Evolution of Earth’s Earliest Crust

地球最早地壳的演化

• 批准号: RGPIN-2016-04479
• 负责人: Chacko, Thomas
• 金额: $ 3.06万
• 依托单位: University of Alberta
• 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=634056
• 关键词: Evolution; Earth; Earliest; Crust

Earth’s continental and oceanic crust, the combination of which is likely unique in the solar system, plays a central role in the operation of our planet’s lithosphere, atmosphere, and biosphere. The mechanisms by which this crust formed and stabilized early in Earth history remains one of the outstanding questions in the geological sciences. In this application, I propose to address this question by expanding my on-going research program on the Acasta Gneiss Complex (AGC) of the Northwest Territories. The AGC arguably contains the oldest rocks in the world (4.02 billion years old) and is certainly one of the few locations worldwide where evidence can be brought to bear on the first one billion years of Earth history. Despite its status as an old crust locality, much of the AGC remains unstudied. In particular, all previous studies of the AGC have focused exclusively on a ~30 km

地球的大陆地壳和海洋地壳的结合在太阳系中可能是独一无二的，它们在地球岩石圈、大气和生物圈的运作中起着核心作用。这个地壳在地球历史早期形成和稳定的机制仍然是地质科学中悬而未决的问题之一。在这个申请中，我建议通过扩展我正在进行的西北地区阿卡斯塔片麻岩复杂（AGC）的研究项目来解决这个问题。AGC可以说包含了世界上最古老的岩石（40.2亿年），当然也是世界上为数不多的可以证明地球前10亿年历史的地方之一。尽管它是一个古老的地壳地区，但AGC的大部分地区仍未被研究。特别是，所有以前的AGC研究都集中在~30公里