金同铅锌矿化的分离及共生

THE SEPARATION OF GOLD FROM LEAD ZINC MINERALIZATION AND THEIR PARAGENESIS

金矿化同铅锌矿化存在独特的关系。在块状硫化物矿床和现代洋底硫化物堆积物中金和贱金属的富集程度基本上是相同的，而脉状金矿床中，在富集了大约１０３～１０４的金的同时仅轻度富集或实际上贫化（１０１～１０－１）贱金属铅锌；此外，人们还发现在特定的地质构造背景中，金矿床和铅锌矿床相伴产出，在勘查过程中两类矿床可以互为标志。造成金同铅锌共生和分离的原因是成矿流体的化学成分和流体流动循环方式，在较低温度、高水岩比、Ｃｌ络合物为主的体系中金与铅锌相伴富集，高温、高热梯度、低水岩比。

There is a special relationship of gold mineralization to lead zinc mineralization.Archaean lode gold deposits of both vein and sedimentary types are typically riched in Au,As,Sb,B,W,Se,Te and Bi in the 10 3 10 4 range,with low abandance of base metals Cu,Pb and Zn(10 -1 10 1),and a dramatic separation of the rare versus abundant elements relative to background levels.However,polymetallic massive sulfide deposits both on the modern seafloor and land have remarkably uniform enrichment of Au and Cu,Pb and Zn.the paragenous occurrence of Au and Pb,Zn deposits has been discovered in the special geological and structural environment.This paragenous relation can be used as prospecting criteria.Chemical composition and circulation ways of ore fluid resulted in the paragenesis and seperation of gold and base metals.Gold may be somewhat enriched along with Cu,Zn,Pb at lower temperature,high water/rock,Cl complex dominated systems,but the high temperature,high thermal gradient,low water/rock and low chloride ore forming fluid is likely leading to gold deposits.