Multi-stage enrichment processes for large gold-bearing ore deposits
Multi-stage enrichment processes for large gold-bearing ore deposits
复制标题
DOI：
10.1016/j.oregeorev.2015.09.002
复制
发表时间：
2016-07
期刊：
影响因子：
--
通讯作者：
S. Meffre;R. Large;J. Steadman;D. Gregory;A. Stepanov;Kamenetsky;K. Ehrig;R. Scott
中科院分区：
文献类型：
--
作者：
S. Meffre;R. Large;J. Steadman;D. Gregory;A. Stepanov;Kamenetsky;K. Ehrig;R. Scott
回顾以往对世界大型热液金矿床的研究表明，大型矿床往往表现出复杂的共生关系，在存款生成过程中涉及多个金富集事件和过程。这些观察结果表明，多阶段过程甚至可能是形成大型矿床的必要条件。在某些矿床（如威特沃特斯兰德、Boddington Cadia、苏霍伊日志或卡林），不同的富集过程相隔数百万年。在其他地方，如许多大型斑岩矿床，不同阶段的时间要近得多。在许多矿床，特别是沉积物矿床中，早期的扩散富集发生在特定的区域内，然后通过更集中的过程（例如，Sukhoi Log; Kalgoorlie）。这种早期扩散富集的存在可以解释金矿床聚集成营地的趋势。该模型具有重要意义，因为多个金事件的存在或不存在可以用于在勘探和可行性阶段区分具有单阶段矿石成因的小型矿床和具有多阶段富集和更大黄金储量潜力的更复杂矿床。
A review of previous studies of the world's large hydrothermal gold deposits indicates that the largest deposits tend to show complicated parageneses where multiple gold enrichment events and processes have been involved in the deposit generation. These observations suggest that multistage processes may even be a requirement for the formation of large deposits. In some deposits (e.g. Witwatersrand, Boddington Cadia, Sukhoi Log or Carlin) the different enrichment processes occur millions of years apart. In others, such as many large porphyry deposits, the different stages are much closer in time. In many deposits, particularly sedimentary-hosted deposits, early diffuse enrichment occurs within a particular province that is then upgraded by more focused processes (e.g., Sukhoi Log; Kalgoorlie). The presence of this early diffuse enrichment could explain the tendency for gold deposits to cluster into camps.This model has important implications, as the presence or absence of multiple gold events could be used to discriminate, at the exploration and feasibility stages, between small deposits with single stage ore genesis and more complicated deposits with multistage enrichment and the potential for larger gold endowment.