Petrogenesis of Acasta Gneisses, NWT

西北地区阿卡斯塔片麻岩的岩石成因

• 批准号: 408428-2011
• 负责人: Chacko, Thomas
• 金额: $ 1.09万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Northern Research Supplement
• 财政年份: 2014
• 资助国家: 加拿大
• 起止时间: 2014-01-01 至 2015-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=551083
• 关键词: Petrogenesis; Acasta; Gneisses; NWT

Earth's continental and oceanic crust, the combination of which is unique in the solar system, has played a central role in the evolution of the 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 investigate the oldest known rocks on Earth, the circa 4 billion year old Acasta gneisses of the northwestern Canadian Shield. The project aims to determine the major-element, trace-element and oxygen isotope composition of these rocks and to use these data to understand the processes responsible for the formation of this ancient piece of continental crust.

地球的大陆地壳和海洋地壳的结合在太阳系中是独一无二的，它们在地球岩石圈、大气和生物圈的演化中发挥了核心作用。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，我建议研究地球上已知最古老的岩石，大约40亿年历史的加拿大地盾西北部的阿卡斯塔片岩。该项目旨在确定这些岩石的主元素、微量元素和氧同位素组成，并利用这些数据来了解这片古老大陆地壳形成的过程。