摘要
库布苏金矿床的三个金矿带均产于闪长玢岩和花岗闪长斑岩内。为了研究这些岩脉与金矿的成因关系 ,测定了含金石英脉中石英流体包裹体均一温度、成分、盐度和 H2 O的氢氧同位素 ,分析了含金石英脉和相关脉岩及围岩的稀土元素及微量元素。发现石英流体包裹体属有较高的均一温度、低盐度、富 CO2 的还原性流体 ,其阳离子组合为 Ca2 + >Na+ >K+或Na+ >K+ >Mg2 + 型 ,阴离子组合属 Cl- >SO42 - >F- 型 ,具变质流体特征 ;岩脉和含金石英脉的稀土元素及微量元素配分模式及组合特征差别显著 ,表明二者间不具物质成分的联系。依据上述结果和矿床地质特征推测 :该区成脉岩浆与变质成矿流体的上升受同一构造控制 。
The three ore belts of Kubusu gold deposit all were preduced in dikes of diorite porphyrite and granodiorite porphyry. To study genetic relationship between these dikes and gold orebodies, we determined the homogenization temperature, composition, salinity and hydrogen oxygen isotope of H 2O of fluid inclusions in quartz of gold bearing quartz vein, REE and trace elements of gold bearing quartz vein and rock of correlative dikes and country rock are detemined. It is found that, the fluid inclusions in quartz is reductive fluid with higher homogenization temperature, lower salinity and CO 2 rich and its cationic assemblage type is Ca 2+ >Na +>K + or Na +>K +>Mg 2+ , anionic assemblage type is Cl ->SO 4 2- >F -, having features of metamorphic fluid. The REE patterns and assemblage signature of trace elements of gold bearing quartz vein and dike rock are prominetly different, indicating that the gold bearting quartz veins have no relation to these dikes in composition. Therefore, we inferred from these analytical results and geologic characteristics of deposit: the rise of magma formed these dikes and ore forming fluid are controlled by same structure and dike rock is brittler relative to their wall rocks, that are essential cause of close space relationship between dikes and gold orebodies.
出处
《岩石学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第4期595-601,共7页
Acta Petrologica Sinica
基金
国家"九五"科技攻关项目 (96-915 -0 2 -0 6-0 1)
关键词
金矿床
岩脉
成矿流体
微量元素
成因
矿床地质
Gold ore deposit, Dike, Ore forming fluid, Trace elements, Genetic relationship, Kubusu
