塞尔维亚Mali Krivelj斑岩型铜矿床热液蚀变作用及元素迁移规律  

Hydrothermal alteration and elements migration features of Mali Krivelj porphyry copper deposit in Bor metallogenic belt,Serbia

作　　者：谭威 曾育龙 林明钟 曾兴宝 林荣添 郭红乐 TAN Wei;ZENG YuLong;LIN MingZhong;ZENG XingBao;LIN RongTian;GUO HongLe(Sino-Zijin Resources Ltd.,Beijing 100012,China;Serbia Zijin Copper Doo Bor,Longyan 364200,Fujian,China)

机构地区：[1]中色紫金地质勘查(北京)有限责任公司,北京100012 [2]塞尔维亚紫金铜业有限公司,福建龙岩364200

出　　处：《矿床地质》2023年第6期1266-1284,共19页Mineral Deposits

基　　金：紫金集团塞尔维亚波尔市Mali Krivelj铜矿补充勘查项目;塞尔维亚Bor-Majdanpek矿集区斑岩-浅成地温热液铜金多金属矿床成矿规律研究及靶区验证项目共同资助。

摘　　要：位于特提斯成矿域西段塞尔维亚Bor成矿带内的Mali Krivelj铜矿床是一大型斑岩型矿床。为揭示该矿床热液蚀变作用过程及元素迁移规律,文章对新鲜安山岩及不同蚀变带典型样品进行了微量元素分析及元素迁移质量平衡计算。研究结果表明,绢英岩化带及绿泥石-绢云母化带显示类似元素迁移规律,REE、Sr、Ba、Zr、Th、U、Ti、Co、Ni等元素显示一定程度迁出,而Rb、Cs等元素显示一定程度迁入,绿泥石-绢云母化带发育大量磁铁矿,而绢英岩化带则大量出现石英+绢云母+黄铁矿组合,这表明随着流体的持续演化,流体的还原性逐渐增强。青磐岩化带蚀变较弱,其元素迁移程度较低。研究区Cu与Cr、Rb、Ti/Sr、Rb/Ba、Cr/Zn比值等具较好的正相关性,Cu与REE、Ba、Zn、Mn、Sr等元素具有一定的负相关性,表明该矿床全岩元素迁移规律在一定程度上也能作为地球化学勘查指标为寻找斑岩矿化中心提供依据。The Mali Krivelj porphyry copper deposit is located in the Bor metallogenic belt in the western segment of the Tethyan metallogenic domain.Typical samples of fresh andesite and rocks in different alteration zones are collected for the trace element testing and element mass-balance calculation to research the hydrothermal alteration and elements migration during mineralization.The analytical results show that the phyllic zone and the chloritesericite alteration zone have similar elemental migration laws,Sr,Ba,Zr,Th,U,Ti,Co,Ni and REE elements emigrate in a certain degree,while Rb,Cs and other elements migrate in a certain degree,a large number of magnetite develops in the chlorite-sericite zone,while a large number of quartz+sericite+pyrite occur in the phyllic zone.All of these show that the fluid reducibility gradually increases with the continuous evolution of the fluid.The alteration in propylitic zone is weak,and the overall elemental migration is not high.Cu has a good positive correlation with Cr,Rb,Ti/Sr,Rb/Ba and Cr/Zn,and a certain degree of negative correlation with REE,Ba,Zn,Mn and Sr,which indicates that the whole rock element migration law of porphyry deposits can also be used as geochemical exploration indicators to a certain extent,and provides support for finding porphyry mineralization center.

关 键 词：斑岩型矿床 热液蚀变作用 元素迁移 Isocon分析 Bor成矿带 

分 类 号：P595[天文地球—地球化学] P618.41[天文地球—地质学]