山东七宝山金铜多金属矿区黄铁矿微量元素特征及其地质意义

七宝山金铜多金属矿区的钓鱼台硫铁矿床、金线头金铜矿床以及七宝山铅锌矿床,其矿化类型分别为似层状浸染型、隐爆角砾岩型、裂控热液脉型,黄铁矿是三类矿化中最发育的金属硫化物矿物。通过对3个矿床黄铁矿产状,晶体形态,主、微量元素的nS与nFe实际原子个数比图解(nS/nFe=1.985~2.066)、δFe与δS特征图解(δFe/δS=±5%)、δFe/δS-As图解、(Fe+S)-As图解、Co/Ni特征图解(Co/Ni=1.2~11;Co/Ni=2~27;0.7~18)、Co-Ni-As特征图解以及微量元素相关性[Se-Sb(0.528)、Se-Zn(0.371)、Zn-Sb(0.642)、Pb-Te(0.463)]等研究,得知3个矿床黄铁矿均受岩浆热液的影响,其成矿物质和岩浆作用密切相关,表明3类矿化黄铁矿均为与七宝山次火山杂岩体有关的中温热液型矿床。

Characteristics of trace elements of pyrite in Qibaoshan Au-Cu polymetallic deposit and its geological significance

The types of mineralization Diaoyutai pyrite deposit，Jinxiantou Au- - Cu deposit and Qibaoshan Pb- - Zn deposit． are homo- layered disseminated，cryptoexplosion breccia，and cleft- control hydrothermal pulse in type， respectively． The pyrites are the most developed metal sulfides in this area． Based on the study of the occurrence， crystal morphology and the diagrams of n S /n Fe (n S /n Fe =1. 985 ～2. 066)，δFe/δS (δFe/δS = ±5%)，δFe/δS － As，(Fe + S) － As，Co/Ni diagram，Co － Ni － As (Co/Ni =1. 2 ～11; Co/Ni =2 ～27; 0. 7 ～18) and correla- tion index of the trace elements［ Se － Sb (0. 528)，Se － Zn (0. 371)，Zn － Sb (0. 642)，Pb － Te (0. 463)］ ， etc． We conclude that the magmatic hydrothermal influences the three deposits，the metallogenic materials are closely related to the magmatism． The three kinds of pyrite are middle- temperature hydrothermal deposits which are related to the secondary volcanic complex of Qibaoshan．