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White mica domain formation: A model for paragonite, margarite, and muscovite formation during prograde metamorphism
-
Kenneth J.T. Livi
,
George E. Christidis
Published/Copyright:
April 1, 2015
Abstract
Scanning transmission electron microscopy images of the 00l white mica planes in crystals from central Switzerland and Crete, Greece, reveal that domains of paragonite, margarite, and muscovite are ordered within the basal plane. Energy dispersive X-ray analyses show that both cations in the interlayer and in the 2:1 layer have ordered on the scale of tens to hundreds of nanometers. Domain boundaries can be both sharp and crystallographically controlled or diffuse and irregular. A model outlining the domain formation process is presented that is consistent with X-ray powder diffraction and transmission electron microscopy data. The domain model incorporates aspects of a mixedlayered and a disordered compositionally intermediate phase models. The main feature of the model is the formation of mica species that segregate within the basal plane and contradict the notion of homogeneous layers within mixed-layer phases. Implications for the formation of all diagenetic and very low-grade metamorphic 2:1 sheet silicates are discussed
Received: 2007-4-3
Accepted: 2007-11-16
Published Online: 2015-4-1
Published in Print: 2008-4-1
© 2015 by Walter de Gruyter Berlin/Boston
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Keywords for this article
Muscovite;
paragonite;
margarite;
TEM;
STEM;
low-grade metamorphism;
white mica formation
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