Application of Paleomagnetism to Investigate Inclined Sheet/Conesheet Emplacement Mechanisms

尽管锥形岩席在玄武岩火山系统中具有明显的重要性，但人们对锥形岩席杂岩的了解仍然很少，它们的起源是几个相互竞争的假说的主题。我们将在两个研究区域应用古磁学技术来验证这些假设：苏格兰斯凯(苏格兰)一座主要的早第三纪玄武岩火山根部的Culin Hills；以及冰岛东南部被严重侵蚀的第四纪扩张脊Kalfafellsdalur。我们将利用NRM方位来确定席状侵入体的中心倾斜特征是否源于侵入后的倾斜。我们将利用磁化率各向异性来确定岩浆流动的方向，并利用古地磁来估计与岩片相邻的围岩中的温度梯度。

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.