A Field-based Test of Remagnetization Hypothesis for the Ecstall Pluton, Coast Mountains Batholith, British Columbia

这项研究的重点是澄清起源和磁化记录在一个花岗岩体（Ecstall岩体）内的海岸山脉的不列颠哥伦比亚省的时间。迄今为止的研究表明，这个岩体可能是通过一个直到最近才被认识到的过程而被磁化的，这个过程是在特定的铁-钛氧化物的分解过程中产生的。这种分解过程需要缓慢冷却或在岩浆最初侵入后重新加热。埃克斯塔尔岩体的磁性在地理上有很大的差异，可能是由于热剪切带导致的再加热。这项研究更重要的是，磁性变化的起源将澄清一个悬而未决的问题，即北美西部大陆地壳的大部分是否是从数千公里外的大陆上增生的，正如从该地区的岩石单元和其他岩石单元的磁性所推断的那样。该研究需要实地考察，地质年代学，岩石磁学和古磁学，矿物学研究，包括电子显微镜和其他材料科学技术。

This research is focused on clarifying the origin and timing of magnetization recorded in a granitoid body (the Ecstall Pluton) within the Coast Mountains of British Columbia. Research to date has revealed that this pluton was likely magnetized by a process only recently recognized, which arises during unmixing of specific iron-titanium oxides. The unmixing process requires either slow cooling or reheating following the initial intrusion of the magma. The magnetism of the Ecstall pluton varies geographically in such a way that reheating due to a hot shear zone appears likely. The larger importance of this research is that the origin of the variation in magnetism will clarify the outstanding question of whether large portions of the western North American continental crust were accreted to the continent from thousand of kilometers away, as has been inferred from magnetism of this and other rock units in the region. The research entails fieldwork, geochronology, rock magnetism and paleomagnetism, and mineralogical studies including electron microscopy and other materials science techniques.