内蒙古额仁陶勒盖银矿床稳定同位素研究

Study on Stable Isotope in Inner MongoliaErentaolegai Silver Deposit

额仁陶勒盖银矿床是次火山热液作用产物。燕山晚期本区受太平洋板块的影响 ,额尔古纳断裂带复活 ,产生壳幔混合作用形成花岗质岩浆 ,该岩浆在地下浅处发生强烈的结晶分异作用 ,形成花岗岩和石英斑岩 ,两者是同一岩浆结晶演化不同阶段的产物。石英斑岩是花岗质岩浆成岩期的最后产物 ,分异作用导致银在成岩后期及期后成矿热液中富集。因此 ,石英斑岩是矿床的直接母岩。

Erentaolegai Silver deposit is a product of subvolcanic hydrothermal activity The local area was edge-subjected to the movement in late Yanshan The faults which had been exited were revived, bringing about intense activity of granite magma Eerguna fault belt rejuvenated and produced the crust-mantle mixture to form the granite magma which have taken place a strong crystal fractionation in shallow surface and formed the granite and quartz-porphyry They are products of different stage at same magma crystal evolution The quartz -porphyry is the lastest stage of magma, silver was enriched in the later diagenectic and post-diagenectic ore solution Therefore, the quartz-porphyry is the parent rock of the deposit Meteorological water on earth’s surface played an important role in forming the magma and deposit