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Como escolher as amostras ideais para a datação por U-Th?
A análise por U-Th é usada para datar amostras que contenham carbonato de cálcio
(CaCO3). Porém, amostras do tipo sistema fechado são mais adequadas do que as de
sistema aberto.
Amostras de sistema fechado: menos suscetíveis a trocas elementais, já que não
permitem a infiltração de água e outras matérias na estrutura da amostra, o que
resulta em datações de maior certeza.
Exemplos: espeleotemas, corais
Amostras de sistema fechado: permitem a incorporação e lixiviação de matéria que
impacta a assinatura de urânio e tório, o que resulta em datações de menor certeza.
Exemplos: ossos, sedimentos lacustres e conchas*
* Observação: sedimentos lacustres e conchas são considerados sistemas parcialmente abertos
Perguntas sobre a datação por U-Th?
Contate nossa equipe
Assista o nosso webinar gratuito sobre datação por U-Th sob demanda.
Assuntos de interesse:
Suposições sobre a datação por U-Th
Seleção de amostras ideais
Tipos e seleção de amostras

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How to Select Optimal Samples for U-Th Dating (Portuguese)

  • 1. Como escolher as amostras ideais para a datação por U-Th? A análise por U-Th é usada para datar amostras que contenham carbonato de cálcio (CaCO3). Porém, amostras do tipo sistema fechado são mais adequadas do que as de sistema aberto. Amostras de sistema fechado: menos suscetíveis a trocas elementais, já que não permitem a infiltração de água e outras matérias na estrutura da amostra, o que resulta em datações de maior certeza. Exemplos: espeleotemas, corais Amostras de sistema fechado: permitem a incorporação e lixiviação de matéria que impacta a assinatura de urânio e tório, o que resulta em datações de menor certeza. Exemplos: ossos, sedimentos lacustres e conchas* * Observação: sedimentos lacustres e conchas são considerados sistemas parcialmente abertos Perguntas sobre a datação por U-Th? Contate nossa equipe Assista o nosso webinar gratuito sobre datação por U-Th sob demanda. Assuntos de interesse: Suposições sobre a datação por U-Th Seleção de amostras ideais Tipos e seleção de amostras