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XPS on Shap feldspars • 15°, 45°and 90°= 2.5, 6 and 9 nm • Si enriched, K and Na depleted ~1-2 nm • Surface chemistry modified without destroying feldspar framework (leaching of alkalis) • Layer is present (1-2 nm) but difficult to resolve on TEM. XPS data represents “dilution of result” with depth
TEM layers: a cautionary tale • Previous TEM layers (tens of nm thick): – Probable beam damage! Amorphous Au & Pt Au & Pt 50 nm 50 nm
Page 1 and 2: Nanoscale characterization of the
Page 3 and 4: Models for feldspar weathering
Page 5 and 6: Models are difficult to test: • R
Page 7 and 8: Materials • Naturally weathered a
Page 9 and 10: Beam Damage • Sample can be damag
Page 11 and 12: • Can Au coating (by sputtering)
Page 13 and 14: Shap alkali feldspars: microtopogra
Page 15 and 16: Shap alkali feldspars: etch pit net
Page 17 and 18: Shap alkali feldspars: microstructu
Page 19 and 20: Glen Feshie feldspars: weathering p
Page 21 and 22: Glen Feshie (1.1 kyr): reconstructi
Page 23: Conclusions • Shap weathers by st

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