Transport, Concentration, and Deposition of Precious Metals in Layered Gabbros During Continental Rifting

大陆裂谷期间层状辉长岩中贵金属的传输、富集和沉积

• 批准号: 9206962
• 负责人: Dennis Bird
• 金额: $ 4.81万
• 依托单位: Stanford University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-07-01 至 1993-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9206962&HistoricalAwards=false
• 关键词: Transport; Concentration; Deposition; Precious; Metals

Recent discoveries of gold and platinum group (PGE) mineralization in Eocene layered gabbros of East Greenland demonstrate that physical and chemical processes associated with the transition from continental to oceanic rifting can concentrate precious metals in the Earth's crust. One of these gabbros, the Kap Edvard Holm Complex, exhibits an unusual combination of features related to stratiform precious metal mineralization. An understanding of these processes requires detailed field, petrologic, isotopic, and chemical analyses, combined with theoretical analysis of the thermodynamic and transport characteristics of magma-hydrothermal systems. The long-term plans for this research program inviove using these techniques to provide new insights into the nature of processes controlling: 1) precious metal concentration during gabbro crystallization; and 2) precious metal transport and deposition in gabbro-hosted hydrothermal systems. A specific objective of the research will be evaluation of various hypotheses that may explain the unusually high ratio of precious metal to sulfide that is characteristic of this deposit. Investigation of the processes responsible for mineralization in the East Greenland gabbros is potentially of great importance to understanding the global distribution of precious metals and to formulating future mineral exploration strategies. The present award will enable him to get started while he is formulating a plan to achieve the long-term goals.

金铂族（PGE）矿化的新发现 东格陵兰始新世层状辉长岩表明， 物理和化学过程与过渡从 大陆到海洋的裂谷作用可以使贵金属集中在 地壳 卡普爱德华霍尔姆辉长岩 复杂，表现出与以下相关的特征的不寻常组合： 层状贵金属矿化 了解 这些过程需要详细的现场，岩石学，同位素， 化学分析，结合理论分析， 岩浆热液热力学和输运特征 系统. 这项研究计划的长期计划在inviove 利用这些技术， 工艺控制：1）在生产过程中的贵金属浓度 辉长岩结晶; 2）贵金属迁移和 辉长岩热液系统中的沉积。 特定 研究的目的是对各种假设进行评估 这也许可以解释贵金属与 这种存款特有硫化物。 调查 东格陵兰岛的矿化过程 辉长岩对于理解 贵金属的全球分销和制定未来 矿产勘探战略。 本奖项将使他 在他制定计划以实现 长期目标。