Host mineral phase determination related to elemental behavior during fluid

利用同步x射线辐射对台湾车隆堡断裂带沉积物岩心样品进行了微量元素的化学形态分析。锶几乎全部存在于钠长石相中，这是在250℃以上高温下流体-岩石相互作用过程中观察到的新结晶相。Sr的主相表明断层中存在水，其高温可以解释为断层同震摩擦加热的结果。这一结果将从矿物相和样带化学组成模式上支持断层弱化机制的热加压假说。

Chemical speciation analysis of trace elements was carried out for sediment core samples collected from Taiwan Chelungpu Fault using synchrotron X-ray radiation. Almost all Sr was present in the phase of albite, which is observed as a newly crystallized phase during the fluid-rock interaction at high temperatures of above 250 degrees Celsius in laboratory experiments. This host phase of Sr demonstrates the presence of water in the fault, and its high temperature can be interpreted as the result of co-seismic frictional heating of the fault. This result will support the hypothesis of thermal pressurization in fault weakening mechanism from mineral phase as well as transect chemical composition pattern.