贵州水银洞含金黄铁矿中金的赋存形式探讨

采用扫描电子显微镜和电子探针等手段，对贵州水银洞金矿中黄铁矿进行形貌观察和成分测定，结果表明，黄铁矿具有草莓状、立方体、五角十二面体及胶状等多种形态，其中，五角十二面体和胶状黄铁矿含金，且金与砷含量存在一定的关系。从量子化学计算和最紧密堆积原理探讨金进入黄铁矿晶格中的情况：金以Au+进入晶格中，替代S位比替代Fe位更容易，而且当黄铁矿中含砷时，有利于金进入晶格，但并非含砷越高，含金就越高。当含砷量在一定范围内，含砷高，含金也高；当含砷量超过某一值，反而不利于金进入晶格。

Study on Modes of Occurrence of Gold for Shuiyindong Gold Bearing Pyrite in Guizhou Province

Topographic observation and composition determination for Shuiyindong pyrite in Guizhou Province were conducted by making use of scanning electron microscope and electron probe.The results show pyrite have multifarious morphology such as strawberry hemangioma,cube,pentagonal dodecahedron and colloidal,etc,which pyrite of pentagonal dodecahedron and colloidal contain gold and indicate some relationship with the content of arsenic.Discussing the situation of gold coming into pyrite lattice with the using of quantum chemistry calculation and the dense packing powder theory,the phenomenon of gold coming into lattice in the form of Au^＋and replacing S position more easily than Fe position was discovered.It is effortless for Au^＋entering lattice,when pyrite contain arsenic,but it doesn＇t mean gold content is directly proportional to arsenic content.With a deteclion limit,while there is more arsenic,there is more arsenic,but without the arsenic limit,gold is not so easily to enter into the lattice as the former case.