Evaporatic-source model for igneous-related Fe oxide (REE-Cu-Au-U) mineralization

Barton, M D; Johnson, D A

doi:10.1130/0091-7613(1996)024<0259:ESMFIR>2.3.CO;2

Title: Evaporatic-source model for igneous-related Fe oxide (REE-Cu-Au-U) mineralization

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Abstract

We propose that many igneous-related Fe oxide-rich (REE-Cu-Au-U-bearing) deposits form by hydrothermal processes involving evaporitic ligand sources, either coeval salars or older evaporites. These deposits are abundant in both Phanerozoic and Proterozoic extensional continental and continent-margin settings. They commonly form in global arid zones, but they also occur where magmatism is superimposed upon older evaporites. Magmatic compositions exert only second-order control, mainly on alteration mineralogy and on element abundances. Hot S-poor brines generated by interaction with evaporitic materials are consistent with geologic settings and help rationalize the distinctive element enrichments (siderophile, lithophile) and hydrothermal alteration (sodic, locally alkaline) found in these systems. This model contrasts with immiscible oxide melt and magmatic-hydrothermal origins commonly proposed for these deposits, although all three mechanisms can occur. 31 refs., 3 figs., 1 tab.

Authors:

Barton, M D; Johnson, D A ^[1]

Univ. of Arizona, Tucson, AZ (United States)

Publication Date:: Fri Mar 01 00:00:00 EST 1996

OSTI Identifier:: 420921

Resource Type:: Journal Article

Journal Name:: Geology

Additional Journal Information:: Journal Volume: 24; Journal Issue: 3; Other Information: PBD: Mar 1996

Country of Publication:: United States

Language:: English

Subject:: 58 GEOSCIENCES; 36 MATERIALS SCIENCE; 40 CHEMISTRY; IRON OXIDES; MINERALIZATION; GEOLOGIC DEPOSITS; GEOCHEMISTRY; GEOLOGY; CONTINENTAL MARGIN; EVAPORITES; MAGMATISM; URANIUM MINERALS; IGNEOUS ROCKS

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                    Barton, M D, and Johnson, D A. Evaporatic-source model for igneous-related Fe oxide (REE-Cu-Au-U) mineralization.  United States: N. p., 1996. 
        Web.  doi:10.1130/0091-7613(1996)024<0259:ESMFIR>2.3.CO;2.

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                    Barton, M D, & Johnson, D A. Evaporatic-source model for igneous-related Fe oxide (REE-Cu-Au-U) mineralization.  United States.  https://doi.org/10.1130/0091-7613(1996)024<0259:ESMFIR>2.3.CO;2

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                    Barton, M D, and Johnson, D A. 1996.  
        "Evaporatic-source model for igneous-related Fe oxide (REE-Cu-Au-U) mineralization".  United States.  https://doi.org/10.1130/0091-7613(1996)024<0259:ESMFIR>2.3.CO;2.

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@article{osti_420921,

  title        = {Evaporatic-source model for igneous-related Fe oxide (REE-Cu-Au-U) mineralization},

  author       = {Barton, M D and Johnson, D A},

  abstractNote = {We propose that many igneous-related Fe oxide-rich (REE-Cu-Au-U-bearing) deposits form by hydrothermal processes involving evaporitic ligand sources, either coeval salars or older evaporites. These deposits are abundant in both Phanerozoic and Proterozoic extensional continental and continent-margin settings. They commonly form in global arid zones, but they also occur where magmatism is superimposed upon older evaporites. Magmatic compositions exert only second-order control, mainly on alteration mineralogy and on element abundances. Hot S-poor brines generated by interaction with evaporitic materials are consistent with geologic settings and help rationalize the distinctive element enrichments (siderophile, lithophile) and hydrothermal alteration (sodic, locally alkaline) found in these systems. This model contrasts with immiscible oxide melt and magmatic-hydrothermal origins commonly proposed for these deposits, although all three mechanisms can occur. 31 refs., 3 figs., 1 tab.},

  doi          = {10.1130/0091-7613(1996)024<0259:ESMFIR>2.3.CO;2},

  url          = {https://www.osti.gov/biblio/420921},
  journal      = {Geology},
number       = 3,

  volume       = 24,

  place        = {United States},

  year         = {Fri Mar 01 00:00:00 EST 1996},

  month        = {Fri Mar 01 00:00:00 EST 1996}

}

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https://doi.org/10.1130/0091-7613(1996)024<0259:ESMFIR>2.3.CO;2

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