Mineralogical and Isotopic Properties of Hydrothermal Pyrite in Relation to Their Formational Mechanisms

热液黄铁矿的矿物学和同位素性质与其形成机制的关系

• 批准号: 9004813
• 负责人: Hiroshi Ohmoto
• 金额: $ 13.47万
• 依托单位: Pennsylvania State Univ University Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-06-15 至 1993-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9004813&HistoricalAwards=false
• 关键词: Mineralogical; Isotopic; Properties; Hydrothermal; Pyrite

The main objectives of this project are: (1) to understand the relationship among various properties of pyrite (e.g. reflectivity, hardness, anisotropy, lattice cells, sulfur deficiency, conductivity, surface reactivity, 34S), the specific pathways of pyrite formation (e.g. replacement of stable or metastable iron monosulfide, direct precipitation from hydrothermal fluids), and the mechanisms of polysulfide generation (e.g. H2 diffusion, H2S - SO42-reaction) that are involved in the formation of hydrothermal pyrites, and (2) to determine the kinetic and the equilibrium sulfur isotopic fractionation factors between pyrite and various aqueous sulfur species. These objectives will be pursued by a variety of hydrothermal experiments to synthesize iron disulfide minerals at 200oC - 350oC, by mineralogical, chemical, electrochemical and sulfur isotopic investigations of the experimental run products. The results from this project may provide a set of mineralogical and isotopic indicators of geochemical processes and environments of ore formation, and of chemical and isotopic compositions of hydrothermal fluids as well as information useful for the development of pyrite as a semiconductor.

本项目的主要目标是：（1）了解 黄铁矿的各种性质之间的关系（例如， 反射率，硬度，各向异性，晶格，硫 缺陷，电导率，表面反应性，34S），特定的 黄铁矿形成的途径（如稳定或 亚稳硫化铁，直接沉淀， 热液流体），以及多硫化物的机制 生成（例如H2扩散，H2S-SO42-反应）， 参与热液黄铁矿的形成，以及（2） 测定动力学和平衡硫同位素 黄铁矿与各种水硫的分馏因子 物种 这些目标将由各种不同的 水热实验合成二硫化铁矿物. 200oC-350oC，通过矿物学、化学、电化学和 硫同位素研究的实验运行产品。 该项目的结果可能会提供一套矿物学 和地球化学过程的同位素指标， 成矿环境、化学环境和同位素环境 热液流体的组成以及有用的信息 用于发展黄铁矿作为半导体。