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Middle Archean ocean ridge hydrothermal metamorphism and alteration recorded in the Cleaverville area, Pilbara Craton, Western Australia.

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Title: Middle Archean ocean ridge hydrothermal metamorphism and alteration recorded in the Cleaverville area, Pilbara Craton, Western Australia.
Authors: SHIBUYA, T.1, KITAJIMA, K.1, KOMIYA, T.1, TERABAYASHI, M.2, MARUYAMA, S.1
Source: Journal of Metamorphic Geology. Sep2007, Vol. 25 Issue 7, p751-767. 17p. 3 Color Photographs, 3 Diagrams, 1 Chart, 5 Graphs, 1 Map.
Subjects: Geological research, Metamorphic rocks, Archaean stratigraphic geology, Low pressure (Science), Metamorphism (Geology), Ocean bottom
Geographic Terms: Western Australia
Abstract: A hydrothermally metamorphosed greenstone complex, capped by bedded cherts and banded iron formations (BIFs), is exposed in the Cleaverville area, Pilbara Craton, Western Australia. It has been interpreted as an accretionary complex characterized by both a duplex structure and an oceanic plate stratigraphy, and is shown to represent a 3.2 Ga upper oceanic crust. Three metamorphic zones are identified in the basaltic greenstones. The metamorphic grade increases from sub-greenschist facies (zones A and B) to greenschist facies (zone C) under low-pressure conditions. The boundaries between three mineral zones are subparallel to the bedding plane of overlying chert/BIF, and metamorphic temperature increases stratigraphically downward. The zones correspond to the thermal structure of ocean-floor metamorphism, at a mid-ocean ridge. The uppermost greenstone in the study area is more pervasively altered and carbonatized than the modern upper oceanic crust. This indicates the enrichment of CO2 in the metamorphic fluid by which widespread formation of carbonate occurred, compared with a narrow stability region of Ca-Al silicates. It is, therefore, suggested that the Archean hydrothermal alteration played a more important role in fixation of CO2 than present-day ocean-ridge hydrothermal alteration, as an interaction between sea water and oceanic crust. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Metamorphic Geology is the property of Wiley-Blackwell 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.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 26360730
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Middle Archean ocean ridge hydrothermal metamorphism and alteration recorded in the Cleaverville area, Pilbara Craton, Western Australia.
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Metamorphic+Geology%22">Journal of Metamorphic Geology</searchLink>. Sep2007, Vol. 25 Issue 7, p751-767. 17p. 3 Color Photographs, 3 Diagrams, 1 Chart, 5 Graphs, 1 Map.
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  Data: <searchLink fieldCode="DE" term="%22Geological+research%22">Geological research</searchLink><br /><searchLink fieldCode="DE" term="%22Metamorphic+rocks%22">Metamorphic rocks</searchLink><br /><searchLink fieldCode="DE" term="%22Archaean+stratigraphic+geology%22">Archaean stratigraphic geology</searchLink><br /><searchLink fieldCode="DE" term="%22Low+pressure+%28Science%29%22">Low pressure (Science)</searchLink><br /><searchLink fieldCode="DE" term="%22Metamorphism+%28Geology%29%22">Metamorphism (Geology)</searchLink><br /><searchLink fieldCode="DE" term="%22Ocean+bottom%22">Ocean bottom</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Western+Australia%22">Western Australia</searchLink>
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  Label: Abstract
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  Data: A hydrothermally metamorphosed greenstone complex, capped by bedded cherts and banded iron formations (BIFs), is exposed in the Cleaverville area, Pilbara Craton, Western Australia. It has been interpreted as an accretionary complex characterized by both a duplex structure and an oceanic plate stratigraphy, and is shown to represent a 3.2 Ga upper oceanic crust. Three metamorphic zones are identified in the basaltic greenstones. The metamorphic grade increases from sub-greenschist facies (zones A and B) to greenschist facies (zone C) under low-pressure conditions. The boundaries between three mineral zones are subparallel to the bedding plane of overlying chert/BIF, and metamorphic temperature increases stratigraphically downward. The zones correspond to the thermal structure of ocean-floor metamorphism, at a mid-ocean ridge. The uppermost greenstone in the study area is more pervasively altered and carbonatized than the modern upper oceanic crust. This indicates the enrichment of CO2 in the metamorphic fluid by which widespread formation of carbonate occurred, compared with a narrow stability region of Ca-Al silicates. It is, therefore, suggested that the Archean hydrothermal alteration played a more important role in fixation of CO2 than present-day ocean-ridge hydrothermal alteration, as an interaction between sea water and oceanic crust. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Journal of Metamorphic Geology is the property of Wiley-Blackwell 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.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1111/j.1525-1314.2007.00725.x
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      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 17
        StartPage: 751
    Subjects:
      – SubjectFull: Geological research
        Type: general
      – SubjectFull: Metamorphic rocks
        Type: general
      – SubjectFull: Archaean stratigraphic geology
        Type: general
      – SubjectFull: Low pressure (Science)
        Type: general
      – SubjectFull: Metamorphism (Geology)
        Type: general
      – SubjectFull: Ocean bottom
        Type: general
      – SubjectFull: Western Australia
        Type: general
    Titles:
      – TitleFull: Middle Archean ocean ridge hydrothermal metamorphism and alteration recorded in the Cleaverville area, Pilbara Craton, Western Australia.
        Type: main
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          Name:
            NameFull: SHIBUYA, T.
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            NameFull: KITAJIMA, K.
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            NameFull: KOMIYA, T.
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            NameFull: TERABAYASHI, M.
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            NameFull: MARUYAMA, S.
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            – D: 01
              M: 09
              Text: Sep2007
              Type: published
              Y: 2007
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              Value: 02634929
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              Value: 25
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              Value: 7
          Titles:
            – TitleFull: Journal of Metamorphic Geology
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