Origin, Deformation and Composition of Mesozoic Oceanic Crust Entering the Tonga-Kermadec Trench

这项拟议的工作将检验有关海洋岩石圈进入俯冲带时如何变形以及其组成如何影响邻近火山弧的岩浆活动的想法。调查员将进行磁力和多波束测深，并从汤加-克尔马德克海沟外隆起挖出岩石样品，分别进行地貌和地球化学分析。这将使他们能够采样由断裂产生的旧洋壳的年轻暴露，研究由断裂产生的旧洋壳的年轻暴露样本，并研究中生代形变。将在SeaBeam 2000上绘制一条2000公里长、80公里宽的带状地形图，并将收集约20-30个挖泥船样本。

The proposed work will test the ideas about how oceanic lithosphere deforms as it enters the subduction zone and how its composition affects the magmatism of the adjacent volcanic arc. The investigators will undertake a magnetic and multibeam bathymetric survey and dredge rock samples from the outer bulge of Tonga-Kermadec Trench for geomorphological and geochemical analyses, respectively. This will allow them to sample young exposures of old oceanic crust rpoduced by faulting and study the sample young exposures of old oceanic crust produced by faulting and study the Mesozoic deformation. A 2000-km long and 80 km wide strip will be mapped by Seabeam 2000 and ca 20-30 dredge samples will be collected.