isotope dilution mass spectrometry by virtue of its high spatial resolution that allows determination of REE abundances in small domains (10-20 micron) within individual mineral phases. The ion microprobe measurements are performed at a low mass-resolving power adopting the energy-filtering technique (Zinner and Crozaz 1986) for removal and suppression of unresolved complex molecular interferences in the REE masses of interest. Synthetic standards are used for determining various instrument specific parameters needed in the data deconvolution procedure adopted for obtaining REE abundances. Results obtained from analysis of standards show that our ion microprobe may be used for determining REE abundances down to ppm range with uncertainties of ∼ 10 to 15%. Abundances of rare earth and several other refractory trace elements in a set of early solar system objects isolated from two primitive carbonaceous chondrites were determined using the procedures devised by us. The results suggest that some of these objects could be high temperature nebular condensates, while others are products of melting and recrystallization of precursor nebular solids in a high temperature environment.

    • Author Affiliations

       

      S Sahijpal1 K K Marhas2 3 J N Goswami2

      1. Department of Physics, Panjab University, Chandigarh - 160 014, India
      2. Physical Research Laboratory, Navrangpura, Ahmedabad - 380 009, India
      3. Max-Planck Institut fur Chemie, Cosmochemistry Division, Mainz - 55020, Germany

    • Dates

       
      Published
      December 2003
      Manuscript received
      13 February 2003
      Manuscript revised
      15 May 2003

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