Plate reconstruction context for variations in geodynamic, magmatic and mineralisation processes

地球动力学、岩浆和矿化过程变化的板块重建背景

• 批准号: RGPIN-2016-06298
• 负责人: Eglington, Bruce
• 金额: $ 1.75万
• 依托单位: University of Saskatchewan
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=710249
• 关键词: Plate; reconstruction; context; variations; geodynamic

Repeated amalgamation and splitting apart of continental crust through time via the 'supercontinent' cycle have influenced and/or controlled most aspects of earth's evolution. Episodic occurrences of different mineral deposit types, igneous petrological associations and sediment basins are influenced by a variety of geodynamic controls, all of which appear to be interrelated but our understanding of the processes, spatial and temporal variations is limited, particularly as we move back in time. Quality of life in our modern lifestyles is dependent on the continued availability of natural resources which requires the discovery of additional mineral deposits, including ones in crustal domains not previously explored ('greenfields' terrains). A better representation of the interplay of geodynamic setting, mineralisation and sedimentary depositional environment is thus required. I and my students will utilise major compilations of data now available in various international databases and GIS data sets to address time intervals for which reconstructions are currently least well constrained and to assess new ways to work with data so as to refine plate reconstructions. An ultimate objective for my research is the development of a reconstruction model from present day to the Late Archaean. Specific components proposed for the next five years are: OBJECTIVE 1) Assess newly developed criteria for measurement of reconstruction quality by applying them to selected existing plate models. OBJECTIVE 2) Investigate the geographic, temporal and geodynamic setting of igneous rock lithogeochemistry to better delineate changing sources and processes which ought to help inform plate reconstruction models. OBJECTIVE 3) Develop an improved plate reconstruction model for parts of the Central Asian Orogenic Belt by unfolding' several major Palaeozoic oroclines. Current plate models over-simplify the geometry of plates from this region which limits our ability to reconstruct earlier time intervals. OBJECTIVE 4) Develop an improved plate reconstruction model for Meso- to Neo-Proterozoic time to link an existing model for Palaeoproterozoic Nuna' with models for Phanerozoic earth evolution. Data collated within the context of these topics will be compiled and made available for future research via existing international databases such as StratDB and DateView, both previously designed and developed by myself. Successful completion will require extensive collaboration with several international researchers with regional or discipline-specific expertise. A network of collaborators has been developed to assist with this and will be extended where necessary, particularly within the context of the recently approved IGCP 648 project of which I am a co-leader.

通过“超大陆”循环，大陆地壳的反复合并和分裂已经影响和/或控制了地球演化的大部分方面。不同矿物存款类型、火成岩组合和沉积盆地的幕式出现受到各种地球动力学控制的影响，所有这些似乎都是相互关联的，但我们对过程、空间和时间变化的理解是有限的，特别是当我们回到过去时。我们现代生活方式的生活质量取决于自然资源的持续可用性，这需要发现更多的矿藏，包括以前未勘探的地壳区域（“绿地”地形）。因此，需要更好地代表地球动力学背景、矿化和沉积沉积环境的相互作用。 我和我的学生将利用各种国际数据库和GIS数据集中现有的主要数据汇编，以解决重建目前最不受约束的时间间隔，并评估使用数据的新方法，以改进板块重建。我的研究的最终目标是发展一个重建模型，从今天到晚巴比伦。为今后五年提出的具体组成部分是： 目的1）通过将新开发的重建质量测量标准应用于选定的现有接骨板模型，评估这些标准。 目的2）调查火成岩岩石地球化学的地理，时间和地球动力学背景，以更好地描绘变化的来源和过程，这应该有助于通知板块重建模型。 目的3）通过对几个主要古生代造山带的展布，建立中亚造山带部分地区的板块再造模型。目前的板块模型过度简化了该地区板块的几何形状，这限制了我们重建早期时间间隔的能力。 目的4）建立一个改进的中新元古代板块重建模型，将古元古代Nuna'模型与古元古代地球演化模型联系起来。 在这些主题的背景下整理的数据将被编译，并通过现有的国际数据库，如StratDB和DateView，都是由我自己设计和开发的，提供给未来的研究。成功完成将需要与几个具有区域或学科特定专业知识的国际研究人员进行广泛合作。已经建立了一个合作者网络来协助开展这项工作，并将在必要时予以扩大，特别是在最近批准的IGCP 648项目（我是该项目的共同领导人之一）的范围内。