摘要
东川拖布卡金矿是滇中昆阳群地层找矿的重大突破 ,金资源量达大型矿床规模。分褐铁矿型和石英脉型金矿石两类 ,以石英脉型金矿石为主 ,地表为氧化矿石。金矿成矿受中元古界昆阳群美党组及其近NS向脆 韧性剪切带的双重影响和控制。含金石英脉中石英的 4 0 Ar 39Ar法测年结果 :视年龄值在 4 2 38× 10 6 a～ 5 9 93× 10 6 a之间 ;等时年龄为 4 1 2 5× 10 6 a～5 9 34× 10 6 a ;反等时年龄为 4 0 2 4× 10 6 a～ 5 6 2 5× 10 6 a ;反映金的富集主要形成于喜马拉雅期 ,新生古储的特点十分明显。
The discovery of Au deposit in Tuobuka of Dongchuan is one of the very important advances of ore-prospecting works in Kunyang Group. The ore-bearing Meidang Formation was formed in (the late) stage of the evolution of Kunyang taphrogeosyneline. There are two types of ores. And the main one is the Au-bearing quartz vein. According to the^(40)Ar-^(39)Ar dating of quartz mineral, the age values are 42.38 MaBP～59.93 MaBP. This indicates that the Tuobuka Au deposit was formed mainly in Himalayan period.
出处
《云南地质》
2003年第4期371-381,共11页
Yunnan Geology
基金
国家 973项目下属"中国西南部新生代碰撞
伸展和走滑过程与大规模成矿研究"课题资助
关键词
金矿床
成矿地质
年代学
褐铁矿
地层
构造控矿
Au Deposit in Kunyang Group
Limonite-Quartz Vein Type
Strata-Structure Ore-controlling
Metallogenetic Age
TuobukaDongchuan
