贵州灰家堡金矿田成矿与蚀变元素迁移

选择贵州省灰家堡金矿田内最为典型的水银洞矿床和太平洞矿床,研究卡林型金矿床围岩蚀变过程中元素迁移规律与方式,探讨围岩蚀变与金矿化的内在联系。典型矿床围岩→矿化围岩→矿石的岩相学特征及与其对应的Grant质量平衡方程计算结果表明,卡林型金矿各成矿阶段所对应的围岩蚀变类型与通过计算所反映的元素迁移规律相一致;地球化学热力学计算结果显示,Au主要以AuHS0络合物的形式在成矿溶液中迁移。元素迁移研究的结果证明不同成矿阶段发生的围岩蚀变促进卡林型金矿主要成矿物质发生迁移,进而沉淀富集成矿。

Study on mineralization and migration of alteration elements in Huijiabao gold field,southwestern Guizhou,China

The Shuiyindong deposit and Taipingdong deposit in the Huijiabao ore field are selected to study the migration regularity and mode of elements in the process of wallrock alteration of the Carlin-type gold deposit and to explore the internal relationship between the alteration and gold mineralization.Study of typical surrounding rocks,mineralization rocks,ore petrographic characteristics and corresponding grant mass balance equation shows that the type of wallrock alteration corresponding to the metallogenic stage of the Carlin-type gold deposit is consistent with the element migration law revealed by calculation.Geochemical thermodynamics calculation suggests that gold mainly migrates in the form of AuHS0 complex in the ore-forming solution.It shows that the wallrock alteration in different metallogenic stages promotes the migration of major ore-forming materials in the Carlin-type gold deposits,and then precipitates and enriches the gold ore formation.