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Outline<br />

• The critical zone: models for feldspar weathering<br />

• Materials<br />

• Focused Ion Beam (FIB) technique<br />

• Results<br />

• Integration with XPS<br />

Aim<br />

• FIB-TEM investigation of mineral weathering:<br />

– Grain surface topography; structure; composition;<br />

reaction products<br />

– How do feldspars weather in natural systems?

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