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Nanotunnels and pull-aparts: Defects of exsolution lamellae in alkali feldspars

Fitz Gerald, John; Parsons, I; Cayzer, N


We have studied defects associated with flat, lens-shaped perthitic albite lamellae in alkali feldspars using SEM and TEM. In orthoclase phenocrysts from the Shap granite, Cumbria, NW England, bulk composition Or70.20Ab29.05 An0.85, no dislocations were found even in optically "fresh" parts of grains. Instead, dissolution inferred to be localized on edge-dislocation loops has created tiny "nanotunnels" typically <10 nm in diameter. Some nanotunnels are facetted, confirming that they were...[Show more]

CollectionsANU Research Publications
Date published: 2006
Type: Journal article
Source: American Mineralogist
DOI: 10.2138/am.2006.2029


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