Skip to Main Content
GEOREF RECORD

Determination of layer stacking microstructures and intralayer transition of illite polytypes by high-resolution transmission electron microscopy (HRTEM)

Chen Tao and Wang Hejing
Determination of layer stacking microstructures and intralayer transition of illite polytypes by high-resolution transmission electron microscopy (HRTEM)
American Mineralogist (May 2007) 92 (5-6): 926-932

Abstract

A detailed investigation of microstructures of authigenic illite has been carried out using high-resolution TEM. Near-atomic images of 1M and 2M (sub 1) polytypes of illite with incidence [100] and [110] were observed. We unambiguously determine 1M illite in both individual particles and microtwinned domains. Newly formed 2M (sub 1) domains are surrounded by former packets of 1M (sub d) 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 2M (sub 1) illite domains are aligned along the same orientation and crystallographically continuous normal to [001] (super *) . 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.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 92
Serial Issue: 5-6
Title: Determination of layer stacking microstructures and intralayer transition of illite polytypes by high-resolution transmission electron microscopy (HRTEM)
Author(s): Chen TaoWang Hejing
Affiliation: Peking University, School of Earth and Space Sciences, Beijing, China
Pages: 926-932
Published: 200705
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 37
Accession Number: 2007-065446
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200733
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal