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American Mineralogist; May 2007; v. 92; no. 5-6; p. 926-932; DOI: 10.2138/am.2007.2293
© 2007 Mineralogical Society of America
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Determination of layer stacking microstructures and intralayer transition of illite polytypes by high-resolution transmission electron microscopy (HRTEM)

Tao Chen and Hejing Wang*

Key Laboratory of Orogenic Belts and Crustal Evolution (Peking University), Ministry of Education of China, School of Earth and Space Sciences, Peking University, Beijing 100871, China

Correspondence: * E-mail: hjwang{at}pku.edu.cn

A detailed investigation of microstructures of authigenic illite has been carried out using high-resolution TEM. Near-atomic images of 1M and 2M1 polytypes of illite with incidence [100] and [110] were observed. We unambiguously determine 1M illite in both individual particles and microtwinned domains. Newly formed 2M1 domains are surrounded by former packets of 1Md or 1M illite. Such intergrowth of different illite-polytypic domains on a scale of several layers suggests that they are metastable. The lateral-coherent 1M and 2M1 illite domains are aligned along the same orientation and crystallographically continuous normal to [001]*. This is a new phenomenon observed for polytypic intergrowth and transition. The intralayer-stepwise change of stagger direction in a series of successive layers and consequently the interlayer-stacking angle change resulting in polytypic transition are hypothesized as an "intralayer-stepwise transition" model. It explains the process of illite polytypic transition in the solid state.

Key Words: Illite polytype • HRTEM • microstructure • intralayer-stepwise transition






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