cathodoluminescence study of calcite in martian meteorite t. nakazato, m. kayama, h. nishido, k....

13
Cathodoluminescence study Cathodoluminescence study of of Calcite in Calcite in Martian meteorite Martian meteorite T. Nakazato, M. Kayama, H. N ishido, K. Ninagawa, A. Gucs ik, and Sz. Bérczi Research Institute of Natural Science, Okayama University of Science Department of Applied Physics, Okayama University of Scien ce Max Planck Institute for Chemistry, Department of Geochemi stry NASA NASA

Upload: melinda-hood

Post on 01-Jan-2016

215 views

Category:

Documents


0 download

TRANSCRIPT

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.