摘要
斯克瑞斯斑岩型铜矿位于希腊北部哈尔基迪基半岛,塞尔维亚马其顿成矿带。矿体赋存于侵入到韦尔蒂斯科斯组的古近纪—新近纪碱性岩体中,岩体的分布受深部断裂影响。截至2011年,斯克瑞斯矿床已开采5.2×108t铜,Cu平均品位为0.5%,Au平均品位为0.8×10-6,Pd平均品位为110×10-9,Pt平均品位为17×10-9。铜-金矿化呈脉状、网脉状及浸染状分布于岩体及围岩中。矿石矿物主要为黄铜矿、斑铜矿、黄铁矿等,与矿化有关的围岩蚀变主要有钾长石化、硅化、青磐岩化、绢云母化等。锆石U-Pb年龄、全岩Ar-Ar年龄和矿床地球化学特征均显示,岩浆侵位与成矿作用之间关系密切,其形成时代约为19Ma。该矿床以Pd-Pt含量较高为特征。对斯克瑞斯斑岩型富铂族元素斑岩铜矿特点及成矿规律的系统总结,可以为在中国境内寻找同类矿床提供参考。
The Skouries porphyry deposit is located in Chalkidiki peninsula, Serbo-Macedonian metallogenic belt. It is hosted in alkaline rocks which intruded in Vertiskos units in Paleogene- Neogene. The distribution of intrusions is controlled by StratoniVarvara and Megali Panaghia-Gomati deep fault. The deposit contains more than 5.2×10^8t copper with Cu 0.5%, Au 0.8×10^-6, Pd110×10^-9and Pt 17×10^-9. Mineralization of the deposit mainly consists of vein type, stockwork type and dissemination type, and occurs in the altered porphyry and country rocks. Ore minerals mainly include chalcopyrite, bornite, pyrite and magnetite. Alterations related to mineralization are mainly potassic alteration, propylitization and silicification. Considering the consistency of U-Pb age of zircon and Ar- Ar age of whole rock, and the characteristics of petrology and geochemistry, it is concluded that the emplacement of the Paleogene-Neogene intrusions played an important role in the ore-forming process, and the deposit was formed at 19 Ma. It is worth noticing that the deposit has high content of Pd-Pt. And there are also some reports on PGE enrichment in porphyry Cu deposits in China, such as Dexing and Yulong. Therefore, the investigation of the characteristics and the metallogenic regularity of the Skouries deposit summarized in this paper will offer valuable reference for the exploration of the similar deposits in China.
出处
《地质通报》
CAS
CSCD
北大核心
2015年第6期1203-1216,共14页
Geological Bulletin of China
基金
中国地质调查局项目(编号:12120115065901
12120115068701
1212011120326)
