Upgrade of Spinner Magnetometer for Continuing and New Paleomagnetic Research Objectives at Tufts University

塔夫茨大学升级旋转磁力计以实现持续和新的古地磁研究目标

• 批准号: 1934221
• 负责人: John Ridge
• 金额: $ 5.25万
• 依托单位: Tufts University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-03-01 至 2022-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1934221&HistoricalAwards=false
• 关键词: Upgrade; Spinner; Magnetometer; Continuing; New

This Division of Earth Sciences Instrumentation and Facilities Program award supports acquisition of an Agico JR-6 Dual Speed Spinner Magnetometer to measure magnetism in oriented geological samples at Tufts University. The instrument would replace a 32-year old and no longer functional magnetometer. The magnetometer measures: polarity, which varies between a normal polarity, like the present Earth’s field, and a reversed field in which magnetic directions are flipped 180 degrees from today’s field; magnetic declination, which is a measurement of how the field direction differs from true north; and magnetic inclination, which is the dip away from horizontal of Earth’s magnetic field direction at any given place. Time varying magnetic signature of rocks and sediments are used for correlation and age dating. Student training in paleomagnetic methods and research applications will be advanced with the acquisition and the investigator plans local outreach through guided field trips and production of educational materials targeted at K-12 teachers and students to advance awareness of the Earth’s magnetic field and its time varying dynamic behavior.Research projects that will immediately benefit from the new magnetometer include study of: the chronology and spatial distribution of glacial varve deposition in New England and by inference the history and mechanisms of Quaternary glacial activity in the region; the tectonic and paleogeographic history of Neoproterozoic rocks of the Avalon terrane; the pre-Wisconsinan glacial history of New England based on determination of the chronology of subglacial till and intra-till lake deposits.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

美国塔夫茨大学地球科学部仪器和设施项目授予了Agico JR-6双速旋转磁力计，用于测量定向地质样品的磁性。这台仪器将取代一台已经使用了32年且不再工作的磁力计。磁力计测量的是：极性，它在正常极性（如现在的地球磁场）和反向磁场（磁场方向与今天的磁场翻转180度）之间变化；磁偏角，这是测量磁场方向与真北的差异；以及磁倾角，即在任何给定地点远离地球磁场方向水平方向的倾角。岩石和沉积物的时变磁特征用于对比和定年。学生在古地磁方法和研究应用方面的培训将随着此次收购而推进，研究者计划通过有指导的实地考察和针对K-12教师和学生的教育材料的制作来提高对地球磁场及其随时间变化的动态行为的认识。将立即受益于新磁力计的研究项目包括：研究新英格兰冰川阀沉积的年代学和空间分布，并由此推断该地区第四纪冰川活动的历史和机制；阿瓦隆地体新元古代岩石的构造和古地理史；新英格兰的前威斯康辛冰川史是基于对冰下耕地和耕地内湖泊沉积物年代学的确定。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。