The significance of primary volcanic fabrics and clay distribution in landslides in Hong Kong

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doi: 10.1144/gsjgs.154.6.1009
Authors:Kirk, P. A.; Campbell, S. D. G.; Fletcher, C. J. N.; Merriman, R. J.
Author Affiliations:Primary:
Hong Kong Geological Survey, Geotechnical Engineering Office, Kowloon, China
Other:
British Geological Survey, United Kingdom
Volume Title:geology of Hong Kong
Volume Authors:Fletcher, C. J. N., editor
Source:Journal of the Geological Society of London, Vol.154(Part 6), p.1009-1019; Geology of Hong Kong, Hong Kong, China, Jan. 22, 1997, edited by C. J. N. Fletcher. Publisher: Geological Society of London, London, United Kingdom. ISSN: 0016-7649
Publication Date:1997
Note:In English. 22 refs.; illus., incl. 1 table, sketch map
Summary:Two major Hong Kong landslides in 1995 highlight relationships between primary volcanic foliations and kaolin accumulations that have general significance in determining loci of large failures. In the first case, a bedding-parallel shear zone was the locus for kaolin concentration in a shallowly dipping tuff; this formed a weak, planar, low-permeability layer which acted as the surface of rupture of a translational failure. In the second case, steeply inclined fabrics and subparallel, closely spaced joints occurred within a zone of syn-volcanic folding and shearing; deep weathering developed along this zone, with kaolin concentrations mainly above the soil-rock interface. Kaolin distribution is largely associated with the weathering profile, and may have been both physically and chemically redistributed within it; halloysite is more abundant than kaolinite in most clay samples at and near both rupture zones, and may have developed from kaolinite in response to strain. [R.A.H.]
Subjects:Case studies; Clay minerals; Failures; Faults; Foliation; Halloysite; Igneous rocks; Kaolinite; Landslides; Lithofacies; Mapping; Mass movements; Mechanism; Rock mechanics; Shear zones; Sheet silicates; Silicates; Volcanic rocks; Weathering; X-ray diffraction data; Asia; China; Far East; Hong Kong
Coordinates:N221000 N222000 E1141500 E1140500
Abstract Numbers:98M/1894
Record ID:1998012762
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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