The fault dating method and the assessment of fault activity using fault clay

断层测年方法及断层活动性断层粘土评估

基本信息

  • 批准号:
    08640574
  • 负责人:
  • 金额:
    $ 1.54万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
  • 财政年份:
    1996
  • 资助国家:
    日本
  • 起止时间:
    1996 至 1997
  • 项目状态:
    已结题

项目摘要

In this scientific research, we have developed the ESR isochron dating method using intrinsic ESR signals of clay minerals in fault clay for the purpose of the assessment of fault activity. This new dating method is based on the fact that the concentrations of ^<238>U and ^<22>Th adhered around clay grains change with grain size, and the isochron age of fault clay is obtained by simultaneously using multiple clay grains with the same age and different sizes. When we actually apply this isochron method to fault clay in a natural fault zone, we must discuss the problem of whether the state of radioactive equilibrium in the fault zone is satisfied. In this research, we can have judged a closed system of radioactive elements in the fault zone by cheking the ratio of ^<238>U and ^<232>Th using ICP-MS.Next, we tackled the radon anomaly phenomenon as an earthquake precuosor which is directly concerned with the problem of radioactive equilibrium in the fault zone. The fault clay sample collect … More ed from the outcrop of the Nojima Fault at Nojima-Hirabayashi, where strong gamma-rays intensity of ^<214>Bi was detected by a survey soon after the 1995 earthquake, was chemically analyzed by atomic absorption spectrophotometry and ICP-MS.Consequently, it has been found from the concentrations of ^<238>U,^<232>Th and ^<208>Pb and their ratios that the radon anomaly along the Nojima Fault may be ascribed to the adherence of radioactive elements and the release of radon with progressive clay mineralization in the fault zone.On the other hand, we analyzed the Nojima Fault 500m drilling core sample by ICP-MS and detected ^<208>Pb anomaly from the fault clay in the immediate vicinity of the fault surface which may have moved in the 1995 earthquake. This ^<208>Pb anomaly may be derived from ^<220>Rn gases generated in large quantities at deep positions of the Earth's crust. Furthermore, parts of major and minor elements such as Fe_2O_3, Al_2O_3, k_<133>Cs and ^<138>Cs in the fault clay (0-3mm in width) just on the fault surface showed extreme variations. ESR analysis made it clear that the fault clay just on the fault surface had been subjected to heating. These results may be explained by supposing that a hot fluid with specific elements flowed out of a deeper position of the Nojima Fault. In the 1997 June 25 Northern Yamaguchi Prefecture Earthquake, high gamma-rays intensity of ^<214>Bi was detected over the lineament along the earthquake source fault. We conclude that the radon anomaly in earthquakes may be concerned with fault clay mineralization. Less
在这项科学研究中,我们开发了利用断层粘土中粘土矿物的固有ESR信号的ESR等时线测年方法,以评估断层活动性。这种新的测年方法是基于黏土颗粒周围附着的^<238>U和^<22>Th的浓度随颗粒尺寸的变化而变化,同时使用多个相同年龄、不同尺寸的粘土颗粒来获得断层粘土的等时年龄。当我们实际将这种等时线方法应用于天然断裂带的断层粘土时,必须讨论断裂带内是否满足放射性平衡状态的问题。本研究通过ICP-MS检测^<238>U和^<232>Th的比值,可以判断断层带中放射性元素的封闭系统。接下来,我们将氡气异常现象作为地震前兆来解决,它与断层带中的放射性平衡问题直接相关。 1995年地震后不久,在野岛平林的野岛断层露头处采集了断层粘土样品,该断层粘土样品在一次调查中检测到了^<214>Bi的强伽马射线强度,并通过原子吸收分光光度法和ICP-MS进行了化学分析。因此,从^<238>U、^<232>Th和^<238>U、^<232>Th和 ^<208>Pb及其比值表明,野岛断层沿线的氡气异常可能是由于断层带中放射性元素的附着和随着粘土矿化的进行而氡的释放造成的。另一方面,我们通过ICP-MS分析了野岛断层500m钻孔岩心样本,并在紧邻断层表面的断层粘土中检测到了^<208>Pb异常,这可能是由于 1995年地震时已搬迁。这种^<208>Pb异常可能源于地壳深处大量产生的^<220>Rn气体。此外,断层面断层粘土(宽0~3mm)中部分Fe_2O_3、Al_2O_3、k_<133>Cs、^<138>Cs等主量元素和微量元素也表现出极大的变化。 ESR分析表明,断层表面的断层粘土受到了加热。这些结果可以通过假设含有特定元素的热流体从野岛断层的更深位置流出来解释。在1997年6月25日山口县北部地震中,在沿震源断层的线状结构上检测到了^<214>Bi的高伽马射线强度。我们的结论是,地震中的氡气异常可能与断层粘土矿化有关。较少的

项目成果

期刊论文数量(25)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Fukuchi, T.and Imai, N.: "ICP-MS and ESR dating of the 500m Nojima drilling core sample" Chikyu Monthly, Special Issue. 21 (in press). (1988)
Fukuchi, T. 和 Imai, N.:“500m Nojima 钻探岩心样本的 ICP-MS 和 ESR 测年”地球月刊,特刊。
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    0
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Fukuchi,T.: "Diret ESR dating of fault gouge using clay minerals and the assessment of fault activity" Engineering Geology. 43. 201-211 (1996)
Fukuchi,T.:“使用粘土矿物对断层泥进行直接 ESR 测年和断层活动评估”工程地质学。
  • DOI:
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    0
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  • 通讯作者:
Fukuchi, T.: "Direct ESR dating of fault gouge using clay minerals and the assessment of fault activity" Engineering Geology. 43. 201-211 (1996)
Fukuchi, T.:“使用粘土矿物对断层泥进行直接 ESR 测年和断层活动评估”工程地质学。
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Fukuchi, T.: "A mechanism of the formation of E'and peroxy centers in natural deformed quartz" Applied Radiation and Isotopes. 47. 1509-1521 (1996)
Fukuchi, T.:“天然变形石英中 E 和过氧中心的形成机制”应用辐射和同位素。
  • DOI:
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    0
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  • 通讯作者:
Fukuchi, T.: "A mechanism of the formation of E' and peroxy centers in natural deformed quartz" Applied Radiation and Isotopes. 47. 1509-1521 (1996)
Fukuchi, T.:“天然变形石英中 E 和过氧中心的形成机制”应用辐射和同位素。
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FUKUCHI Tatsuro其他文献

FUKUCHI Tatsuro的其他文献

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{{ truncateString('FUKUCHI Tatsuro', 18)}}的其他基金

ESR analytical method for simultaneously estimating the age and magnitude of paleoearthquakes from fault rocks
断层岩同时估算古地震年代和震级的ESR分析方法
  • 批准号:
    25560175
  • 财政年份:
    2013
  • 资助金额:
    $ 1.54万
  • 项目类别:
    Grant-in-Aid for Challenging Exploratory Research
Scanning ESR microscopy for nondestructive analyses of drill cores
用于钻芯无损分析的扫描 ESR 显微镜
  • 批准号:
    20340139
  • 财政年份:
    2008
  • 资助金额:
    $ 1.54万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Development of 2-Dimensional ESR thermal imaging apparatus and its application to drill core samples collected from a subduction seismogenic zone
二维ESR热成像仪的研制及其在俯冲地震带钻取岩心样品中的应用
  • 批准号:
    16340156
  • 财政年份:
    2004
  • 资助金额:
    $ 1.54万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
ESR & OSL analyses of seismic frictional heating events recorded in fault gouge and their application to deep drill core samples
血沉
  • 批准号:
    13640462
  • 财政年份:
    2001
  • 资助金额:
    $ 1.54万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
ESR/ICP-MS dating method of the latest fault movement
最新断层运动的ESR/ICP-MS测年方法
  • 批准号:
    10640441
  • 财政年份:
    1998
  • 资助金额:
    $ 1.54万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)

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地质条件和长期过程导致活动断层终止处附近发生大规模山体滑坡
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应力传递和粘性流控制的活动断层滑移率和地震复发
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阐明低活动性活动断层,以 2016 年熊本地震相关的小表面破裂为目标
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