Startseite An integrated EPMA-EBSD study of metamorphic histories recorded in garnet
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An integrated EPMA-EBSD study of metamorphic histories recorded in garnet

  • Masaki Enami EMAIL logo , Takayoshi Nagaya und Maw Maw Win
Veröffentlicht/Copyright: 3. Januar 2017
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 102 Heft 1

Abstract

Growth histories recorded in garnet grains in metasedimentary rocks from the Sanbagawa belt in Japan and the Mogok belt in Myanmar were analyzed using an effective combination of electron backscatter diffraction (EBSD) and electron probe microanalysis (EPMA) data. Garnet in the Sanbagawa metapelite has inner and outer zones that formed in the eclogite and epidote-amphibolite facies stages, respectively. Based on EPMA element mapping, this garnet appears to have grown as a single crystal with a temporal break in growth between the inner and outer zones that occurred during exhumation. The EBSD data, however, document that the garnet grain is composed of four domains. The misorientation angles of crystallographic orientations between the domains are as large as 59°, and domain boundaries crosscut the growth zoning and the compositional boundary between the inner and outer zones. Sets of quartz grains included in the garnets on either side of the domain boundaries sometimes share the same crystallographic orientation with misorientation angles less than 4°. The garnet grains formed via a three-step process of prograde crystallization of polycrystalline garnet during the eclogite facies stage (inner zone) → resorption around garnet rims and along domain boundaries during exhumation → crystallization of the outer zone and in the domain boundaries during the prograde epidote-amphibolite facies stage.

The garnet porphyroblasts in the Mogok pelitic gneisses, which formed during prograde metamorphism to the upper amphibolite-granulite facies (0.6–1.0 GPa/780–850 °C), are now separated into segments of various sizes by mosaic or symplectite aggregates of biotite, plagioclase, and quartz or monomineralic biotite veins. The segment texture formed at about 0.3–0.4 GPa/610–650 °C or lowergrade conditions. The EBSD analysis shows that most of the segments share the same crystallographic orientation with misorientation angles less than 4° and show no evidence of deformation and/or rotation processes after segmentation. These data suggest that the Mogok sample did not experience dynamic deformation of the garnet grains after the resorption and segmentation stage and may have been exhumed under static conditions from depths of 9–12 km.

Keywords: EBSD; EPMA; garnet; polycrystals; growth process; metamorphism

Acknowledgments

Valuable and constructive comments by D.L. Whitney, T.A. Griffiths, and C. Hetherington greatly helped to improve this manuscript. We thank D. Mainprice for providing the software to analyze the EBSD data. This research was partially supported by Grant-in-Aids for Scientific Research (M.E., 25400511; T.N., 13J00199 and 16J01480) from the Japan Society for the Promotion of Science (JSPS) and a scholarship (MMW) from Ministry of Education, Culture, Sports, Science and Technology in Japan (MEXT).

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Received: 2015-12-28
Accepted: 2016-8-29
Published Online: 2017-1-3
Published in Print: 2017-1-1

© 2017 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2017-5666
Schlagwörter für diesen Artikel
EBSD; EPMA; garnet; polycrystals; growth process; metamorphism

Artikel in diesem Heft

  1. Highlights and Breakthroughs
  2. Periodic activity in continental magmatic arcs
  3. Highlights and Breakthroughs
  4. Early warning signs for mining accidents: Detecting crackling noise
  5. Review
  6. Fluids and trace element transport in subduction zones
  7. Solved: The enigma of labradorite feldspar with incommensurately modulated structure
  8. Solved: The enigma of labradorite feldspar with incommensurately modulated structure
  9. Special Collection: Earth Analogs for Martian Geological Materials and Processes
  10. Formation of the ferruginous smectite SWa-1 by alteration of soil clays
  11. Special Collection: Advances in Ultrahigh-Pressure Metamorphism
  12. Dissolving dolomite in a stable UHP mineral assemblage: Evidence from Cal-Dol marbles of the Dora-Maira Massif (Italian Western Alps)
  13. Special collection: Apatite: a common mineral, uncommonly versatile
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  15. Special collection: Apatite: a common mineral, uncommonly versatile
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