Deep Structure of a Hotspot Influenced Rifted Volcanic Margin: A Joint U.S.- Danish Seismic Experiment off SE Greenland

美国和丹麦对格陵兰岛东南部边缘的联合研究，以更好地了解火山裂谷大陆边缘，其中包含在大陆分裂期间放置的厚层基性火成岩物质。这里是研究火山裂谷边缘的理想场所，因为这里有一个已知的热点和明确的热点轨迹，相对简单的构造和地质历史，以及薄的裂谷后沉积物覆盖。最近的ODP钻井和大量现有的现场研究提供了额外的背景数据。计划开展多通道广角地震研究，目的是确定地幔柱对裂谷边缘岩浆活动的影响，大陆-海洋过渡的详细结构，并比较共轭火山边缘段的地壳结构。这些数据将为解释边缘的地质和钻探结果以及约束火山裂谷边缘演化的热力学模型提供一个框架。

9416631 Holbrook A joint US-Danish study of the Southeast Greenland margin to provide a better understanding of the volcanic rifted continental margins which contain great thicknesses of mafic igneous material emplaced during continental breakup. This is an ideal setting to study volcanic rifted margins, because of a known hotspot and well defined hot spot track, a relatively simple tectonic and geologic history and a thin postrift sediment cover. Recent ODP drilling and numerous existing field studies provide additional background data. A multichannel and wide-angle seismic study in planned with the objectives to determine the influence of a mantle plume on the rifted margin magmatism, the detailed structure of the continent- ocean transition, and to compare the crustal structure of conjugate volcanic margin segments. The data will provide a framework for interpreting geological and drilling results on the margin and for constraining thermomechanical models of volcanic rifted margin evolution.