the low th and u content of the copper ores suggests that the pb isotopic compositions of this type of ores are normal lead instead of radiogenic lead.

  • 而且,铜矿石的低U、Th含量为该类铜矿石的铅是正常铅提供了合理的解释。

  • 互联网摘选 2026-07-13 13:40:05

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