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Thermal and chemical evolution of the oceanic lithosphere

海洋岩石圈的热演化和化学演化

基本信息

批准号：
283238-2007
负责人：
Coogan, Laurence
金额：
$ 2.12万
依托单位：
University of Victoria
依托单位国家：
加拿大
项目类别：
Discovery Grants Program - Individual
财政年份：
2007
资助国家：
加拿大
起止时间：
2007-01-01 至 2008-12-31
项目状态：
已结题

来源：
https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=364661
关键词：
Thermal chemical evolution oceanic lithosphere

项目摘要

The cooling of Earth's interior controls many planetary scale processes such as plate motions and the geodynamo. The plate tectonic paradigm involves the cooling of Earth's core and mantle largely through the subduction of cold plates. Further heat loss occurs via conduction through the plates. The relative importance of these processes depends principally on the cooling of the oceanic lithosphere between its creation at mid-ocean ridges and demise in subduction zones. However, the cooling and chemical evolution of the oceanic lithosphere are poorly understood. This is largely because the primary data used to constrain this, seafloor heat flow and bathymetry, cannot distinguish between existing models. I propose to use petrological and geochemical studies of the oceanic lithosphere to better understand the thermal and chemical evolution of the oceanic lithosphere. Studies of mantle xenoliths will constrain P-T-t paths in the deep portions of oceanic plates. Quantitative models of low-temperature hydrothermal alteration of the upper oceanic crust will help to constrain fluid fluxes in the off-axis. These data, combined with existing seafloor heat flow and bathymetry data, will be integrated into a model of the thermo-chemical evolution of oceanic plates and thus allow new insights into the thermal evolution of our dynamic planet.

地球内部的冷却控制着许多行星尺度的过程，如板块运动和地球发电机。板块构造范式涉及到地球核心和地幔的冷却，主要是通过冷板块的俯冲。进一步的热损失通过板的传导发生。这些过程的相对重要性主要取决于海洋岩石圈在洋中脊形成和俯冲带消亡之间的冷却。然而，人们对海洋岩石圈的冷却和化学演化却知之甚少。这在很大程度上是因为用于限制这一点的主要数据，海底热流和水深测量，不能区分现有的模型。我建议利用海洋岩石圈的岩石学和地球化学研究来更好地理解海洋岩石圈的热化学演化。对地幔捕虏体的研究将限制大洋板块深处的P-T-t路径。上洋地壳低温热液蚀变的定量模型将有助于约束离轴流体通量。这些数据，结合现有的海底热流和测深数据，将被整合到海洋板块的热化学演化模型中，从而为我们这个动态星球的热演化提供新的见解。