Water release and homogenization by dynamic recrystallization of quartz

DOI DOI PDF 被引用文献2件 参考文献84件 オープンアクセス

書誌事項

公開日
2023-01-02
資源種別
journal article
権利情報
  • https://creativecommons.org/licenses/by/4.0/
DOI
  • 10.5194/egusphere-2022-1487
  • 10.5194/se-14-409-2023
公開者
Copernicus GmbH

説明

<jats:p>Abstract. To evaluate changes in water distribution generated by dynamic recrystallization of quartz, we performed infrared (IR) spectroscopy mapping of quartz in deformed granite from the Wariyama uplift zone in NE Japan. We analyzed three granite samples with different degrees of deformation: almost undeformed, weakly deformed, and strongly deformed. Dynamically recrystallized quartz grains with a grain size of ~10 µm are found in these three samples, but the percentages of recrystallized grains and recrystallization processes are different. Quartz in the almost undeformed sample shows wavy grain boundaries with a few bulged quartz grains. In the weakly deformed sample, bulging of quartz is developed in regions a few hundred micrometers from adjacent host quartz grains. In the strongly deformed sample, almost all quartz grains are recrystallized by subgrain rotation. IR spectra of quartz in the three samples commonly show a broad water band owing to H2O fluid at 2800–3750 cm−1 with no structural OH bands. Water contents in host quartz grains in the almost undeformed sample are in the range of 40–1750 wt. ppm, with a mean of 500 ± 280 wt. ppm H2O. On the other hand, water contents in regions of recrystallized grains, regardless of the recrystallization processes involved, are in the range of 100–510 wt. ppm, with a mean of 220 ± 70 wt. ppm, which are low and homogeneous compared with contents in host quartz grains. Water contents in regions of subgrains are intermediate between those in host and recrystallized grains. These results for water distribution in quartz imply that water is released by dynamic recrystallization.</jats:p>

収録刊行物

  • Solid Earth

    Solid Earth 14 (4), 409-424, 2023-01-02

    Copernicus GmbH

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