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The effect of temperature and cataclastic deformation on the composition of upper crustal fluids — An experimental approach.

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Title: The effect of temperature and cataclastic deformation on the composition of upper crustal fluids — An experimental approach.
Authors: Burisch, Mathias1 mathias.burisch@ifg.uni-tuebingen.de, Marks, Michael A.W.1, Nowak, Marcus1, Markl, Gregor1
Source: Chemical Geology. Sep2016, Vol. 433, p24-35. 12p.
Subjects: Cataclastic rocks, Crystalline rocks, Fluids, Solution (Chemistry), Hydrothermal deposits, Temperature effect, Rock deformation
Abstract: We investigated the potential of common crystalline rocks to facilitate the geochemical evolution of continental basement brines and to serve as a metal source for hydrothermal ore deposits. We performed leaching experiments on typical crystalline basement rocks (granite and gneiss), a redbed sandstone and their mineral separates (feldspar, quartz and biotite) at variable T (25, 180, 275 and 350 °C), P (ambient pressure, 0.9, 1.4 and 1.9 kbar), grain-size fractions (< 0.01 mm, 0.063–0.125 and 2–4 mm) and variable fluid/rock ratios (10 to 1.1) with ultrapure water and 25 wt.% NaCl solution as solvents. The modification of the fluid chemistry during water–rock interaction strongly depends on grain-size: leachates (using pure H 2 O) of fine-grained rock powders have lower Na/Cl and Cl/Br ratios but much higher chlorinities (by a factor of up to 40) compared to leachates from coarse-grained rock powders. The Cl/Br ratios of all leachates are lower than that of their respective whole-rocks. Smaller grain-sizes of the starting materials yield element ratios (Cl/Br and Na/Cl) similar to those found in natural fluids, emphasizing the influence of cataclastic deformation on the fluid chemistry of crustal fluids. During our leaching experiments, Pb, Zn, Cu and W are released by felsic minerals, while biotite alteration releases Ni, As and additional Zn and Cu. Our experiments confirm that crystalline rocks may serve as metal source for hydrothermal ore deposits. Short-term water–rock interactions along cataclastic fault zones in the brittle crust may influence the geochemical evolution of upper crustal fluids. This is further suggested by low F/Cl and Cl/Br ratios in some of the leachates being very similar to halogen systematics in natural fluid samples. [ABSTRACT FROM AUTHOR]
Copyright of Chemical Geology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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  Data: The effect of temperature and cataclastic deformation on the composition of upper crustal fluids — An experimental approach.
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  Data: &lt;searchLink fieldCode=&quot;JN&quot; term=&quot;%22Chemical+Geology%22&quot;&gt;Chemical Geology&lt;/searchLink&gt;. Sep2016, Vol. 433, p24-35. 12p.
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  Data: &lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Cataclastic+rocks%22&quot;&gt;Cataclastic rocks&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Crystalline+rocks%22&quot;&gt;Crystalline rocks&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Fluids%22&quot;&gt;Fluids&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Solution+%28Chemistry%29%22&quot;&gt;Solution (Chemistry)&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Hydrothermal+deposits%22&quot;&gt;Hydrothermal deposits&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Temperature+effect%22&quot;&gt;Temperature effect&lt;/searchLink&gt;&lt;br /&gt;&lt;searchLink fieldCode=&quot;DE&quot; term=&quot;%22Rock+deformation%22&quot;&gt;Rock deformation&lt;/searchLink&gt;
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  Data: We investigated the potential of common crystalline rocks to facilitate the geochemical evolution of continental basement brines and to serve as a metal source for hydrothermal ore deposits. We performed leaching experiments on typical crystalline basement rocks (granite and gneiss), a redbed sandstone and their mineral separates (feldspar, quartz and biotite) at variable T (25, 180, 275 and 350 &#176;C), P (ambient pressure, 0.9, 1.4 and 1.9 kbar), grain-size fractions (&lt; 0.01 mm, 0.063–0.125 and 2–4 mm) and variable fluid/rock ratios (10 to 1.1) with ultrapure water and 25 wt.% NaCl solution as solvents. The modification of the fluid chemistry during water–rock interaction strongly depends on grain-size: leachates (using pure H 2 O) of fine-grained rock powders have lower Na/Cl and Cl/Br ratios but much higher chlorinities (by a factor of up to 40) compared to leachates from coarse-grained rock powders. The Cl/Br ratios of all leachates are lower than that of their respective whole-rocks. Smaller grain-sizes of the starting materials yield element ratios (Cl/Br and Na/Cl) similar to those found in natural fluids, emphasizing the influence of cataclastic deformation on the fluid chemistry of crustal fluids. During our leaching experiments, Pb, Zn, Cu and W are released by felsic minerals, while biotite alteration releases Ni, As and additional Zn and Cu. Our experiments confirm that crystalline rocks may serve as metal source for hydrothermal ore deposits. Short-term water–rock interactions along cataclastic fault zones in the brittle crust may influence the geochemical evolution of upper crustal fluids. This is further suggested by low F/Cl and Cl/Br ratios in some of the leachates being very similar to halogen systematics in natural fluid samples. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
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  Data: &lt;i&gt;Copyright of Chemical Geology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder&#39;s express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.&lt;/i&gt; (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.chemgeo.2016.03.031
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 12
        StartPage: 24
    Subjects:
      – SubjectFull: Cataclastic rocks
        Type: general
      – SubjectFull: Crystalline rocks
        Type: general
      – SubjectFull: Fluids
        Type: general
      – SubjectFull: Solution (Chemistry)
        Type: general
      – SubjectFull: Hydrothermal deposits
        Type: general
      – SubjectFull: Temperature effect
        Type: general
      – SubjectFull: Rock deformation
        Type: general
    Titles:
      – TitleFull: The effect of temperature and cataclastic deformation on the composition of upper crustal fluids — An experimental approach.
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            NameFull: Burisch, Mathias
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            NameFull: Marks, Michael A.W.
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            NameFull: Nowak, Marcus
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            NameFull: Markl, Gregor
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          Dates:
            – D: 01
              M: 09
              Text: Sep2016
              Type: published
              Y: 2016
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              Value: 433
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            – TitleFull: Chemical Geology
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