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Further studies on the use of quartz grains from fault gouges to establish the age of faulting
Abstract Quartz grains were selected from samples of intrafauit material at two outcrop sites of the Atotsugawa fault in central Japan. Surface textures of the grains observed by scanning electron microscope were classified into texture groups I–IV, in the order from a simple feature through increasing undulations to a texture with cavities. The defects in the quartz measured by electron spin resonance gave absolute ages using the grains. The relative ages by surface texture groups were tentatively correlated to the absolute ages as determined by the electron spin resonance. It was disclosed that Subgroups Ia and Ib were stable during the period of 0.9 Ma, and changed through intermediate Subgroup Ic in a period ranging from 0.9 to 1.2 Ma, and then to Group II after 1.2 Ma. Therefore, the surface texture groups can change from Subgroups Ia and Ib through intermediate Subgroup Ic to Group II with increasing age. This indicates that the surface texture groups of quartz grains in the fault are effective for dating fault activity concisely.
Further studies on the use of quartz grains from fault gouges to establish the age of faulting
Abstract Quartz grains were selected from samples of intrafauit material at two outcrop sites of the Atotsugawa fault in central Japan. Surface textures of the grains observed by scanning electron microscope were classified into texture groups I–IV, in the order from a simple feature through increasing undulations to a texture with cavities. The defects in the quartz measured by electron spin resonance gave absolute ages using the grains. The relative ages by surface texture groups were tentatively correlated to the absolute ages as determined by the electron spin resonance. It was disclosed that Subgroups Ia and Ib were stable during the period of 0.9 Ma, and changed through intermediate Subgroup Ic in a period ranging from 0.9 to 1.2 Ma, and then to Group II after 1.2 Ma. Therefore, the surface texture groups can change from Subgroups Ia and Ib through intermediate Subgroup Ic to Group II with increasing age. This indicates that the surface texture groups of quartz grains in the fault are effective for dating fault activity concisely.
Further studies on the use of quartz grains from fault gouges to establish the age of faulting
Kanaori, Yuji (author) / Tanaka, Kazuhiro (author) / Miyakoshi, Katsuyoshi (author)
Engineering Geology ; 21 ; 175-194
1984-10-26
20 pages
Article (Journal)
Electronic Resource
English
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