青海胜利沟地区滩间山群变质火山岩地球化学特征及其与成矿关系研究

胜利沟地区位于赛什腾山构造-岩浆岩带南西侧，区内主要出露有上奥陶统滩间山群变质火山岩。地球化学研究表明，火山岩为超基性-基性-中性系列，主要为准铝-低铝质岩类。碱度指数ALK（Na₂O+K₂O）为2.70%~10.73%。岩石分异指数（DI）普遍较低，稀土总量变化大，ΣREE为25.35×10^-6～446.11×10^-6，δEu为0.72~1.08，呈弱负铕异常至正异常，显示出火山弧玄武岩或过渡型洋脊玄武岩的特点。火山岩总体上显示偏钠质特点。在区域上偏钠质火山熔岩及其对应的火山碎屑岩为金矿最好的赋矿层位，显示了本区火山岩地层巨大的成矿潜力。

Geochemical Study of Tanjianshan Group Metavolcanic Rocks in Shengligou Area and its Relationship with Gold Mineralization

Shengligou area in Qinghai Province is located in the southwest side of the tectonics and magmatic rocks belt of Saishiteng Mountain region.Moreover,it is found that the ordovician beach on the mountains metamorphic volcanic rocks appear in the region.Overall,the geochemical features show that volcanic rocks belong to the type of ultrabasic-basic-neutral series,and mainly with quasi aluminum-low aluminum rock. Alkalinity index ALK（Na2O＋K2O） is approximately 2.70%-10.73%.Rock differentiation index（DI）displays low value on the whole,but total rare earth change with the SREE 25.35×10^-6-446.11×10^-6,which presents the characteristics of volcanic arc basalt or transitional ridge basalt.Additionally,the volcanic rocks in the study area overall displays partial sodium qualitative characteristics.Partial sodic volcanic lava in the area and its corresponding volcanic clastic rock are best gold ore bearing strata,which indicates that the huge mineralization potential of volcano rock strata in the region.