Mineral Chemistry and Boron Isotopic Composition of Tourmaline from the Devonian Metalloge

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

无

【期刊名称】《中国地球化学学报：英文版》 【年(卷),期】1997(016)003

【摘要】Tourmaline is widespread in the host strata of strata-bound base metal sulphide deposits in the Devonian metallogenic deistrict 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

regional

metamorphism and hydrothermal overprint.The close similarity in chemical and isotopic constitutions between the tourmaline of the main metallogenic epoch in this district [FeO/(FeO_MgO)=0.34-0.39and δ11B=-7.6‰--8.8‰] and those related to massive sulphide deposits typical of submarine(exhalative)hydrothermal sedimentation may add further support to a similar mechanism of mineralization for strata-bound depostis in the district. 【总页数】8页(248-255)

【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 【作者】无