Late quaternary high frequency geomagnetic field dynamics

晚第四纪高频地磁场动力学

• 批准号: 312343-2008
• 负责人: StOnge, Guillaume
• 金额: $ 1.82万
• 依托单位: Université du Québec à Rimouski
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2011
• 资助国家: 加拿大
• 起止时间: 2011-01-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=481221
• 关键词: Late; quaternary; frequency; geomagnetic; field

The long-term objectives of this research program are twofold: scientific and methodological. At the scientific level, the long-term goal is to reconstruct centennial to millennial changes in Earth's magnetic field direction and intensity during the Late Quaternary in order to determine the high frequency dynamics of the geomagnetic field with a special emphasis on abrupt changes. The recent recovery of several high resolution (>1 m/ka) sediment cores from Eastern Canada and the Western Canadian Arctic along with the planned recovery of sediment cores from the Northwest Passage and Eastern Canadian Arctic will allow the first large-scale study of geomagnetic field dynamics in the Arctic, as well as the determination of the spatial extent of abrupt geomagnetic field changes. Another long-term scientific goal is to determine the influence of Earth's magnetic field morphology on the production rate of cosmogenic isotopes. At the methodological level, the long-term goal is to develop paleomagnetic regional master curves (inclination, declination and paleointensity) for Eastern and Arctic Canada, allowing the dating and synchronization of Late Quaternary terrestrial, lacustrine, marine and possibly ice core records. In addition, because the magnetic properties of the sediments measured for paleomagnetic purposes depend on the mineralogy, grain size and concentration of the magnetic grains, I also envision combining magnetic and physical property data to develop a rapid, non-destructive and high resolution original method to identify lithological variations associated with paleoclimatic or environmental changes in Eastern and Arctic Canada.

该研究计划的长期目标是双重的：科学和方法。在科学方面，长期目标是重建晚第四纪期间地球磁场方向和强度的百年至千年变化，以确定地磁场的高频动态，特别强调突变。最近从加拿大东部和加拿大西部北极沿着采集了几个高分辨率（>1米/ka）沉积物岩心，并计划从西北航道和加拿大东部北极采集沉积物岩心，这将使人们能够首次大规模研究北极地磁场动态，并确定地磁场突变的空间范围。另一个长期的科学目标是确定地球磁场形态对宇宙成因同位素产生率的影响。在方法一级，长期目标是为加拿大东部和北极地区绘制古地磁区域主曲线（倾角、衰减和古强度），以便对晚第四纪陆地、湖泊、海洋和可能的冰芯记录进行定年和同步。此外，由于测量古地磁目的的沉积物的磁性取决于矿物学，粒度和磁性颗粒的浓度，我还设想结合磁性和物理性质的数据，开发一种快速，非破坏性和高分辨率的原始方法，以确定与加拿大东部和北极地区的古气候或环境变化相关的岩性变化。