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矿床地质  2009 

陕西几类重要铅锌矿床的矿物微量元素和稀土元素特征

Keywords: 地球化学,微量元素,稀土元素,闪锌矿,铅锌矿床,陕西

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Abstract:

文章将陕西铅锌矿分为海底喷气沉积型(即SEDEX型)、与海底喷气沉积_改造作用有关的类SEDEX型和MVT型3类。对马元(MVT型)、南沙沟和江坡(类SEDEX型)、铅硐山和二里河(SEDEX型)铅锌矿床中的闪锌矿等矿物进行的微量元素和稀土元素测定结果表明,3类矿床各具特点:马元铅锌矿床闪锌矿的Co、Ni、Th、Y含量较低,而Mo、Cs、Sr、Ba、Tl含量较高;南沙沟和江坡铅锌矿床闪锌矿的Sn、Sb、W含量较低,而Mn、Y、Zr、In含量较高;铅硐山和二里河铅锌矿床闪锌矿的Li、Zr、Cs、Ba含量较低,而W含量较高;在闪锌矿Li-Cs、Zr-In、W-Sn、ΣREE-δEu、δEu-δCe散点图上,5个矿床的投点按上述3类分别集中。但铅硐山和二里河铅锌矿床与南沙沟和江坡铅锌矿床具有更多的相似性,而与马元铅锌矿床差异较大:在闪锌矿Sr-Ba、Co-Ni、Th-Y、Mo-Tl散点图上,马元的投点集中于一处,而其他4个矿床的投点集中于另一处;马元闪锌矿具有十分明显的铕正异常,而南沙沟、江坡、铅硐山和二里河闪锌矿铕异常不明显,或具有负铕异常;5元素矿床闪锌矿稀土元素配分曲线均为轻稀土元素稍富集的右倾型,但马元的稀土元素总量明显低于其他4个矿床。

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