Startseite Effects of small crystallite size on the thermal infrared (vibrational) spectra of minerals
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Effects of small crystallite size on the thermal infrared (vibrational) spectra of minerals

  • Victoria E. Hamilton ORCID logo EMAIL logo , Christopher W. Haberle ORCID logo und Thomas G. Mayerhöfer
Veröffentlicht/Copyright: 28. Oktober 2020
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Abstract

The thermal infrared (TIR, or vibrational) emission spectra of a suite of synthetic Mg-Fe olivines exhibit notable differences from their natural igneous counterparts in terms of their band shapes, relative depths, and reduced shifts in some band positions with Mg-Fe solid solution. Comparable reflectance spectra acquired from olivine-dominated matrices and fusion crusts of some carbonaceous chondrite meteorites exhibit similar deviations. Here we show that these unusual spectral characteristics are consistent with crystallite sizes much smaller than the resolution limit of infrared light. We hypothesize that these small crystallites denote abbreviated crystal growth and also may be linked to the size of nucleation sites. Other silicates and non-silicates, such as carbonates, exhibit similar spectral behaviors. Because the spectra of mineral separates are commonly used in the modeling and analysis of comparable bulk rock, meteorite, and remote sensing data, understanding these spectral variations is important to correctly identifying the minerals and interpreting the origin and/or secondary processing histories of natural materials.

Funding source: Smithsonian Institution

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Funding source: Johnson Space Center

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Funding statement: U.S. Antarctic meteorite samples are recovered by the Antarctic Search for Meteorites (ANSMET) program that has been funded by NSF and NASA, and characterized and curated by the Department of Mineral Sciences of the Smithsonian Institution and Astromaterials Curation Office at NASA Johnson Space Center.

Acknowledgments

Several colleagues participated in conversations that ultimately led to the understanding presented in this work: Phil Bland, Harold Connolly Jr. (contributor of the Allende thin section), Laurence Garvie, and Sasha Krot. Don Lindsley generously shared his knowledge about the synthetic samples whose spectra are shown here and he performed an XRD analysis of a different synthetic olivine that was informative but that we ultimately did not incorporate here. A.D. Rogers and C. Viviano provided valuable reviews that helped clarify several points in this manuscript.

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Received: 2020-05-12
Accepted: 2020-07-08
Published Online: 2020-10-28
Published in Print: 2020-11-25

© 2020 Walter de Gruyter GmbH, Berlin/Boston

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