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矿床地质  2005 

新疆尾亚钒钛磁铁矿——一个岩浆分异_贯入_热液型复成因矿床

Keywords: 地质学,碱性辉长岩,钒钛磁铁矿,岩浆分异_贯入,岩浆热液,尾亚

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Abstract:

由于特殊的矿化组合与大地构造环境,尾亚地区向来为研究东天山地区的地质学家所重视,然而关于尾亚矿床本身的研究尚不多见,本文试图对该矿床的地质特征和成因做一初步剖析,以期抛砖引玉,弥补东天山地区矿床研究的空缺。在详细的野外地质工作基础上,系统归纳整理了该矿床的地质特征,通过对矿石特征的研究,厘定了矿床的3个主要矿化阶段:岩浆结晶分凝阶段(形成似层状、浸染状和块状矿石)、贯入阶段(形成贯入式块状矿石)和岩浆热液阶段(形成伟晶状矿石)。对含矿岩石和矿石矿物进行了地球化学研究,计算出成矿的物理化学条件。含矿辉长岩的成岩温度为1296~1009℃,压力为296MPa左右,氧逸度为10-5.62~10-7.43;成矿温度(硫化物)为571~449℃,硫逸度为10-19.35~10-19.77。该矿床属于与碱性超镁铁质-镁铁质杂岩有关的岩浆型矿床;矿床形成以岩浆分凝和贯入式为主,晚期出现少量岩浆热液作用,为一岩浆分异-贯入-热液型复成因矿床。

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