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赋存层控金属矿床的东秦岭中泥盆统中发育一类特殊岩石——方柱黑云岩。野外和室内研究表明,其为与火山及火山热卤水活动有关的地热异常海盆中的一种特殊沉积相。岩石学、矿物学、岩石化学、矿物化学及稀土元素特征也为其原岩经过卤水“浸泡”蚀变和埋藏热变质形成方柱黑云岩类的成因提供了令人信服的证据。据此,推测出秦岭中泥盆世层控金属矿床形成的地热异常背景。
A special kind of rock, the Fangqian black dolomite, is developed in the Middle Qinnian Middle Devonian of stratiform metallogenic deposits. Field and laboratory studies have shown that it is a special sedimentary facies in geothermal anomalies associated with volcanic and volcanic thermal brine activity. Petrology, mineralogy, petrochemistry, mineral chemistry and REE characteristics also provide convincing evidence that the original rocks were “steeply altered” by brine and buried metamorphicly to form a trellite-type biotite. Based on this, it is estimated that the background of geothermal anomalies formed by the Middle Devonian stratiform metallogenic deposits in the Qinling Mountains.