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

基本信息

项目摘要

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
arehartcarlin型金矿床是北美最丰富、最重要的热液金矿床之一,在时间和空间上与始新世岩浆活动有关。相比之下,较老的岩浆期似乎没有产生类似的矿床。为了更好地理解上升岩浆与岩浆穿过的地壳岩石之间的相互作用(岩浆是这些热液系统的驱动力),将对大盆地中未改变的深成岩进行硫和氧的稳定同位素测量。这些测量结果将与类似的地壳(克拉通基底,晚元古代裂谷填充沉积岩,显生宙沉积岩)和地幔物质的同位素测量结果进行比较,这些物质可能为这些火成岩提供成分。这些数据与现有的地质、地球化学和地球物理数据相结合,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。这些数据还将解释为什么不同时代但在同一地区的岩浆活动,显然没有在始新世发生的地壳中产生同样大规模的金属再分配。拟议的研究将为专注于发展矿藏研究事业的学生提供机会。由行业和政府支持的应用科学的结合将使学生接触到矿床研究的多个方面,并且对于培养下一代在行业,学术界或政府职位的矿物地球科学家至关重要。对这项研究的支持将有助于维护和加强包括内华达稳定同位素实验室在内的研究和教育基础设施

项目成果

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Greg Arehart其他文献

Greg Arehart的其他文献

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{{ truncateString('Greg Arehart', 18)}}的其他基金

Mass Redistribution in Continental Magmatic-Hydrothermal Systems
大陆岩浆-热液系统中的质量再分布
  • 批准号:
    0412883
  • 财政年份:
    2004
  • 资助金额:
    $ 26.79万
  • 项目类别:
    Standard Grant
Acquisition of a Stable Isotope Facility to Study Earth and Environmental Systems and Processes
购买稳定同位素设施来研究地球和环境系统及过程
  • 批准号:
    9977209
  • 财政年份:
    1999
  • 资助金额:
    $ 26.79万
  • 项目类别:
    Standard Grant
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
  • 财政年份:
    1998
  • 资助金额:
    $ 26.79万
  • 项目类别:
    Standard Grant

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  • 批准号:
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  • 批准年份:
    2010
  • 资助金额:
    52.0 万元
  • 项目类别:
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