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首页> 外文期刊>eEarth >Characteristics of chlorites in seismogenic fault zones: the Taiwan Chelungpu Fault Drilling Project (TCDP) core sample
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Characteristics of chlorites in seismogenic fault zones: the Taiwan Chelungpu Fault Drilling Project (TCDP) core sample

机译：发震断层带中的绿泥石特征：台湾切龙普断裂钻探项目（TCDP）岩心样本

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The iron content and the asymmetry of iron and magnesium ions in chlorites are examined for the Chelungpu Fault in Taiwan, which is a seismogenic fault. The samples are collected from the cores drilled for the Taiwan Chelungpu Fault Drilling Project (TCDP, borehole B). Three fault zones are recognized as candidates for the source of seismogenic materials. The fault zones are composed of fractured-damaged rocks, breccia, gray gouge, black gouge, and black material. Chlorite from each type of rock was analyzed by using X-ray diffraction (XRD). The iron content and asymmetry of the iron and magnesium ions in the chlorites were estimated from the XRD peak ratios. The hydroxide and silicate layers of chlorite in the black gouge and black material have low iron contents. Many studies have suggested that a temperature rise occurred at the fault zones. In addition, the temperature rise can result in the production of iron oxides such as magnetite or maghemite, as reported by other studies. However, the temperature rise cannot explain the low value of iron content in the chlorites. Another reason for the low value of iron content is the variation in the pH of the fluid, which can be controlled by radical reactions. Therefore, on the basis of chlorite characteristics, the reactions at the seismogenic fault are due not only to the thermal decomposition resulting from the temperature rise and but also to rock-fluid interactions.
机译：在台湾的震龙堡断裂中，对亚氯酸盐中的铁含量以及铁和镁离子的不对称性进行了研究，这是一个地震成因。样品是从为台湾志龙埔断层钻探项目（TCDP，钻孔B）钻取的岩心中收集的。三个断层带被认为是震源物质的候选者。断层带由断裂破碎的岩石，角砾岩，灰泥，黑泥和黑色物质组成。通过使用X射线衍射（XRD）分析来自每种岩石的亚氯酸盐。根据XRD峰比估算亚氯酸盐中的铁含量和铁和镁离子的不对称性。黑泥和黑色材料中亚氯酸盐的氢氧化物和硅酸盐层的铁含量低。许多研究表明，在断层带会出现温度升高。另外，如其他研究报道的那样，温度升高会导致生成氧化铁，例如磁铁矿或磁赤铁矿。然而，温度上升不能解释亚氯酸盐中铁含量的低值。铁含量低的另一个原因是流体pH值的变化，这可以通过自由基反应来控制。因此，根据亚氯酸盐的特性，在地震发生断层处的反应不仅是由于温度升高引起的热分解，而且是由于流体的相互作用。

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