Precambrian crustal growth in the Canadian shield: investigating a billion year of tectono-magmatic evolution in the Winnipeg River subprovince, Ontario, Canada

加拿大地盾中的前寒武纪地壳生长：调查加拿大安大略省温尼伯河副省十亿年的构造岩浆演化

• 批准号: RGPIN-2021-03199
• 负责人: Perrouty, Stéphane
• 金额: $ 2.19万
• 依托单位: Laurentian University of Sudbury
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=742431
• 关键词: Precambrian; crustal; growth; Canadian; shield

Plate tectonics (i.e., plate movement and interaction) occurred throughout all Earth's history, but driving forces and associated processes evolved during the Archean and Proterozoic eons, and resulted in global tectonic, magmatic, and environmental changes. Ultimately, these changes have implications on the nature, abundance and spatial distribution of base (e.g., Ni, Cu, Zn), precious (e.g., Au) and strategic (e.g., Li-REE-Nb-Ta) metal deposits in Precambrian shields. Each continental crust fragment of Precambrian age represents a piece of the puzzle, however their integration in a unified, global-scale, plate tectonics evolutionary model is challenging. The long term objective of this research program is to use multi-disciplinary approaches to propose a comprehensive geodynamic interpretation of the Canadian shield, and test it against other well documented Precambrian cratons in South Africa, Australia, West Africa and South America. The Canadian shield is an ideal study area that includes some of the largest Archean crustal fragments (e.g., Superior Province) that are bounded by extensive Paleoproterozoic orogenic belts (e.g., Trans-Hudson), and displays a nearly continuous crustal growth and recycling spanning half of the Earth's history (i.e., from 4.0 Ga to 1.8 Ga). In this program, the emphasis will be on the structural, metamorphic and geochemical evolution of the Precambrian continental crust, and its implications to prospect for natural resources. In the next five years, the short term objective is to unravel a billion year of Archean crustal history in the Winnipeg River subprovince, between Sioux Lookout and Kenora, north-western Ontario. The variety of ages, rocks types, structural patterns and metamorphic grades in the Winnipeg River subprovince makes it an appropriate study area to decipher the broader geodynamic evolution of the western Superior Province. This research program will: (1) develop a new understanding of crustal growth and recycling in the Winnipeg River subprovince, using structural, geochronological, lithogeochemical, and metamorphic constraints; (2) recognize possible secular geodynamic changes between the Paleo- Meso- and Neoarchean evolution of the Winnipeg River subprovince; (3) propose a revised tectono-stratigraphic model of the western Superior Province, and test its implications for Archean geodynamic processes, which will be a first step toward the long term objective of this research program; (4) deliver a comprehensive and multi-disciplinary study of a gneiss-granitoid "pinkstone" belt in the Superior Province, with integrated investigations on the origin and distribution of strategic metal occurrences, which may assist future exploration projects and ultimately enhance the mineral resources potential of north-western Ontario.

板块构造（即板的运动和相互作用）发生在整个地球的历史中，但是在大将和proterorogic eons期间演变的驱动力和相关过程，并导致了全球构造，岩浆和环境变化。最终，这些变化对基础（例如Ni，Cu，Zn），珍贵（例如，AU）和战略性（例如Li-ree-NB-TA）金属沉积物的性质，丰度和空间分布具有影响。前寒武纪时代的每个大陆地壳碎片都代表了一个难题，但是它们在统一的，全球尺度的，板块构造进化模型中的整合都具有挑战性。该研究计划的长期目标是使用多学科的方法对加拿大盾牌提出了全面的地球动力学解释，并对南非，澳大利亚，西非和南美的其他有据可查的前寒武纪对其进行测试。加拿大盾牌是一个理想的研究区域，其中包括一些最大的大古壳碎片（例如上级省），其受广泛的古近代造山带（例如，跨性别型）的范围，并显示了几乎连续的地壳生长和地球历史的一半范围，即从4.0 ga到4.0 ga）。在该计划中，重点将放在前寒武纪大陆壳的结构，变质和地球化学演化上，及其对自然资源前景的影响。在接下来的五年中，短期目标是在温尼伯河Subprovince（Sioux Lookout）和安大略省西北部的Kenora之间揭开温尼伯河Subprovince的数十亿年。温尼伯河Subprovince的各种年龄，岩石类型，结构模式和变质等级使其成为一个适当的研究区域，以破译西部上级省的更广泛的地球动力进化。该研究计划将：（1）使用结构，年代学，岩性地球化学和变质的约束，对温尼伯河Subprovince的地壳生长和回收有了新的了解； （2）认识到温尼伯河Subprovince的古细胞和新结构演变之间可能的世俗地球动力学变化； （3）提出了一个修订后的西部省省的构造 - 地层模型，并检验其对大帝地球动力学过程的影响，这将是朝着该研究计划的长期目标迈出的第一步； （4）对高级省的片麻岩粒类“粉红色石”带进行了全面的多学科研究，并对战略金属事件的起源和分布进行了综合研究，这可能有助于未来的勘探项目，并最终增强了安大略省西北安大略省的矿产资源的潜力。