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矿床地质  2005 

南秦岭志留系铅锌矿床中硅质岩岩石学及地球化学

Keywords: 岩石学,地球化学,硅质岩,热水沉积,志留系,南秦岭

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Abstract:

南秦岭泥盆系内产出的众多矿床中含有层纹条带状硅质岩_硅质板岩,对其成因的研究有助于查明矿床成因和确定区域找矿方向。研究表明,硅质岩化学成分纯净,SiO2含量多在90%以上。硅质岩中大部分微量元素含量低于地壳克拉克值,但富集Zn、Pb、As、Sb、Ag;硅质岩的Fe_Mn_(Cu+Ni+Co)×10图解表明硅质岩具热水沉积性质。硅质岩与矿石两者的稀土元素特点相似,具有ΣREE低(44.52×10-6)、轻重稀土分异较明显(LREE/HREE=6.51)、北美页岩标准化配分曲线呈平缓趋势、铈负异常不明显(δCe值为0.97)和铕正异常明显(δEu值为1.42)的特点;硅质岩的δ30Si为-0.5‰~0.0‰,δ18O为17.8‰~19.9‰,硅、氧同位素组成及形成温度(84~101℃)也暗示它为海底热水沉积成因。

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