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Establishing the P–T path for Alpine Schist, Southern Alps near Hokitika, New Zealand.

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Title: Establishing the P–T path for Alpine Schist, Southern Alps near Hokitika, New Zealand.
Authors: Vry, J. K.1 julie.vry@vuw.ac.nz, Powell, R.2, Williams, J.1
Source: Journal of Metamorphic Geology. Jan2008, Vol. 26 Issue 1, p81-97. 17p. 2 Diagrams, 4 Charts, 10 Graphs, 1 Map.
Subjects: Schists, Metamorphism (Geology), Garnet, Gems & precious stones, Zoning
Geographic Terms: New Zealand
Abstract: Pressure–temperature pseudosections for ‘greyschist’ (metamorphosed greywacke and argillite) from the Alpine Schist (Haast Schist group) near Hokitika (Southern Alps, New Zealand) are used to gain new insights into its metamorphic history. The rocks were metamorphosed at relatively low-grade conditions associated with the first appearance and initial growth of garnet in the stability field of albite. The measured and predicted garnet compositional zoning data are used to construct an overall P–T path by combining P–T path results from nearby rocks that have a range of MnO contents. The P–T path obtained is steep from ∼380 °C/2.5 kbar up to ∼490 °C/8.5 kbar, then recurves sharply with garnet growth continuing during early decompression to ∼500 °C/6.5 kbar. Most garnet growth in the study area took place in the stability field of albite, with oligoclase appearing only during decompression, when the peristerite gap was entered. On appearance of oligoclase, there is a marked decrease in the CaO content of garnet. The preservation of mineral assemblages from near-peak temperature conditions can be understood in terms of the P–T path subsequently becoming tangential to water content contours, during cooling with further decompression. [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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DbLabel: Engineering Source
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PubTypeId: academicJournal
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  Data: Establishing the P–T path for Alpine Schist, Southern Alps near Hokitika, New Zealand.
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Metamorphic+Geology%22">Journal of Metamorphic Geology</searchLink>. Jan2008, Vol. 26 Issue 1, p81-97. 17p. 2 Diagrams, 4 Charts, 10 Graphs, 1 Map.
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  Data: <searchLink fieldCode="DE" term="%22Schists%22">Schists</searchLink><br /><searchLink fieldCode="DE" term="%22Metamorphism+%28Geology%29%22">Metamorphism (Geology)</searchLink><br /><searchLink fieldCode="DE" term="%22Garnet%22">Garnet</searchLink><br /><searchLink fieldCode="DE" term="%22Gems+%26+precious+stones%22">Gems & precious stones</searchLink><br /><searchLink fieldCode="DE" term="%22Zoning%22">Zoning</searchLink>
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  Data: Pressure–temperature pseudosections for ‘greyschist’ (metamorphosed greywacke and argillite) from the Alpine Schist (Haast Schist group) near Hokitika (Southern Alps, New Zealand) are used to gain new insights into its metamorphic history. The rocks were metamorphosed at relatively low-grade conditions associated with the first appearance and initial growth of garnet in the stability field of albite. The measured and predicted garnet compositional zoning data are used to construct an overall P–T path by combining P–T path results from nearby rocks that have a range of MnO contents. The P–T path obtained is steep from ∼380 °C/2.5 kbar up to ∼490 °C/8.5 kbar, then recurves sharply with garnet growth continuing during early decompression to ∼500 °C/6.5 kbar. Most garnet growth in the study area took place in the stability field of albite, with oligoclase appearing only during decompression, when the peristerite gap was entered. On appearance of oligoclase, there is a marked decrease in the CaO content of garnet. The preservation of mineral assemblages from near-peak temperature conditions can be understood in terms of the P–T path subsequently becoming tangential to water content contours, during cooling with further decompression. [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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      – Type: doi
        Value: 10.1111/j.1525-1314.2007.00746.x
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 17
        StartPage: 81
    Subjects:
      – SubjectFull: Schists
        Type: general
      – SubjectFull: Metamorphism (Geology)
        Type: general
      – SubjectFull: Garnet
        Type: general
      – SubjectFull: Gems & precious stones
        Type: general
      – SubjectFull: Zoning
        Type: general
      – SubjectFull: New Zealand
        Type: general
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      – TitleFull: Establishing the P–T path for Alpine Schist, Southern Alps near Hokitika, New Zealand.
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            NameFull: Vry, J. K.
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            NameFull: Powell, R.
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              Text: Jan2008
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              Y: 2008
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