Dissolution of radiation-damaged zircon in lateritic soils
作者： S. Delattre , S. Utsunomiya , R. C. Ewing , J.-L. Boeglin , J.-J. Braun
DOI: 10.2138/AM.2007.2514
关键词:
摘要: Zircon crystals from lateritic soils at Nsimi, Cameroon, were investigated using electron microprobe analysis (EMPA), transmission microscopy (TEM), scanning (SEM), and Raman spectroscopy to determine the extent of radiation damage alpha-decay events. The belong a small watershed developed on granitic rocks Congo craton (2.9 Ga). Interactions with fluids are evidenced by significant CaO (up 1.5 wt%), Al2O3 2.9 Fe2O3 wt%) concentrations in UO2 rich regions (0.05 1 zircon. Regional heating up 500 °C, related Pan-African orogeny about 0.6 Ga ago, has lead recrystallization radiation-damaged grains formation nanoporous microstructure. correlation observed between presence dissolution features actual state zircon shows that occurs under tropical weathering conditions preferential highly regions. Congruent limited mobility Zr supported absence zirconium oxide precipitates fractures weathered
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