Geochemistry of pyroxene-phyric komatiites in the Southern Superior Province; Implications for Archean geodynamics

苏必利尔南部省辉石斑状科马提岩的地球化学；

• 批准号: RGPIN-2017-05362
• 负责人: Hollings, Peter
• 金额: $ 1.6万
• 依托单位: Lakehead University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=633736
• 关键词: Geochemistry; pyroxene; phyric; komatiites; Southern

Despite decades of research the nature of Archean plate tectonic processes remains the subject of considerable debate. The current discussion focuses on whether these processes were vertical or horizontal. This study of Archean pyroxene spinifex komatiites will help to resolve these questions by providing an improved model for Archean crustal evolution and the formation of the southern Superior margin during continental growth at ~2.7 Ga. By combining geochemical and isotopic studies of komatiites and associated siliceous high-magnesian basalts in well-mapped and geochronologically well-constrained greenstone belts along the length of the margin from Lake of the Woods to the Abitibi, it will be possible to evaluate the nature of Archean tectonic processes and compare them with those of the Phanerozoic.

尽管经过了几十年的研究，太古代板块构造过程的性质仍然是一个相当有争议的话题。目前的讨论集中在这些过程是纵向的还是横向的。通过对太古代辉石类刺铁岩的研究，将有助于解决这些问题，为太古代地壳演化和南部上级边缘在~ 2.7Ga大陆生长过程中的形成提供一个改进的模式。通过对从伍兹湖到阿比提比的边缘地带沿着已绘制好地图且地质年代学上已严格限定的绿岩带中的科马提岩和相关硅质高镁玄武岩进行地球化学和同位素研究，将有可能评估太古代构造过程的性质，并将其与古生代构造过程进行比较。