Abstract
Abstract Bøggild intergrowth of an intermediate plagioclase from Ylämma, Finland was investigated by high resolution transmission electron microscopy. A quantitative chemical analysis was carried out on the exsolution lamellae by means of an energy dispersive analyzer. The chemical compositions of the two alternating phases were determined by point analysis to Ab38.7An60.1Or1.2 and Ab51.0An46.8Or2.2 for the thicker and the thinner lamellae, respectively. The bulk chemical composition Ab42.0An56.5Or1.5 calculated from the thickness of lamellae was consistent with that determined by X-ray microprobe analysis except for Or contents. Continuous resolution of lattice fringes across exsolution lamellae shows matching of lattices, which is consistent with the compositional difference in the exsolution lamellae.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
