因此，我们知道这种母同位素是在何时何处产生的，但尚不清楚它是如何产生的。

So we've known where and when the parent isotope was made, but not how it got here.

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综合岩石学、地球化学和同位素等方面的对比研究，笔者认为八大石闪长质包体属于同源包体，为寄主花岗岩同源母岩浆经结晶分异作用形成的早期产物。

Petrologic, geochemical and isotopic studies prove that the Badashi dioritic enclaves are autoliths and the earlier products generated by crystal fractionation of the host granite parental magma.

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采用气相色谱、色谱-质谱、同位素、红外光谱等方法，分析了长北油田原油的来源、母质类型的成熟度的高低。

Using gas chromatography, gas chromatography-mass spectrometry, carbon isotopes and infrared spectrometry to analyze the source, type and the maturity of crude oils in the Changbei oilfield.

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