关键词: 准铝—低铝质岩, 火山弧玄武岩, 洋脊玄武岩, 成矿潜力, 赛什腾山, 青海省

Abstract:

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 ΣREE 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.

Key words: quasi aluminum-low aluminum rock, volcanic arc basalt, oceanic ridge basalt, metallogenetic potentiality, Saishiteng Mountain, Qinghai Province