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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 a member 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 and subsequent 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 and δ 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.