Testing the core-mantle boundary & large igneous province hypothesis: a full-vector palaemagnetic study of the North Atlantic Igneous Province

背景：大型火成岩省(LIP)是数百万年来喷发的火山活动的大片区域，导致环境迅速变化和大规模灭绝，例如二叠纪-三叠纪的大规模灭绝。有人认为，嘴唇是地核能量释放的延迟表现；来自核-地幔边界(CMB)的热羽流在约50Myr的时间内上升，形成热点。当热点第一次突破地壳时，就形成了ALIP。在CMB释放能量之前，地核很可能比平时更热。据预测，温度的升高将增加外核中的流体流动速度，提高地球发电机的效率，导致比平时更高的地磁场强度(Biggin等人，2012年)。然而，这些想法并没有经过严格的检验。美国西北部的哥伦比亚河玄武岩是一个发生在17-14 Ma的“小”唇，与黄石热点有关，北大西洋火成岩省(NAIP)是一个以冰岛热点为中心喷发-54 Ma的唇。NAIP在大西洋形成期间分裂，现在从格陵兰岛东部、法罗群岛、北爱尔兰和苏格兰延伸。如果Biggin等人的假设。如果(2012)是正确的，那么，由于形成黄石热点的羽流的初步形成，奈普嘴唇基底记录到的强度应该很低。然而，从NaIP岩石中恢复的现代古代绝对地磁场强度的估计非常有限。有一些较旧的估计，特别是来自苏格兰的估计，然而，这些不再符合现代质量标准。项目：该项目有两个主要目标：1)测试Biggineal的CMB和LIP假说。(2012)，通过从法罗岛和不列颠群岛西海岸收集样本；2)确定NAIP的挤压速率，并帮助了解其与古新世-始新世最高温度和气候变化的潜在联系(Jones等人，2019年)。

Background: Large Igneous Provinces (LIPs) are large areas of volcanism that erupt over millions of years causing rapid environmental change and mass extinctions, e.g., the PermianTriassic mass extinction. It has been suggested that LIPs are delayed expressions of energy release from the Earth's Core; hot plumes from the Core-Mantle Boundary (CMB) rise over a period of ~50 Myr to form hotspots. When a hotspot first breaks through the Earth's crust aLIP forms. Before the energy release at the CMB, it is very likely that the Earth's Core was hotter than usual. It is predicted that increases in temperature, will increase fluid-flow rates in the outer Core, increasing the efficiency of the geodynamo, leading to higher geomagnetic field intensities than usual (Biggin, et al., 2012). However, these ideas have not been rigorously tested. The Columbia River Basalts, north west USA, is a 'small' LIP that occurred~17-14 Ma and is associated with the Yellowstone hotspot, and the North Atlantic Igneous Province (NAIP) is a LIP that erupted ~64 to 54 Ma centred on the Icelandic hotspot. The NAIP was broken up during the formation of the Atlantic Ocean and now extends from eastern Greenland, the Faroe Islands, Northern Ireland and Scotland. If the hypothesis of Biggin et al. (2012) is correct, then there should be a low in the intensity recorded by the NAIP LIP basaltsdue to the initial formation of the plume that forms the Yellowstone hotspot. However, modern ancient absolute geomagnetic field intensity estimates recovered from NAIP rocks are very limited. There are older estimates, especially from Scotland, however, these no longer meet modern quality criteria.Project: There are two main aims of the project: 1) Test the CMB & LIP hypothesis of Bigginet al. (2012), by collecting samples from both the Faroe Isles and the western coast of theBritish Isles; 2) Determine extrusion rates of the NAIP, and to help understand its potential linkto the Paleocene-Eocene Thermal Maximum and climate change (Jones et al., 2019).