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Crystallographic orientation relationships in host–inclusion systems: New insights from large EBSD data sets

  • Thomas A. Griffiths EMAIL logo , Gerlinde Habler and Rainer Abart
Published/Copyright: March 4, 2016
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American Mineralogist
From the journal American Mineralogist Volume 101 Issue 3

Abstract

Crystallographic orientation relationships (CORs) between mineral inclusions and their hosts could potentially deliver information about inclusion formation processes and conditions. Most previous studies are based on small numbers of analyses. This paper uses EBSD to study host–inclusion CORs in an inclusion-rich Permian metapegmatite garnet (Koralpe region, Eastern Alps, Austria), demonstrating the importance of large data sets and of EBSD in particular for the analysis of CORs. The distribution of measured orientations reflects host garnet point group symmetry for 89% of inclusions analyzed (total N = 530). Each inclusion phase (rutile, corundum, and ilmenite) shows at least three different CORs to host garnet. “Statistical” CORs are introduced to describe distributions of inclusion orientations that have one or two degrees of freedom with respect to the host, but still reflect host crystal symmetry. Two end-member characteristics of statistical CORs are distinguished: rotation and dispersion. Most statistical CORs observed show a mixture of both. Each inclusion phase shows at least one statistical COR. Multiple coexisting CORs and statistical CORs are not restricted to rutile. Re-examination of previous garnet–rutile COR studies in light of the new results indicates that COR information may have been overlooked when using small data sets. Variation in COR parameters correlates with broad differences in assumed metamorphic conditions for new and literature samples, suggesting that petrogenetic information may be available if COR formation can be understood. The favorability of the detected CORs cannot be explained by a simple model involving minimization of misfit between lattice planes, implying that other interface properties or the inclusion formation mechanism are important controls on COR development.

Keywords: Electron diffraction; corundum; garnet; ilmenite; rutile; pegmatites; metamorphic petrology; inclusions; electron microscopy; igneous petrology

Acknowledgments

The authors acknowledge funding by the University of Vienna doctoral school IK052 Deformation of Geological Materials (DOGMA) and the project of the Austrian Science Fund (FWF): I471-N19, as part of the international DFG-FWF funded research network FOR741-DACH. Helen M. Lang is thanked for providing information about the presumed source rocks of the Idaho star garnets.

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  1. Manuscript handled by Callum Hetherington.

Received: 2015-5-29
Accepted: 2015-10-18
Published Online: 2016-3-4
Published in Print: 2016-3-1

© 2016 by Walter de Gruyter Berlin/Boston

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https://doi.org/10.2138/am-2016-5442
Keywords for this article
Electron diffraction; corundum; garnet; ilmenite; rutile; pegmatites; metamorphic petrology; inclusions; electron microscopy; igneous petrology

Articles in the same Issue

  1. Editorial
  2. The most-cited journal in mineralogy and petrology (and what scientists can learn from baseball)
  3. Fluids in the Crust
  4. Fluids in the crust during regional metamorphism: Forty years in the Waterville limestone
  5. Research Article
  6. Remanent magnetization, magnetic coupling, and interface ionic configurations of intergrown rhombohedral and cubic Fe-Ti oxides: A short survey
  7. Research Article
  8. Are covalent bonds really directed?
  9. Dana Medal Paper
  10. Constraints on the early delivery and fractionation of Earth’s major volatiles from C/H, C/N, and C/S ratios
  11. Crossroads in Earth and Planetary Materials
  12. Octahedral chemistry of 2:1 clay minerals and hydroxyl band position in the near-infrared: Application to Mars
  13. Special Collection: Advances in Ultrahigh-Pressure Metamorphism
  14. Multi-stage barite crystallization in partially melted UHP eclogite from the Sulu belt, China
  15. Spinels Renaissance: The Past, Present, and Future of those Ubiquitous Minerals and Materials
  16. Crystal chemistry of spinels in the system MgAl2O4-MgV2O4-Mg2VO4
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  19. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  20. Evidence for dissolution-reprecipitation of apatite and preferential LREE mobility in carbonatite-derived late-stage hydrothermal processes
  21. Special Collection: Apatite: A Common Mineral, Uncommonly Versatile
  22. Compositional variation of apatite from rift-related alkaline igneous rocks of the Gardar Province, South Greenland
  23. Special Collection: Perspectives on Origins and Evolution of Crustal Magmas
  24. Dynamics and thermodynamics of magma mixing: Insights from a simple exploratory model
  25. Special Collection: From Magmas to Ore Deposits
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  32. In-situ infrared spectroscopic studies of hydroxyl in amphiboles at high pressure
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