Host mineral phase determination related to elemental behavior during fluid

利用同步辐射X射线对台湾车伦堡断裂沉积物岩心样品进行了微量元素化学形态分析。钠长石是实验室实验中在250℃以上高温下流体-岩石相互作用过程中观察到的一种新结晶相，几乎所有的锶都存在于钠长石相中。这种主相表明断裂中存在水，其高温可解释为断裂的同震摩擦加热的结果。这一结果从矿物相和断面化学成分模式两个方面支持了断层弱化机制中的热增压假说。

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.