Nd Isotope Composition in Single Chondrules from the Tieschitz (H3) Chondrite

Details Nd Isotope Composition in Single Chondrules from the Tieschitz (H3) Chondrite Nd Isotope Composition in Single Chondrules from the Tieschitz (H3) Chondrite

Sep 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995metic..30r.530k&link_type=abstract

Meteoritics, vol. 30, no. 5, page 530

Other

Chondrules, Isotopes, Neodymium, Meteorites, Tieschitz, Radionuclides, Strontium-146, Strontium-147

Scientific paper

Larger-than-average sized chondrules, separated from the Tieschitz (H3) chondrite (sample no. C793), were cleaned ultrasonically several times in double distilled ethanol, then rinsed in ultra clean water, dried, and weighed. The chondrules were then dissolved in a mixture of five parts HF and one part HClO4. An aliquot of 1/10 of the solution was spiked with a Nd tracer. A second aliquot of 2/10 of the solution was put aside. Nd and Sr were separated from the remaining solution by ion-exchange chromatography. The Nd isotopic composition was measured with a single collector thermal ionization mass spectrometer, utilizing NdO^+ ions. After correction for oxygen, the isotopic ratios were normalized to ^146Nd/^144Nd = 0.7219. The results are summarized in Table 1. So far we succeeded in measuring the contents and isotopic ratios of Nd in two individual chondrules. Both yielded a total of about 10 ng Nd each. The ^143Nd/^144Nd ratio of the two chondrules, however, differs from each other with one being close to the chondritic ratio and the second being non-chondritic with remarkably non-radiogenic Nd. In addition, the abundance of ^142Nd is also significantly different in each of these two chondrules. This may indicate the presence of live ^146Sm (half-life = 1.03*10^8 a) during the formation of the solid components, which aggregated into proto-chondrules.

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