This damage is most concentrated around the parent isotope (U and Th), expelling the daughter isotope (Pb) from its original position in the zircon lattice.
In areas with a high concentration of the parent isotope, damage to the crystal lattice is quite extensive, and will often interconnect to form a network of radiation damaged areas.
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Where crystals such as zircon with uranium and thorium inclusions do not occur, uranium-lead dating techniques have also been applied to other minerals such as calcite/aragonite and other carbonate minerals. Poderá publicar a sua ficha, fazer as pesquisas, enviar e receber as mensagens e tudo isso completamente grátis, não temos quaisquer serviços pagos. At first although, I keep in mind being to shy to ask.If a series of zircon samples has lost different amounts of lead, the samples generate a discordant line.The upper intercept of the concordia and the discordia line will reflect the original age of formation, while the lower intercept will reflect the age of the event that led to open system behavior and therefore the lead loss; although there has been some disagreement regarding the meaning of the lower intercept ages.