Age of Formation of Carlin-Type Gold Deposits and Relationship to Tectonic Environments

卡林型金矿床形成时代及其与构造环境的关系

• 批准号: 9805384
• 负责人: Greg Arehart
• 金额: $ 11万
• 依托单位: Board of Regents, NSHE, obo University of Nevada, Reno
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-07-01 至 2000-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9805384&HistoricalAwards=false
• 关键词: Age; Formation; Carlin; Type; Gold

9805384ArehartCarlin-type gold deposits (CTDs) are a major focus of mining and exploration activity in the US today, yet processes leading to their genesis are poorly understood. The goal of this research is to investigate the causes and conditions of Carlin-type gold deposit formation by addressing questions regarding the timing of deposition and the relationship between hydrothermal circulation, ore deposition, and magmatic and tectonic events. Of particular importance is resolution of the question of whether there is a common theme responsible for CTD formation either through magmatic association or unique tectonic environment. In order to address the fundamental issue of CTD formation age several avenues will be followed at individual deposits in the Carlin Trend: acquisition and synthesis of geological, petrological and structural data; stable isotope comparison of mineralizing fluids with secular curves for meteoric waters; conventional and laser-assisted argon geochronology on igneous rocks and alteration minerals; fission-track dating of apatite and zircon; and U-Pb dating of hydrothermal apatite. In addition, the applicability of the rhenium-osmium system for direct dating of gold-bearing sulfides will be explored. By understanding the timing of ore deposition additional constraints will be placed on the potential sources of fluids and heat to drive hydrothermal circulation in Carlin-type gold deposits.

9805384关怀卡林 - 型黄金沉积物（CTD）是当今美国采矿和勘探活动的主要重点，但是导致其起源的过程知之甚少。这项研究的目的是通过解决有关沉积时间以及水热循环，矿石沉积以及岩浆和构造事件之间关系的问题来研究Carlin型金矿形成的原因和条件。特别重要的是解决问题的问题是，是否有一个共同的主题来负责通过岩浆协会或独特的构造环境来造成CTD形成。为了解决CTD形成年龄的基本问题，Carlin趋势中的个别沉积物将遵循几种途径：地质，岩石学和结构数据的获取和综合；稳定的同位素比较矿化流体与陨石水的世俗曲线；传统和激光辅助氩气对火成岩和变化矿物的地质学；磷灰石和锆石的裂变轨道约会；和水热磷灰石的U-PB年代。另外，将探索rhenium osmium系统在直接定年的含金硫化物的直接约会中的适用性。通过理解矿石沉积的时间，将在流体和热量的潜在来源上放置其他约束，以驱动Carlin型黄金沉积物中的热液循环。