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Titolo:
Examination of mineral assemblage and chemical composition in the fracturezone of the Nojima Fault at a depth of 1140 m: Analyses of the HirabayashiNIED drill cores
Autore:
Matsuda, T; Arai, T; Ikeda, R; Omura, K; Kobayashi, K; Sano, H; Sawaguchi, T; Tanaka, H; Tomita, T; Tomida, N; Hirano, S; Yamazaki, A;
Indirizzi:
Natl Res Inst Earth Sci & Disaster Prevent, Tsukuba, Ibaraki 3050006, Japan Natl Res Inst Earth Sci & Disaster Prevent Tsukuba Ibaraki Japan 3050006 Shinshu Univ, Grad Sch Sci & Technol, Matsumoto, Nagano 3908621, Japan Shinshu Univ Matsumoto Nagano Japan 3908621 sumoto, Nagano 3908621, Japan Niigata Univ, Grad Sch Sci & Technol, Niigata 9502181, Japan Niigata UnivNiigata Japan 9502181 Sci & Technol, Niigata 9502181, Japan Univ Tokyo, Grad Sch Sci, Tokyo 1130032, Japan Univ Tokyo Tokyo Japan 1130032 Tokyo, Grad Sch Sci, Tokyo 1130032, Japan Waseda Univ, Sch Educ, Dept Earth Sci, Tokyo 1698050, Japan Waseda Univ Tokyo Japan 1698050 uc, Dept Earth Sci, Tokyo 1698050, Japan Ehime Univ, Fac Sci, Dept Geobiospher Sci, Matsuyama, Ehime 7908577, JapanEhime Univ Matsuyama Ehime Japan 7908577 Matsuyama, Ehime 7908577, Japan Univ Tsukuba, Grad Sch Sci & Engn, Tsukuba, Ibaraki 3050006, Japan Univ Tsukuba Tsukuba Ibaraki Japan 3050006 sukuba, Ibaraki 3050006, Japan Japan Marine Sci & Technol, Frontier Res Program Subduct Dynam, Yokosuka, Kanagawa 2370061, Japan Japan Marine Sci & Technol Yokosuka Kanagawa Japan2370061 2370061, Japan
Titolo Testata:
ISLAND ARC
fascicolo: 3-4, volume: 10, anno: 2001,
pagine: 422 - 429
SICI:
1038-4871(200109/12)10:3-4<422:EOMAAC>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
VOLUME-LOSS; FLUID; MYLONITIZATION; USA;
Keywords:
alternation; drilling; fault zone; Hyogo-ken Nanbu earthquake; Kobe earthquake; Nojima Fault;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
12
Recensione:
Indirizzi per estratti:
Indirizzo: Matsuda, T Natl Res Inst Earth Sci & Disaster Prevent, Tennodai 3-1, Tsukuba, Ibaraki3050006, Japan Natl Res Inst Earth Sci & Disaster Prevent Tennodai 3-1 Tsukuba Ibaraki Japan 3050006
Citazione:
T. Matsuda et al., "Examination of mineral assemblage and chemical composition in the fracturezone of the Nojima Fault at a depth of 1140 m: Analyses of the HirabayashiNIED drill cores", ISL ARC, 10(3-4), 2001, pp. 422-429

Abstract

A 1800 m deep borehole was drilled at Nojima Hirabayashi, Japan to penetrate through the Nojima Fault, which was activated at the time of the 1995 Hyogo-ken Nanbu earthquake (Kobe earthquake). Three fracture zones were recognized in cores at approximate depths of 1140 m, 1300 m and 1800 m. The modeof distribution of fault rocks, minerals and chemical elements were analyzed in an interval between depths of 1108 m and 1161 m, focusing on the fracture zone at the depth of 1140 m. Foliated blue-gray fault gouge constituted the central part of the fracture zone. The degree of fracturing appeared to be greater in the hanging wall than in the footwall. The relative amounts of minerals were estimated qualitatively. In the analyzed interval, not only were quartz, orthoclase, plagioclase, biotite and hornblende detected in the parent rock (granodiorite), but also kaolinite, smectite, laumontite,stilbite, calcite, ankerite and siderite, which are related to hydrothermal alteration. In particular, biotite disappeared both in the hanging wall and footwall across the central fault zone; it disappeared over a wider range in the hanging wall than in the footwall. The amounts of major chemical elements were analyzed quantitatively. Concentrations of Al2O3, Fe2O3, MnO, TiO2, and P2O5 all decreased throughout the interval except at some points. H2O+ and CO2 increased throughout the interval. Na2O increased in the region outside the central plane, whereas MgO and CaO increased in the hanging wall and decreased in the footwall. SiO2 and K2O decreased in the hanging wall and increased in the footwall. These results elucidate the higher degree of fracturing and chemical changes present in the hanging wall of the 1140 m fracture zone than in the footwall.

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Documento generato il 08/08/20 alle ore 08:59:28