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: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=649949
• 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.**

随着时间的推移，陆壳通过“超大陆”旋回反复合并和分裂，影响和/或控制了地球演化的大部分方面。不同矿床类型、火成岩组合和沉积盆地的幕式产出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，但我们对这些过程、空间和时间变化的理解是有限的，特别是当我们回到过去的时候。我们现代生活方式的生活质量取决于自然资源的持续可获得性，这需要发现更多的矿藏，包括以前未被勘探的地壳区域(绿地)中的矿藏。因此，需要更好地表示地球动力学背景、矿化作用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地理信息系统数据集中现有的主要数据汇编，解决目前重建限制最少的时间间隔，并评估处理数据的新方法，以改进板块重建。我研究的一个最终目标是发展一个从今天到太古宙晚期的重建模式。为今后五年提出的具体组成部分是：*目标1)评估新制定的衡量重建质量的标准，将其应用于选定的现有板块模型。*目标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，这应有助于形成板块重建模式。*目标3)通过“展开”几个主要的古生代造山斜，建立一个改进的中亚造山带部分地区的板块重建模型。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。*目标4)开发了一个改进的中-新元古代板块重建模型，将现有的古元古代‘努纳’模型与显生界地球演化模型联系起来。*在这些主题范围内整理的数据将被汇编，并通过现有的国际数据库，如StratDB和DateView，供未来研究使用，这两个数据库都是我以前设计和开发的。成功完成这项工作将需要与几位具有区域或学科专门知识的国际研究人员进行广泛合作。已经建立了一个协作者网络来协助这一工作，并将在必要时加以扩展，特别是在最近批准的IGCP 648项目的背景下，我是该项目的共同负责人。