TY - JOUR
T1 - Cathodoluminescence of high-pressure feldspar minerals as a shock barometer
AU - Kayama, Masahiro
AU - Sekine, Toshimori
AU - Tomioka, Naotaka
AU - Nishido, Hirotsugu
AU - Kato, Yukako
AU - Ninagawa, Kiyotaka
AU - Kobayashi, Takamichi
AU - Yamaguchi, Akira
N1 - Funding Information:
We are deeply indebted to Dr. D. Yamazaki (Institute for Study of the Earth's Interior Okayama University, Japan) for synthesis of K-lingunite using multianvil press and the allocation for this study. We thank Mr. Y. Shibata (Technical center, Hiroshima University, Hiroshima, Japan) for EPMA analysis using JXA-8200 at the Natural Science Center for Basic Research and Development (N-BARD), Hiroshima University. We also appreciate the National Institute of Polar Research (Tokyo, Japan) for kindly allocating the Yamato-790729 sample. Part of this work was supported by JSPS KAKENHI Grant Number 25800294.
Funding Information:
Acknowledgments—We are deeply indebted to Dr. D. Yamazaki (Institute for Study of the Earth’s Interior Okayama University, Japan) for synthesis of K-lingunite using multianvil press and the allocation for this study. We thank Mr. Y. Shibata (Technical center, Hiroshima University, Hiroshima, Japan) for EPMA analysis using JXA-8200 at the Natural Science Center for Basic Research and Development (N-BARD), Hiroshima University. We also appreciate the National Institute of Polar Research (Tokyo, Japan) for kindly allocating the Yamato-790729 sample. Part of this work was supported by JSPS KAKENHI Grant Number 25800294.
Publisher Copyright:
© The Meteoritical Society, 2018.
PY - 2018/7
Y1 - 2018/7
N2 - Cathodoluminescence (CL) analyses were carried out on maskelynite and lingunite in L6 chondrites of Tenham and Yamato-790729. Under CL microscopy, bright blue emission was observed in Na-lingunite in the shock veins. Dull blue-emitting maskelynite is adjacent to the shock veins, and aqua blue luminescent plagioclase lies farther away. CL spectroscopy of the Na-lingunite showed emission bands centered at ~330, 360–380, and ~590 nm. CL spectra of maskelynite consisted of emission bands at ~330 and ~380 nm. Only an emission band at 420 nm was recognized in crystalline plagioclase. Deconvolution of CL spectra from maskelynite successfully separated the UV–blue emission bands into Gaussian components at 3.88, 3.26, and 2.95 eV. For comparison, we prepared K-lingunite and experimentally shock-recovered feldspars at the known shock pressures of 11.1–41.2 GPa to measure CL spectra. Synthetic K-lingunite has similar UV–blue and characteristic yellow bands at ~550, ~660, ~720, ~750, and ~770 nm. The UV–blue emissions of shock-recovered feldspars and the diaplectic feldspar glasses show a good correlation between intensity and shock pressure after deconvolution. They may be assigned to pressure-induced defects in Si and Al octahedra and tetrahedra. The components at 3.88 and 3.26 eV were detectable in the lingunite, both of which may be caused by the defects in Si and Al octahedra, the same as maskelynite. CL of maskelynite and lingunite may be applicable to estimate shock pressure for feldspar-bearing meteorites, impactites, and samples returned by spacecraft mission, although we need to develop more as a reliable shock barometer.
AB - Cathodoluminescence (CL) analyses were carried out on maskelynite and lingunite in L6 chondrites of Tenham and Yamato-790729. Under CL microscopy, bright blue emission was observed in Na-lingunite in the shock veins. Dull blue-emitting maskelynite is adjacent to the shock veins, and aqua blue luminescent plagioclase lies farther away. CL spectroscopy of the Na-lingunite showed emission bands centered at ~330, 360–380, and ~590 nm. CL spectra of maskelynite consisted of emission bands at ~330 and ~380 nm. Only an emission band at 420 nm was recognized in crystalline plagioclase. Deconvolution of CL spectra from maskelynite successfully separated the UV–blue emission bands into Gaussian components at 3.88, 3.26, and 2.95 eV. For comparison, we prepared K-lingunite and experimentally shock-recovered feldspars at the known shock pressures of 11.1–41.2 GPa to measure CL spectra. Synthetic K-lingunite has similar UV–blue and characteristic yellow bands at ~550, ~660, ~720, ~750, and ~770 nm. The UV–blue emissions of shock-recovered feldspars and the diaplectic feldspar glasses show a good correlation between intensity and shock pressure after deconvolution. They may be assigned to pressure-induced defects in Si and Al octahedra and tetrahedra. The components at 3.88 and 3.26 eV were detectable in the lingunite, both of which may be caused by the defects in Si and Al octahedra, the same as maskelynite. CL of maskelynite and lingunite may be applicable to estimate shock pressure for feldspar-bearing meteorites, impactites, and samples returned by spacecraft mission, although we need to develop more as a reliable shock barometer.
UR - http://www.scopus.com/inward/record.url?scp=85045390676&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85045390676&partnerID=8YFLogxK
U2 - 10.1111/maps.13092
DO - 10.1111/maps.13092
M3 - Article
AN - SCOPUS:85045390676
VL - 53
SP - 1476
EP - 1488
JO - Meteoritics and Planetary Science
JF - Meteoritics and Planetary Science
SN - 1086-9379
IS - 7
ER -