A Comparative Study of Fe-P Mineralization

铁磷矿化对比研究

• 批准号: 9117372
• 负责人: Mark Barton
• 金额: $ 15万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-04-15 至 1995-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9117372&HistoricalAwards=false
• 关键词: Comparative; Study; Fe; Mineralization

This project proposes to examine two areas of contrasting Fe-P mineralization in the mid-Mesozoic of the northern Great Basin and compare them with results from ongoing cooperative studies of the Proterozoic Fe-P deposits in southeastern Missouri. Areas for selected study are: (1) the Humboldt Lopolith (western Nevada); (2) the Cortez Mountains (central Nevada); and (3) the granite- rhyolite terrane of the St. Francois Mountains. It is planned to: (1) characterize selected deposits, associated alteration, and related magmatism, (2) evaluate the conditions of formation and the sources of components, and (3) investigate reasons for similarities and differences. Selective mapping and sample collection will be followed by petrographic and geochemical work. The Missouri portion of this project extends a joint effort with the Missouri DLGS and USGS to understand mid-continent "Olympic Dam" systems. Radiogenic isotopic analyses (Sr, Nd, Pb) from well- characterized samples will be used to: (1) improve geochronometry of mineralization, and (2) help resolve sources of components and mechanisms of ore formation. Regional stable-isotope studies (O, H, S) and selected radiogenic isotopic analyses will investigate the timing, distribution, and intensity of hydrothermal systems and their relationship to mineralization. The Missouri and Nevada investigations combine two complementary ongoing efforts with the long-term aim of quantitatively interpreting the genesis of Fe-P deposits.

本项目拟考察大盆地北部中中生代两个不同的铁磷矿化区，并将其与密苏里州东南部元古代铁磷矿床的合作研究结果进行比较。选定的研究区域有：(1)洪堡Lopolith（内华达州西部）；(2)科尔特斯山脉（内华达州中部）；(3)圣弗朗索瓦山脉的花岗岩流纹岩地体。计划：(1)对选定的矿床、相关蚀变和相关岩浆活动进行表征；(2)评价形成条件和成分来源；(3)调查相似和不同的原因。选择性制图和样品采集将在岩石学和地球化学工作之后进行。该项目的密苏里部分扩展了密苏里州DLGS和USGS的共同努力，以了解中部大陆的“奥林匹克大坝”系统。从特征良好的样品中进行放射性成因同位素分析（Sr, Nd, Pb）将用于：(1)改善矿化的地质年代学，(2)帮助确定成矿成分的来源和形成机制。区域稳定同位素研究（O， H， S）和选定的放射性成因同位素分析将研究热液系统的时间、分布和强度及其与矿化的关系。密苏里州和内华达州的调查结合了两个互补的正在进行的努力，其长期目标是定量解释铁磷矿床的成因。