Kinetics of the Formation and Transformation of Iron Oxides in Hydrothermal Systems

水热系统中氧化铁的形成和转化动力学

基本信息

  • 批准号:
    0229556
  • 负责人:
  • 金额:
    $ 30.67万
  • 依托单位:
  • 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

项目摘要

Most of the world's Fe supply comes from: (a) Precambrian banded iron formations (BIFs), which were composed of a variety of iron-bearing minerals (hematite, magnetite, siderite, and pyrite) that accumulated in submarine hydrothermal environments; and (b) hematite-rich secondary iron ores that were transformed from the magnetite, hematite, siderite, and pyrite of BIFs. The goals of the proposed research are three-fold: (i) to understand the systematics of the geochemical environments and processes involved in the formation and transformation of iron oxides (and other major Fe-bearing minerals) in submarine hydrothermal systems (e.g., BIFs and VMS -volcanogenic massive sulfide deposits); (ii) to develop mineralogical and geochemical methods to identify the depositional environments of Fe-bearing minerals; and (iii) to develop a new exploration model for iron ore deposits. These goals will be achieved through two series of laboratory investigations, exploring: (I) the kinetics of the formation of iron-bearing minerals and silica during the mixing of Fe2+- and silica-bearing hydrothermal fluids with seawater of various compositions, and (II) the kinetics of the non-redox transformation of hematite magnetite at temperatures below 250 C. Some of the important hypotheses will be tested in this research, including: (1) the concentrations of dissolved O2 and HCO3- in the local seawater played major roles in determining the iron mineralogy of BIFs and other hydrothermal ore deposits formed on the ocean floor; (2) hematite-rich BIFs are good evidence for the oxygenated oceans and atmosphere during the Archean era; (3) siderite-rich BIFs suggest they formed in anoxic basins; (4) the transformation of hematite to magnetite, or magnetite to hematite, which in many types of ore deposits was not caused by redox reactions, but caused by simple additions of Fe2+ to hematite, or leaching of Fe2+ from magnetite: Fe2O3 (hm) + Fe2+ + H2O = Fe3O4 (mt) + 2H+; (4) hematite-rich iron ores formed in deep crust as well as on the land surface.
世界上大部分的铁供应来自:(a)前寒武纪带状铁地层(BIF),由海底热液环境中积累的各种含铁矿物(赤铁矿、磁铁矿、菱铁矿和黄铁矿)组成;(B)富含赤铁矿的次生铁矿石,由BIF中的磁铁矿、赤铁矿、菱铁矿和黄铁矿转化而来。拟议研究的目标有三个方面:(一)了解海底热液系统中氧化铁(和其他主要含铁矿物)的形成和转化所涉及的地球化学环境和过程的系统学(例如,BIFs和VMS -火山成因块状硫化物矿床);(ii)发展矿物学和地球化学方法,以确定含铁矿物的沉积环境;(iii)发展新的铁矿床勘探模式。这些目标将通过两个系列的实验室研究来实现,探索:(I)在含Fe 2+和二氧化硅的热液流体与各种成分的海水混合期间,含铁矿物和二氧化硅的形成动力学,以及(II)赤铁矿的非氧化还原转化动力学 温度低于250 ℃的磁铁矿。 本研究将对一些重要的假设进行检验,包括:(1)当地海水中溶解O2和HCO 3-的浓度对确定BIFs和其他海底热液矿床的铁矿物学起着重要作用;(2)富赤铁矿的BIFs是太古代海洋和大气含氧的良好证据;(3)富含菱铁矿的生物IFs表明它们形成于缺氧盆地;(4)赤铁矿向磁铁矿的转化,或磁铁矿向赤铁矿的转化,在许多类型的矿床中,这不是由氧化还原反应引起的,而是由Fe 2+向赤铁矿的简单添加或Fe 2+从磁铁矿中的浸出引起的:Fe_2O_3(hm)+Fe_2 + + H_2O = Fe_3O_4(mt)+2 H +;(4)富赤铁矿型铁矿既产于地壳深部,也产于地表。

项目成果

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Hiroshi Ohmoto其他文献

Characterization and Preclinical Evaluation of AS-1763, an Oral, Potent and Selective Noncovalent BTK Inhibitor, in Chronic Lymphocytic Leukemia
  • DOI:
    10.1182/blood-2023-189659
  • 发表时间:
    2023-11-02
  • 期刊:
  • 影响因子:
  • 作者:
    Shady I. Tantawy;Natalia Timofeeva;Hitomi Fujiwara;Mariko Hatakeyama;Breana Herrera;Lizbeth Loza;Tokiko Asami;Hiroshi Ohmoto;Kyoko Miyamoto;Yu Nishioka;Akinori Arimura;Masaaki Sawa;Nitin Jain;Varsha Gandhi
  • 通讯作者:
    Varsha Gandhi
Impact of Docirbrutinib (AS-1763) Treatment in CLL: Preclinical Data and Early Clinical Biomarkers
  • DOI:
    10.1182/blood-2024-210788
  • 发表时间:
    2024-11-05
  • 期刊:
  • 影响因子:
  • 作者:
    Natalia Timofeeva;Breana Herrera;Shady I. Tantawy;Hitomi Fujiwara;Lizbeth Loza;Mariko Hatakeyama;Tokiko Asami;Hiroshi Ohmoto;Kyoko Miyamoto;Yu Nishioka;Akinori Arimura;Masaaki Sawa;Nitin Jain;Varsha Gandhi
  • 通讯作者:
    Varsha Gandhi
Design and synthesis of novel thiazole-derivatives as potent ALK5 inhibitors.
设计和合成新型噻唑衍生物作为有效的 ALK5 抑制剂。
  • DOI:
  • 发表时间:
    2024
  • 期刊:
  • 影响因子:
    2.7
  • 作者:
    Mai Arai;Mitsuharu Hanada;H. Moriyama;Hiroshi Ohmoto;Takahiro Miyake;K. Naka;Masaaki Sawa
  • 通讯作者:
    Masaaki Sawa
Archaean palaeosols and Archaean air (reply)
太古代古土壤和太古代大气(回复)
  • DOI:
    10.1038/nature03168
  • 发表时间:
    2004-11-24
  • 期刊:
  • 影响因子:
    48.500
  • 作者:
    Hiroshi Ohmoto;Yumiko Watanabe
  • 通讯作者:
    Yumiko Watanabe

Hiroshi Ohmoto的其他文献

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{{ truncateString('Hiroshi Ohmoto', 18)}}的其他基金

Multiple Sulfur Isotope Fractionations during Thermal Decomposition of and Thermochemical Sulfate Reduction by Natural Organic Compounds
天然有机化合物热分解和热化学硫酸还原过程中的多种硫同位素分馏
  • 批准号:
    1024550
  • 财政年份:
    2010
  • 资助金额:
    $ 30.67万
  • 项目类别:
    Standard Grant
Origins of Gold, Uraninite, Pyrite, and Organic Matter in Conglomerates of Archean and Early Proterozoic Age
太古宙和早元古代砾岩中金、铀矿、黄铁矿和有机质的起源
  • 批准号:
    9706279
  • 财政年份:
    1997
  • 资助金额:
    $ 30.67万
  • 项目类别:
    Standard Grant
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
  • 财政年份:
    1990
  • 资助金额:
    $ 30.67万
  • 项目类别:
    Standard Grant
Sulfur Chemistry and Sulfate Reducing Bacteria of Archean Oceans
太古代海洋的硫化学和硫酸盐还原细菌
  • 批准号:
    9003554
  • 财政年份:
    1990
  • 资助金额:
    $ 30.67万
  • 项目类别:
    Standard Grant
Acquisition of a Mass Spectrometer and a Laser Ablation System for Micro-Analysis of Sulfur, Carbon, Oxygen, and Hydrogen Isotopic Compositions of Natural & Synthetic Sa
购买质谱仪和激光烧蚀系统,用于对天然硫、碳、氧和氢同位素成分进行微量分析
  • 批准号:
    8803720
  • 财政年份:
    1988
  • 资助金额:
    $ 30.67万
  • 项目类别:
    Standard Grant
Sulfur and Carbon Reactions in Hydrothermal Systems
水热系统中的硫和碳反应
  • 批准号:
    8508379
  • 财政年份:
    1985
  • 资助金额:
    $ 30.67万
  • 项目类别:
    Continuing Grant
Geochemical and Hydrological Processes for the Formation of Massive Sulfide Deposits
大量硫化物矿床形成的地球化学和水文过程
  • 批准号:
    8319402
  • 财政年份:
    1984
  • 资助金额:
    $ 30.67万
  • 项目类别:
    Continuing Grant
U.S.-Japan-Canada Cooperative Research Project on the Genesis of Volcanogenic Massive Sulfide Deposits
美国-日本-加拿大关于火山成因的块状硫化物矿床成因合作研究项目
  • 批准号:
    8109270
  • 财政年份:
    1981
  • 资助金额:
    $ 30.67万
  • 项目类别:
    Standard Grant
Stable Isotope Geochemistry of Hydrothermal Systems
热液系统的稳定同位素地球化学
  • 批准号:
    8007839
  • 财政年份:
    1980
  • 资助金额:
    $ 30.67万
  • 项目类别:
    Continuing Grant
Genesis of Volcanogenic Massive Sulfide Deposits
火山成因的块状硫化物矿床的成因
  • 批准号:
    7906779
  • 财政年份:
    1979
  • 资助金额:
    $ 30.67万
  • 项目类别:
    Standard Grant

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