MARGINS: Laboratory Experiments on 3-D Circulation and Temperature Distribution in Subduction Zones

近年来，地震和地球化学对俯冲和参与俯冲的地幔流的认识取得了进展，这促使了我们对俯冲进行实验室研究。PI提议进行实验室实验，类似于他对脊和羽流所做的实验，以研究俯冲过程。将有四种类型的模拟实验室实验：1)旨在了解纵向俯冲与回滚（板块下沉）的研究，2)研究回滚式俯冲对弧后盆地扩张和板块运动的作用的实验，3)研究振荡纵向和回滚俯冲对板块和楔块热结构的影响的实验，以及4)这种振荡对楔块区域地幔底辟形成的影响。所有这些实验都与边际程序中正在研究的过程有关。部分工作将在澳大利亚国立大学（ANU）与罗斯·格里菲斯（Ross Griffiths）一起完成，金凯德将在那里休一年的假。这将充分利用澳大利亚国立大学优秀的实验室设施。

This laboratory study of subduction is motivated by recent seismic and geochemical advances on understanding of subduction and mantle flow attending subduction. The PI proposes laboratory experiments similar to those he has done for ridges and plumes, to investigate subduction processes. There will be four types of analog lab experiments: 1) studies aimed at understanding longitudinal subduction vs. rollback (slab sinking), 2) experiments to study the role of rollback-style subduction on back arc basin spreading and plate motion, 3) experiments to look at the effects of oscillating longitudinal and rollback subduction on the thermal structure of the slab and wedge, and 4) the effects of this oscillation on generation of mantle diapirs in the wedge region. All these experiments have relevance to the processes being studied in the MARGINS program. Part of the work will be done at Australian National University (ANU) with Ross Griffiths, where Kincaid will spend a one-year sabbatical. This will take advantage of the excellent lab facilities available at ANU.