摘要
小宛南山金矿是产于太古宙花岗岩-绿岩地体,受敦煌群D岩组上部层位和韧性剪切带控制的变质热液型金矿床。矿源岩为绿岩带的镁铁质火山岩,成矿流体主要为变质热液,主成矿期属中元古宙。基于金矿床区域地质背景、矿床地质特征、微量元素特征、硫铅同位素组成和包裹体特征,以金赋存层位、容矿岩石、韧性剪切构造、蚀变作用为基础,通过分析成矿地质条件,证明金矿床应属变质热液成因。
Xiaowannanshan gold deposit, controlled by ductile shear zones and higher horizon of D Rock-Formation of Donghuang Group, is a metamorphic-hydrothermal type, occurring in Achaean granitoid-greenstone terrain. The source rocks are mafic volcanic rocks in the greenstone belt. The mineralization fluids are mainly metamorphic hydrothermal fluids. Middle Proterozoic is the main mineralization period. Regional geological background, local geological features, rare element characteristics, S- and Pb-isotopic composition, and fluid inclusions in quartz have been discussed. Based on host strata and rocks, ductile shear structures, wallrock alteration, it is demonstrated that Xiaowannanshan gold deposit should be of metamorphic hydrothermal genesis.
出处
《地质与勘探》
CAS
CSCD
北大核心
2005年第3期27-32,共6页
Geology and Exploration
关键词
金矿
矿床特征
地球化学特征
矿床成因
gold deposit, ore deposit characteristics, geochemical characteristics, genesis
