Alpha particle distribution and uranium mechanisms of accumulation in fossilised shells of ammonites and bivalves
DOI:
https://doi.org/10.7494/geol.2025.51.1.89Słowa kluczowe:
Uran; Emitery Alpaha; Zapis kopalny; Fosylizacja; Fosfatyzacja; Radioaktywność;Abstrakt
Streszczenie:
Próbki skamieniałości (amonity i okazy małży) analizowano przy użyciu detektorów CR-39 i SEM. Emitery cząstek alfa były niemal równomiernie rozmieszczone w analizowanych skamieniałościach. Nie obserwujemy śladów skoncentrowanych tylko w określonych regionach, co może wskazywać na brak wysoce radioaktywnych ziaren mineralnych. Korelacja między zawartością fosforu a śladami alfa wskazuje, że pierwiastek ten był kluczowy w pochłanianiu radionuklidów, prawdopodobnie uranu lub innych pochodnych emiterów cząstek alfa. W tych badaniach przeprowadzono analizę potencjalnych mechanizmów akumulacji uranu w skamieniałym materiale. Związki organiczne obecne w osadach mogą wpływać na ruchliwość i retencję uranu. Interakcja pierwiastków obecnych w strukturze skamieniałości z uranem może zależeć od różnych czynników, takich jak pH płynów porowych, warunki redoks i specyficzna mineralogia osadów. Procesy te mogą prowadzić do powstawania złóż bogatych w uran w określonych warunkach geologicznych, a także mogą wpływać na dystrybucję i dostępność uranu jako zasobu lub potencjalnego zanieczyszczenia środowiska. Procesy diagenetyczne, wystęujące w obrębie skamieniałości, takie jak zmiany chemiczne i transformacje w skałach, mogą wpływać na migrację uranu. Dlatego w niektórych strukturach materiałowych stężenie uranu może się zmieniać.
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