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云南镇康芦子园铅-锌矿的成矿年龄
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摘要
芦子园铅锌矿为保山-镇康地块中一个重要的热液矿床。矿床赋存于早古生代碳酸盐岩中,经人工分选出矿石中的闪锌矿、黄铜矿、与矿石硫化物密切共生的热液石英及石英钾长石脉中的钾长石等共10件单矿物样品,采用Rb-Sr同位素定年分析,获得等时线年龄141.9±2.6 Ma,初始锶同位素组成为87Sr/86Sr(t=141.9 Ma)=0.714 497。揭示成矿作用时代与中特提斯怒江洋闭合时期大致相当,矿石初始锶同位素组成也与保山-镇康地块中燕山期花岗岩初始Sr同位素组成基本一致,指示矿床的成因可能与燕山期岩浆活动有关,是中特提斯怒江洋闭合过程中碰撞造山作用的响应。
        The Luziyuan lead-zinc deposit hosted in the early paleozoic carbonate rocks is an important ore deposit in the Baoshan-Zhenkang block.10 sulfide mineral separates including sphalerites,chalcopyrites,paragenous related quartz and feldspar were separated by hand picking.Rb-Sr analyses yield an isochron age of 141.9±2.6 Ma and an initial 87Sr/86Sr of 0.711 85.It reveals that the mineralization is contemporaneous with the closure of the meso-Tethys "Lujiang" ocean and the initial Sr isotopic composition of the deposit ore is analogues to that of the Yanshanian granitoid in the Baoshan-Zhenkang block.It can be concluded that the mineralization is genetically related with the granitic magmatism of orogeny which is responsible to the closure of the Meso-Tethys "Lujiang" ocean.
引文
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