Ductile deformation and development of andalusite microstructures in the Hongusan area: Constraints on the metamorphism and tectonics of the Ryoke Belt

DOI Web Site Web Site 被引用文献13件

書誌事項

公開日
2007-12-10
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1111/j.1440-1738.2007.00603.x
公開者
Wiley

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<jats:p><jats:bold>Abstract </jats:bold> The main mesoscopic features of the ductile deformation in the Hongusan region of the Ryoke Belt can be explained in terms of a single deformation phase, <jats:italic>Dm</jats:italic>. The associated stretching lineation is roughly east–west and has an associated top‐to‐the‐west sense of shear. This information fills an important gap in our knowledge about the deformational history of the Ryoke metamorphic belt. Andalusite porphyroblasts are well‐developed in the Hongusan area and their microstructure can be used to link the deformational history with the metamorphism. However, the andalusite porphyroblasts show both intertectonic and post‐tectonic microstructures. Some porphyroblasts have an intertectonic core and post‐tectonic rim. Analysis of associated metamorphic minerals and bulk‐rock chemistry suggests that the distinct types of microstructure can be explained in terms of distinct formation reactions related to regional and contact metamorphism. The intertectonic microstructure shows the presence of a deformation pre‐dating <jats:italic>Dm</jats:italic>, referred to as <jats:italic>Dc</jats:italic>. These two deformation stages are sufficient to account for all the main deformation features. The distribution of post‐tectonic andalusite growth shows a very broad thermal effect around an intrusion in the area. This can help place constraints on the thermal history of the Ryoke metamorphic belt.</jats:p>

収録刊行物

  • Island Arc

    Island Arc 17 (1), 41-56, 2007-12-10

    Wiley

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