Identification and tectonic implications of nano-particle quartz (< 50 nm) by synchrotron X-ray diffraction in the Chelungpu fault gouge, Taiwan

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• 作者：Yu-Min Chou^a ; ^b ; Sheng-Rong Song^a ; ^{srsong@ntu.edu.tw" class="auth_mail} ; Tsung-Ming Tsao^c ; Chao-Sung Lin^d ; Min-Kung Wang^e ; Jey-Jau Lee^f ; Fu-Je Chen^d
• 关键词：Chelungpu fault ; Gouge ; Nano-particle ; Clay ; Quartz
• 刊名：Tectonophysics
• 出版年：21 April, 2014
• 年：2014
• 卷：619-620
• 期：Complete
• 页码：36-43
• 全文大小：2337 K

文摘

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.