CAREER: Did Carlin-type Gold Come From Magmas?

职业：卡林型黄金来自岩浆吗？

• 批准号: 1752756
• 负责人: Elizabeth Holley
• 金额: $ 53.45万
• 依托单位: Colorado School of Mines
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-02-01 至 2025-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1752756&HistoricalAwards=false
• 关键词: CAREER; Did; Carlin; type; Gold

Nearly 80% of the gold produced in the United States comes from northern Nevada's Carlin-type gold deposits. Despite more than 50 years of production and the great economic importance of these deposits, their genesis is debated. Some researchers argue that the gold must have come from magmas emplaced in the shallow crust, while others propose that the gold was already present in the sedimentary host rocks and magmatism was not necessary to create economic concentrations of gold. This project addresses the scientific controversy and aims to facilitate exploration efforts through improved understanding of how Carlin-type gold deposits formed. Particularly in Nevada's prolific Carlin trend, many studies have attempted to link the gold to Eocene magmas; although the data are permissive, unequivocal evidence remains elusive. This project takes a new approach by focusing on the northern Battle Mountain district, where there is Carlin-type gold, porphyry and skarn deposits that are known to have a magmatic origin, and distal disseminated deposits bearing hybrid characteristics of all of those deposit styles. In order to determine whether the distal disseminated deposits link the Carlin-type gold to causative magmatic intrusions, this project will characterize the nature of the ore fluids and the timing of mineralization at adjacent gold deposits. In addition to addressing a long-standing knowledge gap in economic geology, this work contributes towards advancing broader geoscience initiatives to characterize magmatism and metal flux in the crust. Despite the critical importance of mining to national security and the increasingly complex environmental and social framework in which mining occurs, the United States has a shortage of skilled labor in this sector. This project integrates teaching and research on ore deposits to develop innovative curricula that will recruit and retain students in educational pathways leading to careers in mining. The project science will be incorporated into a graduate field course and undergraduate case study modules at Colorado School of Mines, and a K-12 teacher training workshop conducted in collaboration with Relay Graduate School of Education and the Colorado Mining Association. In addition to serving as the basis for two PhD dissertations, the 5-year project will reach 50 graduate students, 150 undergraduate students, 25+ science teachers, and 600+ K-12 students.

美国生产的黄金近80%来自内华达州北部的卡林型金矿床。尽管这些矿床已有 50 多年的生产历史并且具有巨大的经济重要性，但其成因仍存在争议。一些研究人员认为，黄金一定来自浅层地壳中的岩浆，而另一些研究人员则提出，黄金已经存在于沉积母岩中，岩浆作用对于创造黄金的经济集中度来说并不是必要的。该项目解决了科学争议，旨在通过加深对卡林型金矿床形成方式的了解来促进勘探工作。特别是在内华达州多产的卡林趋势中，许多研究都试图将黄金与始新世岩浆联系起来。尽管数据是允许的，但明确的证据仍然难以捉摸。该项目采取了一种新方法，重点关注Battle Mountain地区北部，那里有已知具有岩浆成因的卡林型金矿、斑岩矿和夕卡岩矿床，以及具有所有这些矿床类型混合特征的远端浸染状矿床。为了确定远端浸染状矿床是否将卡林型金矿与成因岩浆侵入联系起来，该项目将表征矿石流体的性质以及邻近金矿床的矿化时间。除了解决经济地质学方面长期存在的知识差距之外，这项工作还有助于推进更广泛的地球科学举措，以表征地壳中的岩浆作用和金属通量。尽管采矿业对国家安全至关重要，而且采矿业所处的环境和社会框架日益复杂，但美国在该领域仍缺乏熟练劳动力。该项目将矿床教学和研究结合起来，开发创新课程，以招募和留住学生，让他们走上通往采矿业的教育道路。该项目科学将纳入科罗拉多矿业学院的研究生实地课程和本科生案例研究模块，以及与 Relay 教育研究生院和科罗拉多矿业协会合作举办的 K-12 教师培训研讨会。除了作为两篇博士论文的基础外，这个为期 5 年的项目还将覆盖 50 名研究生、150 名本科生、25 名以上科学教师和 600 多名 K-12 学生。

项目成果

Solving geological mixing problems with Bayesian tracer models: A demonstration of the method applied to Carlin-type pyrite

用贝叶斯示踪剂模型解决地质混合问题：该方法应用于卡林型黄铁矿的演示

• DOI: 10.1016/j.gexplo.2022.107091
• 发表时间: 2022
• 期刊: Journal of Geochemical Exploration
• 影响因子: 3.9
• 作者: Holley, E.A.;Phillips, D.L.
• 通讯作者: Phillips, D.L.

Hyperspectral remote sensing of white mica: A review of imaging and point-based spectrometer studies for mineral resources, with spectrometer design considerations

• DOI: 10.1016/j.rse.2022.113000
• 发表时间: 2022-06
• 期刊: Remote Sensing of Environment
• 影响因子: 13.5
• 作者: John M. Meyer;R. Kokaly;E. Holley

Nanoscale isotopic evidence resolves origins of giant Carlin-type ore deposits

纳米级同位素证据解决了巨型卡林型矿床的起源

• DOI: 10.1130/g49888.1
• 发表时间: 2022
• 期刊: Geology
• 影响因子: 5.8
• 作者: Holley, E.A.;Fulton, A.;Jilly-Rehak, C.;Johnson, C.;Pribil, M.
• 通讯作者: Pribil, M.

Fe-oxides in jasperoids from two gold districts in Nevada: Characterization, geochemistry, and (U-Th)/He dating

• DOI: 10.1016/j.gca.2020.07.014
• 发表时间: 2020-10
• 期刊: Geochimica et Cosmochimica Acta
• 影响因子: 5
• 作者: Dante E. Huff;E. Holley;W. Guenthner;J. Kaempfer