INNOVATIONS IN FELDSPAR LUMINESCENCE DATING AND APPLICATION TO PALEOCLIMATOLOGICAL STUDIES

长石发光测年的创新及其在古气候研究中的应用

• 批准号: 37375-2013
• 负责人: Lamothe, Michel
• 金额: $ 2.91万
• 依托单位: Université du Québec à Montréal
• 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=633826
• 关键词: INNOVATIONS; FELDSPAR; LUMINESCENCE; DATING; APPLICATION

Our planet is facing a critical part of its history as modern societies need to implement adaptation strategies to rapidly changing surface environments in response to global warming. The geological record contains sedimentary archives that can be used to interpret the resilience or sensitivity of physical environments to climate change. The main objective of this research program is therein to develop new methodologies in the field of feldspar luminescence dating for assessing the chronology of climate-sensitive geological and archaeological sedimentary archives. The scientific approach is to focus on the luminescence properties of single feldspar grains in sediments. Due to the nature of its solid-state physics, luminescence dating of feldspar shall be applicable to the last 500 000 years. This method can therefore probe 10 times deeper into geological time than radiocarbon and more than 5 times the current age range of quartz optically-stimulated luminescence (OSL). The routine technology for measuring luminescence in feldspar is to use infrared photons to stimulate luminescence, hence the term IRSL. In this research program, we propose to follow up on a novel approach that consists in dating sediments from only unfading feldspars. This novel technology is now possible following the development of new instrumentation in single grain readers, most of these are now available in the Montréal laboratory as a result of a major CFI funding to the UQAM geochronology group. The novelty of this research and its upmost significance is in providing access to a new chronological tool for the natural sciences community involved in the science of Global Changes. My research group and the Montréal laboratory have been at the forefront of the IRSL dating research field for two decades. The development of this new dating technology shall insure this international leadership remains in Canada.

我们的星球正面临着其历史的关键部分，因为现代社会需要针对快速变化的地表环境实施适应策略，以应对全球变暖。地质记录包含沉积档案，可用于解释自然环境对气候的恢复力或敏感性。该研究计划的主要目标是开发长石发光测年领域的新方法，以评估气候敏感的地质和考古沉积档案的年代学，其科学方法是关注单个物质的发光特性。由于其固态物理学的性质，长石的发光测年适用于过去 50 万年，因此该方法可以比放射性碳探测更深 10 倍的地质时间，是目前的 5 倍以上。石英光激发光 (OSL) 的年龄范围 长石发光测量的常规技术是使用红外光子来激发发光，因此得此术语。在这项研究计划中，我们建议采用一种新颖的方法，即仅对不褪色的长石中的沉积物进行年代测定，随着单颗粒读数器的新仪器的开发，这种新技术现在已经成为可能，其中大多数现在都可以使用。这项研究的新颖性及其最重要的意义在于为参与全球科学的自然科学界提供了一种新的年代学工具。变化。二十年来，我的研究小组和蒙特利尔实验室一直处于 IRSL 测年研究领域的前沿，这项新测年技术的发展将确保加拿大保持这一国际领先地位。