Reed S.J.B. Electron microprobe analysis and scanning electron microscopy in geology

Plate 4.4. SE imag e of aragonite in modern sediment (300200 mm).

(By courtesy of J.A.D. Dickson.)

Plate 4.5. SE image of diatoms from modern lake sediment (6045 mm).

(By courtesy N. Cayzer and R. Thompson.)

Plate 4.7. SE image (7550 mm) of part of filter-feeding Cambrian arthropod.

(By courtesy of N.J.Butterfield.)

Plate 4.6. SE image of spicular radiolarian (scale bar – 50 (mm). (By courtesy

of E.W. Macdonald.)

Plate 4.8. SE image of sandstone showing quartz grains, with corroded feldspar

(bottom left). (By courtesy of S. Haszeldine.)

(a) (b)

Plate 4.9. Backscattered electron images of copper grid mounted on aluminium

stub: (a) compositional mode, using omnidirectional BSE signal (brightness

depends mainly on atomic number); (b) topographic mode, using difference

between BSE signals from opposite segments of detector (shows topographic

shadow effect, but no difference in mean brightness of copper and aluminium).

Plate 4.10. BSE image of mineral grains showing combined compositional

and topographic contrast (lighter grains – higher atomic number).

(a)

(b)

Plate 4.11. Stereoscopic image (400400 mm) of clinoptilite crystals (view

with red/green spectacles).

Plate 4.12. Foraminifera on cardboard mount, using low-vacuum SEM

(1.00.85 mm). (By courtesy of P.D. Taylor.)

Plate 4.13. BSE image (250200 mm) of Echinoid ossicle; light areas –

dolomite, dark areas – calcite. (By courtesy of J.A.D. Dickson.)

Plate 4.14. BSE image of spherule (1 mm diameter) in carbonate-rich lava,

showing Ba variations in zoned calcite.

Plate 4.15. BSE image of whole rock section (202 5 mm) comprised of

montage of individual smaller images. (By courtesy of J. Barreau.)

Plate 4.16. SE image of perthitic alkali feldspar (129 mm); specimen etched

in HF vapour; two stages of exsolution: (1) rounded oligoclase lamellae with

albite twinning, (2) narrow albite lamellae with etch pits showing presence of

dislocations between albite and K-feldspar host. (By courtesy of N. Cayzer)

(a) (b)

Plate 4.18. Image (a) with severe astigmatism, (b) with astigmatism corrected

by adjusting stigmator.

(a) (b)

Plate 4.17. Effect of stray mains-frequency electromagnetic field (a);

corrected by synchronising the line-scan rate (b).