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铀-铅地质测年：U-238 → Pb-206 半衰期 = 45 亿年。对剩 80% U-238 的锆石，岩石年龄是多少？
铀-铅地质测年：U-238 → Pb-206 半衰期 = 45 亿年。对剩 80% U-238 的锆石，岩石年龄是多少？
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