Stable Isotope Constraints on Source, Contamination, and Alteration of Great Basin Igneous Rocks, and Implications for Metallogeny

稳定同位素对大盆地火成岩来源、污染和蚀变的制约及其对成矿的启示

• 批准号: 0309935
• 负责人: Greg Arehart
• 金额: $ 26.79万
• 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: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-07-01 至 2007-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0309935&HistoricalAwards=false
• 关键词: Stable; Isotope; Constraints; Source; Contamination

EAR-0309935ArehartCarlin-type deposits are amongst the richest and most important hydrothermal gold deposits in North America and appear to be associated in time and space with Eocene magmatism. In contrast, older magmatic episodes do not appear to have generated similar deposits. To better understand the interaction of ascending magmas, which were the driving force for these hydrothermal systems, with crustal rocks through which the magmas passed, measurements of stable isotopes of sulfur and oxygen will be made of unaltered plutonic rocks in the Great Basin. These measurements will be compared to similar isotopic measurements of crustal (cratonic basement, late Proterozoic rift-filling sedimentary rocks, Phanerozoic sedimentary rocks) and mantle materials that could have provided components to these igneous rocks. These data, when combined with extant geological, geochemical and geophysical data, will then be used to elucidate the crustal architecture of the region, to understand its control on the development of giant hydrothermal systems. These data will also address the question of why magmatism of different ages but in the same region, apparently did not generate the same large-scale metal redistribution in the crust that occurred in the Eocene.The proposed research will provide opportunities to students focused on developing careers in mineral deposits research . The combination of applied science supported by both industry and government will provide students exposure to multiple aspects of mineral deposit research, and is critical in training the upcoming generation of mineral geoscientists for positions in industry, academia, or government. Support for this research will help to maintain and enhance the infrastructure for research and education, including the Nevada Stable Isotope Laboratory

EAR-0309935关怀式型沉积物是北美最富有，最重要的水热沉积物之一，似乎与始新世的岩浆作用相关联。 相反，较旧的岩浆发作似乎没有产生类似的沉积物。 为了更好地理解上升岩浆的相互作用，这是这些水热系统的驱动力，与岩浆通过的地壳岩石通过，硫和氧气的稳定同位素的测量将由大盆地的未改变的丘脑岩制成。 这些测量值将与类似的同位素测量值（cratonic地下室，晚期植物裂填充沉积岩石，phanerokoic沉积岩石）和地幔材料进行比较，这些岩石材料本可以为这些火成岩提供的组成部分。 这些数据与现有的地质，地球化学和地球物理数据结合使用，将用于阐明该地区的地壳结构，以了解其对巨型热液系统发展的控制。 这些数据还将解决为什么不同年龄的岩浆性的问题，但在同一地区，显然并未在始新世中发生的地壳中产生相同的大规模金属再分配。拟议的研究将为专注于矿物质矿床研究的学生提供机会。 由行业和政府支持的应用科学的结合将为学生提供矿物质存款研究的多个方面的接触，对于培训即将到来的矿产地球科学家培训工业，学术界或政府职位至关重要。 对这项研究的支持将有助于维护和增强研究和教育的基础设施，包括内华达州稳定的同位素实验室