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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

基本信息

批准号：
16340156
负责人：
FUKUCHI Tatsuro
金额：
$ 5.44万
依托单位：
Yamaguchi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2004
资助国家：
日本
起止时间：
2004 至 2006
项目状态：
已结题

项目摘要

We have developed a 2-Dimensional electron spin resonance (ESR) imaging apparatus to nondestructively analyze heating events in fault rocks. The 2-D ESR imaging apparatus is composed of a slit cavity (slit width 3mmx10 mm), an external coil for 100kHz modulation field and an X-Y stage, in addition to an ordinary ESR spectrometer. To improve the resolution of 2-D ESR images, we remodeled the slit cavity and stuck a thin brass plate with a pinhole of Ф 2.6mm on the slit cavity. Consequently, the resolution is considerably improved from 2~3mm to 0.25mm. We have carried out 1-D continuous ESR measurement and 2-D ESR imaging of Nojima fault rocks using the 2-D ESR imaging apparatus. The target ESR signal for the 1-D and 2-D ESR measurements is a ferrimagnetic resonance (FMR) signal of iron oxides, which are generated and increased by heating. As a result, we have succeeded in detecting with precision of 0.25mm frictional heating events during ancient repeated earthquakes. The detection of f … More rictional heating events with such a high precision is the first in the world. Furthermore, we have studied a new method to estimate frictional heat temperature from 1-D ESR continuous data and developed an analytical computer program for it. In the next step, we plan to carry out 2-D ESR imaging of Taiwan Chelungpu Fault Drilling Project (TCDP) Hole B core samples and estimate frictional heat temperature in the 1999 ChiChi Earthquake, because this drilling project was delayed and consequently we could not measure 2-D ESR images of the core samples in the term of our scientific research project. On the other hand, we have considered how to convert a 2-D ESR image into a 2-D magnetic susceptibility map, and actually made 2-D magnetic susceptibility maps of natural rocks such as magnetite ore, serpentinite, gabbro, Nojima fault rocks and Chelungpu fault rocks by comparison with a standard Nickel sample (54.56 emu/g). In addition, we carried out basic studies on FMR signals of iron oxides and vitrinite reflectances of brown coal and mudstone, applied these indicators for frictional heating to Nojima fault and Chelungpu fault drill core samples, and estimated frictional heat temperatures in the 1995 Kobe and 1999 ChiChi Earthquakes, respectively. Less

我们研制了一种二维电子自旋共振（ESR）成像装置，用于断层岩加热事件的非破坏性分析。二维ESR成像装置除普通ESR谱仪外，还包括狭缝腔（狭缝宽3 mm × 10 mm）、100 kHz调制场外线圈和X-Y工作台。为了提高二维ESR图像的分辨率，我们对狭缝腔进行了改造，并在狭缝腔上粘贴了一个直径为2.6mm的小孔。因此，分辨率从2~ 3 mm显著提高到0.25mm。利用二维ESR成像仪对野岛断层岩进行了一维连续ESR测量和二维ESR成像。用于1-D和2-D ESR测量的目标ESR信号是铁氧化物的亚铁磁共振（FMR）信号，其通过加热产生并增加。结果，我们成功地探测到了0.25毫米的古重复地震摩擦加热事件。f的检测 ...更多信息如此高精度的摩擦加热事件在世界上尚属首次。在此基础上，我们研究了一种利用一维ESR连续数据估算摩擦热温度的新方法，并编制了相应的计算机分析程序，下一步，我们计划对台湾车笼埔断层钻探计划（TCDP）B孔岩心样品进行二维ESR成像，并估算1999年集集地震的摩擦热温度。由于该钻探项目延期，在科研项目期间无法对岩心样品进行二维ESR图像测量。另一方面，我们考虑了如何将二维ESR图像转换为二维磁化率图，并实际制作了磁铁矿、蛇纹岩、辉长岩、野岛断层岩和车笼埔断层岩等天然岩石的二维磁化率图，并与标准镍样品（54.56 emu/g）进行了对比。此外，我们还对褐煤和泥岩的铁氧化物和镜质组反射率的FMR信号进行了基础研究，并将这些摩擦热指标应用于野岛断层和车笼埔断层钻孔岩芯样品，分别估算了1995年科比地震和1999年集集地震的摩擦热温度。少