Skip to Main Content
Skip Nav Destination
GEOREF RECORD

Three-component mixed-layer illite/smectite/kaolinite (I/S/K) minerals in hydromorphic soils, south China

Hong Hanlie, Cheng Feng, Yin Ke, Gordon Jock Churchman and Wang Chaowen
Three-component mixed-layer illite/smectite/kaolinite (I/S/K) minerals in hydromorphic soils, south China
American Mineralogist (September 2015) 100 (8-9): 1883-1891

Abstract

To understand clay mineral transformations in hydromorphic conditions in the red earth sediments in Xuancheng, south China, clay mineralogy was investigated using X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). The XRD results indicated that clay minerals in the hydromorphic soils were illite, kaolinite, smectite, vermiculite, and mixed-layer illite/smectite and illite/smectite/kaolinite. Changes of the kaolinitic reflections under the various conditions suggested that the kaolinitic phase is a mixed-layer structure having kaolinite layers randomly interstratified with illite and smectite layers. HRTEM observation showed that 10 Aa illite layers interstratified with both 15 Aa smectite layers and 7 Aa kaolinite layers in clay particles, confirming the occurrence of illite/smectite/kaolinite (I/S/K) three-component mixed-layer clays. The lattice fringes of the I/S/K clays appeared corrugated and vanishing, and also exhibited variable thickness along a lattice fringe, which were consistent with changes from illite to smectite, from smectite to kaolinite, and from illite to kaolinite, respectively. Hydromorphic conditions in the Xuancheng soils led simultaneously to the direct transformation of illite to kaolinite and the transformation of illite to smectite to kaolinite in the pedogenic processes, and the formation of I/S/K three-component mixed-layer clays as intermediate products of these processes.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 100
Serial Issue: 8-9
Title: Three-component mixed-layer illite/smectite/kaolinite (I/S/K) minerals in hydromorphic soils, south China
Affiliation: China University of Geosciences, Laboratory of Geobiology and Environmental Geology, Wuhan, China
Pages: 1883-1891
Published: 201509
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 51
Accession Number: 2015-089129
Categories: Sedimentary petrologySoils
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N29°30'00" - N34°34'60", E115°00'00" - E119°25'00"
Secondary Affiliation: University of Adelaide, AUS, Australia
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: 201538
Close Modal

or Create an Account

Close Modal
Close Modal