MACQUARIE ISLAND: A UNIQUE WINDOW INTO THE OCEAN BASEMENT AND THE LINK BETWEEN OCEAN RIDGES AND OPHIOLITES

麦夸里岛：一扇独特的窗户，可以看到洋底和洋脊和蛇绿岩之间的联系。由于无法进入深海海底，有关洋壳的组成和结构的知识有限。麦夸里岛是世界上唯一露出海平面以上的洋壳和地幔碎片，为原位研究洋底形成过程提供了独特的机会。我们的项目将对岛上的下地壳和地幔剖面进行详细的测绘，然后对样品进行综合的显微构造、岩石学和地质年代学分析。这样的研究可能导致对大洋中脊扩张中心洋壳的形成、变形和侵位的理解取得根本性进展。

MACQUARIE ISLAND: A UNIQUE WINDOW INTO THE OCEAN BASEMENT AND THE LINK BETWEEN OCEAN RIDGES AND OPHIOLITES. Knowledge about the composition and structure of the oceanic crust is limited due to the inaccessibility of the deep-ocean floor. Macquarie Island is the only fragment of ocean crust and mantle exposed above sea-level in the world, providing a unique opportunity to study processes of oceanic floor generation in-situ. Our project will carry out detailed mapping of the lower crust and mantle sections on the island, followed by an integrated microstructural, petrological, and geochronological analysis of samples. Such investigations may lead to fundamental advances in the understanding of formation, deformation, and emplacement of oceanic crust at mid-ocean ridge spreading centres.