Timing and Dynamics of the Initiation of Subduction: South Island, New Zealand

戈尔尼斯EAR-0003558这项合作研究将记录新西兰西南部菲奥德兰边缘新生的俯冲带的演化，目的是限制俯冲启动的动力学。使用有限元方法，调查人员将模拟垂直运动和重力的历史，以确定与该地区的隆升历史和现代结构最一致的动力学模型类别。研究人员的(U-Th)/He测年和新西兰合作者的暴露测年将限制与基岩抬升相关的侵蚀剥蚀。在第一年，该小组将获得以前收集的基岩样本的氦年龄。在南极洲的夏天(第二年)，他们将用租来的船在最南端的峡湾海岸采集新的样本，并用直升机在高海拔地区采集新的样本。这些样品的氦热计时年龄将被用来检验动力学模型。这是一个与新西兰同事R.Sutherland(IGNS)和P.Kamp(Waikato大学)合作的项目，他们得到了新西兰皇家学会的补充资金。

Gurnis EAR-0003558 This collaborative study will document the evolution of a nascent subduction zone along the Fiordland margin of southwest New Zealand with the objective of constraining the dynamics of subduction initiation. Using the finite element method, the investigators will model the history of vertical motion and gravity in order to determine the classes of dynamic models most consistent with the uplift history and modern structure of the region. (U-Th)/He dating by the investigators and exposure dating by New Zealand collaborators will place limits on erosional denudation associated with bedrock uplift. During year 1, the team will obtain helium ages for previously collected bedrock samples. During the Austral summer (year 2), they will collect new samples along the coast of the southernmost fiords with a chartered boat and at high elevations with a helicopter. Helium thermochronometric ages for these samples will be used to test the dynamic models. This is a collaborative project with NZ colleagues R. Sutherland (IGNS) and P. Kamp (Waikato University) who have complementary funding from the Royal Society of NZ.