Data di Pubblicazione:
2000
Citazione:
Twin walls in anorthoclase are enriched in alkali and depleted in Ca and Al / F. Cámara, J.C. Doukhan, E.K.H. Salje. - In: PHASE TRANSITIONS. - ISSN 0141-1594. - 71:3(2000), pp. 227-242.
Abstract:
Composition profiles have been measured in transformation twin walls of the albite type in anorthoclase. Regions close to the walls between two twin domains are enriched in K and Na and depleted in Ca and Al. Microanalysis experiments show high mobility of alkali cations close to twin boundaries. Twin walls are generated via the displacive phase transition C2/m-C1̄ in Al, Si disordered feldspar, and the chemical heterogeneity is a fingerprint for the subsequent diffusion of alkali and earth alkali ions during the cooling history of the sample.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
anorthoclase; alkali feldspar; analytical transmission electron microscopy; compositional profiles; transformation twins
Elenco autori:
F. Cámara, J.C. Doukhan, E.K.H. Salje
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