山西省义兴寨金矿孙庄岩体磷灰石与角闪石的氧逸度计算  

Calculation of Oxygen Fugacity of Apatite and Amphibole in Sunzhuang Pluton of Yixingzhai Gold Deposit in Shanxi Province

作　　者：金咏洁 温书琪 王硕 李新宇 秦超 唐玉莹 张聚全 JIN Yong-jie;WEN Shu-qi;WANG Shuo;LI Xin-yu;QIN Chao;TANG Yu-ying;ZHANG Ju-quan(Hebei GEO University,Shijiazhuang 050031,China)

机构地区：[1]河北地质大学地球科学学院,河北石家庄050031

出　　处：《河北地质大学学报》2022年第4期13-19,共7页Journal of Hebei Geo University

基　　金：河北地质大学第十七届学生科技基金科研项目(KBG202101)。

摘　　要：山西省繁峙县义兴寨金矿是华北克拉通内部几个大型金矿之一,其与孙庄闪长质杂岩体存在密切的时空联系。研究通过对孙庄岩体中磷灰石和角闪石进行岩相学观察和电子探针分析,利用角闪石温压计、氧逸度计和磷灰石氧逸度计对成矿岩体的物理化学条件进行了计算。计算结果显示角闪石和磷灰石氧逸度计的结果相差不大,磷灰石矿物计算的氧逸度结果略高于角闪石的计算结果,测试数据皆位于HM和NNO缓冲线之间,表明孙庄岩体具有高氧逸度特征。孙庄岩体的高氧逸度有利于金的活化迁移和富集成矿,是义兴寨大型金矿形成的重要控制因素。Yixingzhai gold deposit in Fanshi County,Shanxi Province is one of several large gold deposits in North China Craton,which has a close relationship in time and space with Sunzhuang pluton.In this study,through the petrographic study and electron microprobe analysis of apatite and amphibole in Sunzhuang pluton,the physical and chemical conditions of ore-forming rocks were calculated by amphibole thermobarometers,amphibole oxygen fugacity meter and apatite oxygen fugacity meter.It is found that there is little difference in the results of amphibole and apatite oxygen fugacity meters.The oxygen fugacity calculated by apatite mineral is slightly higher than of amphibole.All of the results plot between HM and NNO buffer lines,it is clear that the Sunzhuang pluton shows high oxygen fugacity.The high oxygen fugacity of the Sunzhuang pluton possibly favored gold enrichment and transport ore-forming fluid,which played an important role in large gold deposits in the formation of Yixingzhai gold deposit.

关 键 词：义兴寨金矿 磷灰石 角闪石 氧逸度 

分 类 号：P571[天文地球—矿物学]