摘要
随着IOCG矿床不断取得巨大的勘探成果,IOCG矿床在国内外都日益受到关注。新疆乔夏哈拉铁铜金矿床在构造环境、元素组合、蚀变特征等方面与国外典型的IOCG矿床有相似之处,乔夏哈拉铁铜金矿床处于大陆边缘拉张环境,具有Fe-Cu-Au(-REE)多元素组合,蚀变以绿帘石矽卡岩化为主,垂直分带不明显;在成矿时代方面又区别于多数产在元古代的IOCG矿床,而是在古生代;乔夏哈拉西矿区切割铁矿层的闪长岩脉角闪石的Ar-Ar坪年龄为378.1±3.6Ma,故铁的成矿年龄应在泥盆纪。本文认为乔夏哈拉铁铜金矿床不仅与IOCG矿床有较多相似之处,与国内内蒙古白云鄂博铁稀土铌矿床、云南迤纳厂铁铜稀土矿床、云南拉拉铜铁金钴钼稀土矿床和云南稀矿山铁铜矿床等也有相似之处,因此,在中国寻找IOCG矿床尤其是大型矿床,是有可能的。
IOCG （Iron-oxide-copper-gold） deposits have been attracting more and more attentions at home and abroad, since more and more exploration fruits on IOCG deposits are obtained in the world. The Qiaoxiahala Fe-Cu- Au deposit is, to some extent, similar to typical IOCG deposits abroad on tectonic settings, element and mineral combinations and alteration features. The Qiaoxiahala Fe-Cu-Au deposit is located in an extensional setting of the continental margin and has a multiple elements combination of Fe-Cu-Au（-REE）. Its vertical zoning of alterations was not obvious, but epidotization skarn is the major alteration in those hot-water alterations. On metallogenie epoch, the Qiaoxiahala deposit was different from most IOCG deposits occurring in the Proterozoie, but in Paleozoie Era. The 40Ar/39 Ar plateau age of hornblende from diorite vein in the western Qiaoxiahala mining district is at 378.1 ± 3.6 Ma. Since this diorite vein cuts the magnetite layer, the iron mineralization might be completed in the Devonian. Through more comparisons between the Qiaoxiahala and other IOCG deposits in China, such as the Bayan Obo Fe-REE-Nb deposit in Inner Mongolia, Yinaehang Fe-Cu-REE deposit, Lala Fe-Cu-Au-Co-Mo-REE depos- it and Xikuangshan Fe-Cu deposit in Yunnan, it＇s promising to explore more IOCG deposits in China, especially those IOCG deposits at large scale, even ultragiant scale.
出处
《大地构造与成矿学》
EI
CAS
CSCD
北大核心
2008年第3期338-345,共8页
Geotectonica et Metallogenia
基金
国家科技支撑计划"西部优势矿产资源潜力评价体系及集成示范研究"课题(2003BA612A-01)
中国地质大调查"中国成矿体系综合研究"项目(1212010634002)
"中国成矿体系与区域成矿评价"项目(K1.4)
"我国西部重要成矿区带矿产资源潜力评估"项目(200420190004)
"我国重要矿产和区域成矿规律研究"项目(1212010633903)等的资助
