Application of Paleomagnetism to Investigate Inclined Sheet/Conesheet Emplacement Mechanisms

尽管锥片在玄武岩火山系统中具有明显的重要性，但锥片复合体仍然知之甚少，它们的起源是几个相互竞争的假设的主题。我们将在两个研究区域应用古磁技术来检验这些假设：位于苏格兰斯凯岛（Skye）一个主要的早第三纪玄武岩火山根部的Cuillin山；Kalfafellsdalur是冰岛东南部一个深度侵蚀的第四纪扩张脊。我们将使用NRM方向来确定片状入侵的中心倾斜特征是否是由于入侵后倾斜造成的。我们将利用磁化率各向异性确定岩浆流动方向，并利用古地磁估计与薄片相邻的乡村岩石的热梯度。

Despite the evident importance of cone sheets in basalt volcanic systems, cone sheet complexes are still poorly understood and their origin is the subject of several competing hypotheses. We will apply paleo-magnetic techniques to test these hypotheses in two study areas: the Cuillin Hills of Skye (Scotland) in the roots of a major early-Tertiary basaltic volcano; and Kalfafellsdalur, a deeply eroded Quaternary spreading ridge in SE Iceland. We will use the NRM orientation to determine whether the centrally-inclined character of the sheet-intrusions is due to post-intrusion tilting. We will determine the magma-flow direction by magnetic susceptibility anisotropy, and we will estimate thermal gradients in country rock adjacent to sheets by paleomagnetism.