Journal
TECTONOPHYSICS
Volume 619, Issue -, Pages 36-43Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.tecto.2013.07.021
Keywords
Chelungpu fault; Gouge; Nano-particle; Clay; Quartz
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Funding
- National Science Council of Taiwan [NSC 95-2745-M-002-001, NSC 96-2627-M-002-011, NSC 97-2627-M-213-001]
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To determine the ultrafine nano-scale grains in a fault gouge; the Chelungpu fault gouge was sampled and analyzed. It was separated into different particle size ranges and was analyzed by synchrotron X-ray diffraction and transmission electron microscopy. The minerals of gouge are predominantly composed of quartz, plagioclase, smectite, illite, chlorite, and kaolinite. The mineral association of <100 nm particles are quartz, smectite, and illite. However, only smectite and illite are included except quartz in the 1-to-25 nm fractions. We propose that quartz is the index mineral associated with co-seismic fracture and the possible limit grain size is -25 nm on fracturing. The smectite and illite nano-particles may be associated with weathering process of gouge at shallow or surface conditions.(c) 2013 Elsevier B.V. All rights reserved.
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