Conference on Solar System Cosmochemistry and Planetary Science Studies in Hungary

(September 4, 2008)

New Application of Cathodoluminescence New Application of Cathodoluminescence

to Earth and Planetary Sciencesto Earth and Planetary Sciences

H.Nishido, M.Kayama,

T.Okumura and K.Ninagawa

(collaborated with Dr. Gucsik)

Okayama University of ScienceRASC

Type of luminescence Excitation source 　　 Application to geosciences　

　 Thermoluminescence (TL) Thermal energy Dosimeter, Dating　　 Optically Stimulated Luminescence (OSL) Visible light Dosimeter, Dating　

　 Photoluminescence (PL) Ultraviolet radiation Mining exploration　　　 Cathodoluminescence (CL) Electrons Fabric and domain analysis　　　 Roentgenoluminescence (RL) X-rays Dosimeter　　　 Ionoluminescence Ions Dosimeter 　

　 Chemiluminescence Chemical reactions Water circulation analysis　　 Bioluminescence Biochemical reactions Detection of micro biomats　　　 Triboluminescence Shear stress Bedrock monitoring sensor

Different types of luminescence

Type of luminescence Excitation source 　　 Application to geosciences　

　 Thermoluminescence (TL) Thermal energy Dosimeter, Dating　　 Optically Stimulated Luminescence (OSL) Visible light Dosimeter, Dating　

　 Photoluminescence (PL) Ultraviolet radiation Mining exploration　　　 Cathodoluminescence (CL) Electrons Fabric and domain analysis　　　 Roentgenoluminescence (RL) X-rays Dosimeter　　　 Ionoluminescence Ions Dosimeter 　

　 Chemiluminescence Chemical reactions Water circulation analysis

　　 Bioluminescence Biochemical reactions Detection of micro biomats　　　 Triboluminescence Shear stress Bedrock monitoring sensor

Different types of luminescence

Type of luminescence Excitation source 　　 Application to geosciences　

　 Thermoluminescence (TL) Thermal energy Dosimeter, Dating　　 Optically Stimulated Luminescence (OSL) Visible light Dosimeter, Dating　

　 Photoluminescence (PL) Ultraviolet radiation Mining exploration　　　 Cathodoluminescence (CL) Electrons Fabric and domain analysis　　　 Roentgenoluminescence (RL) X-rays Dosimeter　　　 Ionoluminescence Ions Dosimeter 　

　 Chemiluminescence Chemical reactions Water circulation analysis

　　 Bioluminescence Biochemical reactions Detection of micro biomats　　　 Triboluminescence Shear stress Bedrock monitoring sensor

Different types of luminescence

Quartz images by polarizing microscopy (Polmi)

and SEM‐CL microscopy (CL), Götze (2000).

Luminoscope ELM-3R (Nuclide Co. ）

Cooled-CCD system ： DS-5Mc 　 (Nikon

Co.)

Optical system: Video lens (Edmund Co.)

・ Color imaging of CL

・ Comparison with petrological observation

Cold-cathode type CL instrument (Luminoscope)

E-type chondrite (Y-86004) width: 4.5 mm

Courtesy of Prof. Ninagawa

Phase I

Phase II

Phase III

CL 　 image 　 of 　 Antarctic meteorite

SEM ： JSM-5410LV （ JEOL Co. ）Monochromator ： Mono CL2 （ Oxford Instruments Co. ）PMT ： 　R2228 （ Hamamatsu Photonics Co. ）Wavelength ： 300 ～ 800 nmResolution ： 0.5 nmTemperature ： -196 ～ 400 C

Monochromator

・ CL spectral measurement

・ Comparison with SEM and BSE images, linked to EPMA

Hot-cathode type CL instrument (SEM-CL)

CL characterization of zoned zircon

A

B

C

D

Zircon from Osayama, Okayama Pref., Japan

A: Luminoscope CL image; B: Mono-CL image; C: CL spectral measurement positions; D: CL spectra

Conditions of shock metamorphism (from French, 1998)

shatter cone

Barringer impact crater, Arizona

Shocked quatrz

Meteor Impact 　→　 shock meatmorphism

　　　　 PF (Planar Fractures)　　　　 PDFs (Planar Deformation Features)

・ Conventional methods ：　 Optical observation ， TEM etc

・ New methods ：　 CL imaging and spectroscopy,

　　　　　　　　　　 Micro-Raman spectroscopy

Quartz

100 m 50 m

PDFsPF

PF and PDFs in quartz grains from Ries crater

Geological setting

Location map

Geological map

Occurrence

a: viewing from NE to SW; b: outcrop; c: chert vein

Sampling location map

Polarized microscope images

a b

c d

a, b, d: chert; c: sandstone

SEM images of HF etched quartz

a b

white arrow: "pillaring" texture; black arrow: "array" texture

PDF images

Optical image SEM-CL image

BSE imageSEM image

Raman spectral analysis

Micro-Raman spectra of shocked quartz from Mt. Oikeyama

Shocked　quartz　from　Mt.　Oikeyama

Optical image SEM-CL image

2D Raman mapping 3D Raman mapping

Bouguer anomaly map Impact crater structure

Concluding Remarks

・ CL method provide us a useful information on defect in the lattice and trace elements existed as a impurity, which are so difficult to characterize using any other conventional methods.

・ SEM-CL and micro-Raman spectroscopy enable to characterize crystallochemical properties of micro-size minerals in planetary science.

・ Further CL application can be expected to a new field in geosciences.