The crust granites have higher lead isotope ratios and are richer in uranium lead but poorer in thorium lead.
壳型花岗岩具较高的铅同位素比值和富铀铅贫钍铅的特点；
Like I said before, Uranium-Lead Dating has been with us for a while.
就像我之前说到的，铀铅年代测定法已经存在一段时间了。
Because of this, this new way of doing Uranium-Lead Dating, we've been able to determine that one of our major assumptions about the Grand Canyon was wrong.
因为有这种新的铀铅定年方法，我们才得以确定我们对大峡谷的一个主要假设是错误的。
In this case, Uranium-Lead Dating was used to establish that half of the sandstone in the samples was formed at the same time the granite in the Appalachian Mountains was formed.
在这种情况下，铀铅定年法被用来确定样本中一半的砂岩是在阿巴拉契亚山脉花岗岩形成的同时形成的。
There are a few pretty exciting possibilities for Uranium-Lead Dating.
铀-铅年代测定法有一些相当令人兴奋的可能性。
I'll predict that Uranium-Lead Dating is going to become an increasingly popular dating method.
我预测铀-铅年代测定法将会成为一种越来越流行的年代测定方法。
Most famously, uranium-238 decays into lead-206 with a half life of 4.5 billion years, though radioactive rubidium and samarium are also useful for dating things billions of years old.
最为有名的就是铀- 238衰变为铅- 206的半衰期为45亿年，当然放射性铷和钐也同样对测算几十亿年前的物体的年龄很有用。
The Rocky Mountains are littered with ghost towns that were once thronged with men mining silver, lead or uranium.
落基山脉一度涌入大批的采矿者，进行银矿，铅矿以及铀矿的开采活动，而现在已经是遍布垃圾，沦为城市的废墟。
Secular disequilibrium of uranium can lead to erroneous results.
铀的永久不平衡会导致错误的结果。
When the uranium disintegrates, it changes into lead.
当铀蜕变时，它变成了铅。
Underground deposits of lead, zinc, cryolite, chromium, coal, tungsten, molybdenum, iron, nickel, uranium and oil resources, which has basically taken cryolite end.
地下蕴藏铅、锌、冰晶石、铬、煤、钨、钼、铁、镍、铀和石油等资源，其中冰晶石已基本采完。
At the scene of the fire, toxic substances such as benzene, lead, uranium and asbestos can be inhaled or absorbed through the skin.
在火灾现场，象苯、铅、铀和石棉等有毒物质会通过呼吸或皮肤被吸收。
Apart from the diamonds and oil for which Angola is famous, Angola also has many other mineral deposits such as gold, copper, lead and uranium.
除了钻石和石油以外，安哥拉还盛产其它多种矿物，如黄金、铜、铅以及铀。
When the uranium disintegrates, it changes into lead .
当铀蜕变时，它变成了铅。
Natural Resources: Coal, gold, tungsten, lead, copper. uranium.
自然资源：煤、金、钨、铅、铜、铀。
On the basis of principle of uranium-lead isotope system evolution, the viewpoint of uranium mobilized mineralization has been proved;
根据铀-铅同位素体系演化原理论证了铀的活化成矿观点；
On the basis of principle of uranium-lead isotope system evolution, the viewpoint of uranium mobilized mineralization has been proved;
根据铀-铅同位素体系演化原理论证了铀的活化成矿观点；
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