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Extinct iodine 129 and trace elements in chondrites

1965; American Geophysical Union; Volume: 70; Issue: 21 Linguagem: Inglês

10.1029/jz070i021p05433

2156-2202

G. Turner,

Nuclear physics research studies

I-Xe formation intervals for the Bjurböle chondrite and the dark and light fractions of the Pantar meteorite have been measured by activation techniques with the correlated release method. On the basis of the uniform synthesis model the intervals obtained are (60±2), (68±3), and (60±8), m.y. The similarity of these and other recently measured values gives added confidence in the validity of the method. Other models of nucleosynthesis are considered. I, Te, Ba, Br, and Se abundances have also been obtained, and the light fraction of Pantar is found to be strongly depleted in I, Te, and Br with respect to both the dark fraction and the ordinary chondrites. Current ideas on the formation of the gas-rich meteorites are considered in the light of this evidence.