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对滇东北乐马厂独立银矿床围岩和矿石的Sr同位素地球化学 (Sr 87Sr/ 86Sr体系和δ18O 87Sr/ 86Sr体系 )系统研究 ,证实成矿流体在进入矿石沉淀场所之前曾流经富放射性成因Sr的岩石或地层 ,银矿石沉淀的主要机制为水 岩相互作用 ,而且这个富放射成因锶的源区可能是元古界基底地层 (昆阳群、河口群 ) .其次 ,Sr同位素体系的理论模拟表明 ,成矿流体锶浓度为 3× 1 0 -6,锶同位素组成为 0 .75 0 ,氧同位素组成为7 0‰ ,成矿温度对碳酸岩型矿石为 1 5 0～ 2 5 0℃ ,对碎屑岩型矿石为 2 0 0～ 2 6 0℃ .
The Sr isotope geochemistry (Sr 87Sr / 86Sr system and δ18O 87Sr / 86Sr system) of the surrounding rocks and ores of the Lemachang independent silver deposit in the northeastern Yunnan Province confirmed that the ore-forming fluids flowed through the rich radiogenic genesis Sr rocks or strata, the main mechanism of silver deposit precipitation is water-rock interaction, and the source region of this rich radiogenic strontium may be Proterozoic basement strata (Kunyang Group, estuarine group) .Secondly, the theory of Sr isotope system The simulation shows that the concentration of strontium in the ore-forming fluid is 3 × 10-6, the strontium isotope composition is 0.7575, the oxygen isotope composition is 70%, and the metallogenetic temperature is 150 ~ 250 ℃ for carbonate rocks , For clastic rock type ore is 200 ~ 2600C.