Startseite The origin of trapiche-like inclusion patterns in quartz from Inner Mongolia, China
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The origin of trapiche-like inclusion patterns in quartz from Inner Mongolia, China

  • Gabriela A. Farfan ORCID logo , John Rakovan , Michael R. Ackerson , Benjamin J. Andrews ORCID logo und Jeffrey E. Post
Veröffentlicht/Copyright: 29. Oktober 2021
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 106 Heft 11

Abstract

Fibrous amphibole and clay mineral inclusions that form striking trapiche-like star patterns within quartz crystals from Inner Mongolia, China, present a challenge to uncover how these crystals grow and incorporate inclusions in a geological context. We propose that the patterns formed as a result of protogenic clay (ferrosaponite or nontronite) inclusions that were preferentially trapped on rough surfaces during quartz crystal growth. The rough surface texture of these crystals is the result of multiple growth centers during 2D nucleation and spread and split crystal formation. Observations via optical microscopy, cathodoluminescence, and three-dimensional micro-CT scanning highlight how the exterior surface textures on the termination of a complete quartz crystal mimic its interior inclusion patterns. Cathodoluminescence images, as well as varying aluminum concentrations along a core-to-exterior transect in a quartz crystal slice, suggest that the formation fluid underwent a heterogeneous chemical history. Measurements of Ti and observations of fluid inclusions suggest the quartz formed at a temperature of under 348 °C. This study presents the details surrounding split crystal growth in quartz in a natural geological setting, which has implications for inspiring new materials and may serve as an indicator for turbid and highly supersaturated formation fluid conditions in geological formations.

Keywords: Split crystal growth; quartz; inclusion incorporation; trapiche-like; Huanggang deposit; micro-CT scanning

Acknowledgments and Funding

The authors thank Bert Ottens for his insights on the Huanggang Mine in Inner Mongolia, China, the Smithsonian Institution Department of Mineral Sciences for the quartz samples, Greg Polley for photographing the quartz slices, Rob Wardell for slicing the samples, and for help with the luminoscope (CL) technique, and J.J. Hill for aiding with the micro-X‑ray CT scanning. We are grateful to Amir Akhavan and Associate Editor Maarten Broekmans for their detailed reviews and suggestions to improve this manuscript. Funding for G.F. and for this project was made possible by a Smithsonian Peter Buck Postdoctoral Fellowship and the Coralyn W. Whitney Curator Endowment.

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Received: 2020-01-31
Accepted: 2020-11-11
Published Online: 2021-10-29
Published in Print: 2021-11-25

© 2021 Mineralogical Society of America

Artikel in diesem Heft

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  2. First-principles Molecular Dynamics maps out complete mineral surface acidity landscape
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  10. Phase transitions in CaCO3 under hydrous and anhydrous conditions: Implications for the structural transformations of CaCO3 during subduction processes
  11. Strain-induced partial serpentinization of germanate olivine with a small amount of water
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  13. Upper temperature limits of orogenic gold deposit formation: Constraints from TiO2 polymorphs in the Dongyuan Au deposit, Jiangnan Orogen, China
  14. Formation of clinohumite ± spinel in dolomitic marbles from the Makrohar Granulite Belt, Central India: Evidence for Ti mobility during regional metamorphism
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https://doi.org/10.2138/am-2021-7454
Schlagwörter für diesen Artikel
Split crystal growth; quartz; inclusion incorporation; trapiche-like; Huanggang deposit; micro-CT scanning

Artikel in diesem Heft

  1. Highlights and Breakthroughs
  2. First-principles Molecular Dynamics maps out complete mineral surface acidity landscape
  3. Sulfur solubility in the Earth magma ocean—Testing the hypothesis of the “Hadean matte”
  4. Spectroscopic evidence for the Fe3+ spin transition in iron-bearing δ-AlOOH at high pressure
  5. Quantitative WDS compositional mapping using the electron microprobe
  6. Interfacial structures and acidity constants of goethite from first-principles Molecular Dynamics simulations
  7. Sound velocities of iron-nickel (Fe90Ni10) alloy up to 8 GPa and 773 K: The effect of nickel on the elastic properties of bcc-iron at high P-T
  8. Formation of metallic-Cu-bearing mineral assemblages in type-3 ordinary and CO chondrites
  9. Behavior and origin of hydrogen defects in natural orthopyroxene during high-temperature processes
  10. Phase transitions in CaCO3 under hydrous and anhydrous conditions: Implications for the structural transformations of CaCO3 during subduction processes
  11. Strain-induced partial serpentinization of germanate olivine with a small amount of water
  12. The origin of trapiche-like inclusion patterns in quartz from Inner Mongolia, China
  13. Upper temperature limits of orogenic gold deposit formation: Constraints from TiO2 polymorphs in the Dongyuan Au deposit, Jiangnan Orogen, China
  14. Formation of clinohumite ± spinel in dolomitic marbles from the Makrohar Granulite Belt, Central India: Evidence for Ti mobility during regional metamorphism
  15. Carletonmooreite, Ni3Si, a new silicide from the Norton County aubrite meteorite
  16. Sulfur content at sulfide saturation of peridotitic melt at upper mantle conditions
  17. Johnkoivulaite, Cs(Be2B)Mg2Si6O18, a new mineral of the beryl group from the gem deposits of Mogok, Myanmar
  18. Age determination of oriented rutile inclusions in sapphire and of moonstone from the Mogok metamorphic belt, Myanmar
  19. X-ray computed microtomography of diamondiferous impact suevitic breccia and clast-poor melt rock from the Kara astrobleme (Pay-Khoy, Russia)
  20. Book Review
  21. Book Review: Clays in the Minerals Processing Value Chain
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