Mineral Chemistry and Boron Isotopic Composition of Tourmaline from the Devonian Metallogenic District of Shanyang-Zhashui,Eastern Qinling  

作　　者：薛春纪 蒋少涌 李延河 

出　　处：《Chinese Journal Of Geochemistry》1997年第3期248-255,共8页中国地球化学学报

摘　　要：Tourmaline is widespread in the host strata of strata-bound base metal sulphide de-posits in the Devonian metallogenic district around Shanyang-Zhashui in eastern Qinling. As amember of the schorl-dravite series, the tourmaline is characterized by Mg>Fe and Na > Ca,showing apparent chemical zonation which records the geochemistry during its formation andsubsequent regi0nal metamorphism and hydrothermal overprint. The close similarity in chemi-cal and isotopic constitutions between the tourmaline of the main metallogenic epoch in this district [FeO/(FeO+MgO) = 0. 34 - 0. 39 andδ 11B = - 7. 6‰. - - 8. 8‰] and those related tomassive sulphide deposits typical of submarine (exhalative) hydrothermal sedimentation mayadd further support to a similar mechanism of mineralization for the strata-bound deposits in thedistrict.Tourmaline is widespread in the host strata of strata-bound base metal sulphide de-posits in the Devonian metallogenic district around Shanyang-Zhashui in eastern Qinling. As amember of the schorl-dravite series, the tourmaline is characterized by Mg>Fe and Na > Ca,showing apparent chemical zonation which records the geochemistry during its formation andsubsequent regi0nal metamorphism and hydrothermal overprint. The close similarity in chemi-cal and isotopic constitutions between the tourmaline of the main metallogenic epoch in this district [FeO/(FeO+MgO) = 0. 34 - 0. 39 andδ 11B = - 7. 6‰. - - 8. 8‰] and those related tomassive sulphide deposits typical of submarine (exhalative) hydrothermal sedimentation mayadd further support to a similar mechanism of mineralization for the strata-bound deposits in thedistrict.

关 键 词：电气石 矿物化学 硼同位素 秦岭地区 泥盆纪 金属矿物分布 

分 类 号：P578.953[天文地球—矿物学]