Cathodoluminescence study of Cathodoluminescence study of Calcite in Martian Calcite in Martian meteoritemeteorite
T. Nakazato, M. Kayama, H. Nishido, K. Ninagawa, A. Gucsik, and Sz. Bérczi
Research Institute of Natural Science, Okayama University of Science
Department of Applied Physics, Okayama University of Science
Max Planck Institute for Chemistry, Department of Geochemistry
Eötvös University, Institute of Physics, Dept. G. Physics, Cosmic Materials Space
NASA
NASA
Introduction
CL and Raman spectroscopy were carried out on Dhofar 019 for origin of calcite.
NASA
NASA NASA
SNC : SNC : Martian Martian meteoritesmeteorites
Nakhlite
Shergottite
Chassignite
•Olivine bearing Basaltic Shergottite Augite , Pigeonite , Maskelynite
•Lherzolitic Shergottite Olivine , Pyroxene
Shergottite 1865 India Shergotty
Nakhlite 1911 Egypt Nakhla
Chassignite 1815 France Chassgny
Shergottite
Classification : Olivine bearing Basaltic Shergottite Constituent minerals : Pyroxene, Olivine, Maskelynit
e, merrillite and calcite Shock pressure : 30 GPa or more Formation age : ~ 500Ma Exposure age : ~ 15 million years Finding : Oman desert Weight : 1,056 g No fusion crust
Photograph of Dhofar 019
Sample (Dhofar 019)
Dhofar region
5mm
Color CL images of Dhofar 019
Color CL image of Dhofar 019
: measured area Vein
S
L
measurement condition15kv, 1.0nA
CL spectra of calcite ( S and L )
S
L
BSE image of calcite (S , L)
CL spectra of calcite (S and L)
BSE image of calcite (Vein)
CL spectrum of calcite ( Vein )
Vein
CL spectrum of calcite (Vein)
measurement condition15kv, 1.0nA
BSE image of calcite (Vein)
CL spectra of calciteS
L
BSE image of calcite (S and L)
VeinCL spectra of calcite in Dhofar019 and terrestrial calcite
Raman spectra of calcite
200 400 600 800 1000 1200 1400 1600
Raman
intensity
(a.u.)
Ramanshift (cm-1)
TerrestrialVeinSL
Raman spectra of calcite in Dhofar019 and terrestrial calcite
measurement condition
light source : Ar-laser, 514.5nmpower : 400 mW
Terrestrial
(cm-1)
154
281
713
1087
1438
Vein
(cm-1)
154
281
713
1087
1438
S
(cm-1)
151
276
712
1086
---
L
(cm-1)
143
266
712
1084
---
Raman peak shift of calcite
Wave numbers of Raman peaks
Terrestrial
(cm-1)
154
281
713
1087
1438
Vein
(cm-1)
154
281
713
1087
1438
S
(cm-1)
151
276
712
1086
---
L
(cm-1)
143
266
712
1084
---
Raman peak shift of calcite
Wave numbers of Raman peaks
ConclusionConclusionCL spectra• Calcite in Dhofar 019 shows different spectra from
terrestrial one.
Raman spectra• Calcite in Dhofar 019 show weaker Raman peak than
terrestrial one.
Calcite in Dhofar019 Martian origin
Thank you, very much.