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Changes to magnetic minerals caused by frictional heating during the 1999 Taiwan Chi-Chi earthquake

机译：1999年台湾集集地震期间摩擦加热引起的磁性矿物变化

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We carried out magnetic mineral analyses of samples from the shallowest major fault zone within the Chelungpu fault system, which is the zone that previous researchers believe slipped during the 1999 Taiwan Chi-Chi earthquake. Our aim was to gain an understanding of the changes to magnetic minerals during the earthquake. Magnetic hysteresis and low-temperature thermal demagnetization measurements showed that high magnetic susceptibilities in the black gouge zone within the major fault zone could be attributed not to fining of ferrimagnetic minerals but, rather, to their abundance. Thermomagnetic analyses indicated that the strata in and around the fault zone originally contained thermally unstable iron-bearing paramagnetic minerals, such as pyrite, siderite, and chlorite. We therefore concluded that frictional heating (>400°C) occurred in the black gouge zone in the major fault zone during the slip of the Chi-Chi earthquake and that the resultant high temperature induced thermal decomposition of paramagnetic minerals to form magnetite, resulting in the observed high magnetic susceptibilities.
机译：我们对切龙埔断裂系统中最浅的主要断裂带的样品进行了磁性矿物分析，该断裂带是以前的研究人员认为在1999年台湾集集地震中滑落的区域。我们的目的是了解地震期间磁性矿物的变化。磁滞和低温热退磁测量结果表明，主要断层带内黑泥区的高磁化率可能不归因于亚铁磁性矿物的细化，而是归因于它们的丰度。热磁分析表明，断层带及其周围的地层最初包含热不稳定的含铁顺磁性矿物，例如黄铁矿，菱铁矿和绿泥石。因此，我们得出的结论是，在集集地震发生的滑动过程中，主要断层带的黑色断层带发生了摩擦加热（> 400°C），并且高温导致顺磁矿物热分解形成磁铁矿，导致观察到的高磁化率。

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