CAREER: Full-vector Characterization of the recent (0-5 Myr) Geomagnetic field using novel magnetic field recorder

University Of Florida, Gainesville FL

Investigators

Abstract

Earth’s magnetic field acts as a shield that protects Earth from dangerous magnetic storms and cosmic radiation which have the potential to damage technical infrastructure, strip away Earth’s atmosphere, and ultimately harm life. Due to its importance to habitability and modern technical infrastructure, it is critical to understand how Earth’s magnetic field has varied through Earth’s past, in addition to how it might change in the future. To do this, it is necessary to characterize the spatial and temporal variations of the magnetic field using paleomagnetism, in which ancient records of the field are measured from rocks. Due to a sparsity of paleomagnetic data and gaps in paleomagnetic education and training, our ability to understand past behavior and predict future behavior is hampered. This project aims to improve the characterization of geomagnetic field behavior by filling in important data gaps in the current paleomagnetic record using a novel recorder of geomagnetic field behavior, clinkers, or rocks baked and burned by coal seam fires from the Powder River Basin, USA. This aim will be further enhanced through the development of a new paleomagnetism general education course and experiential learning research experience on clinkers as part of the University of Florida’s (UF) Quest program, and the development of a paleomagnetism-focused workshop for high-school age 4-H club members as a part of UF Extension Services’ program, 4-H University. These programs will educate a broad audience in the fields of paleomagnetism and Earth Science, while simultaneously attracting new students to Earth Science degrees, paleomagnetic research, and ultimately the STEM workforce. Despite being a fundamental feature of our planet, our understanding of Earth’s magnetic field is incomplete. Currently, there are many gaps in the state of knowledge including: 1) what drives the magnetic field? 2) what causes magnetic reversals? and 3) how does the magnetic field vary spatially? These gaps in knowledge are further exacerbated by an education gap. Paleomagnetism can provide insight into multiple geoscience disciplines, yet as a topic it typically receives little attention in geoscience training. This impacts the ability of the geoscience community to understand paleomagnetic research in addition to the ability to fill in critical gaps in understanding of the magnetic field. What is needed to fill in these critical gaps is both more high-quality full-vector (direction and intensity) paleomagnetic data in addition to a trained workforce to collect and analyze these data. The aim of this project is to fill these needs by improving the characterization of recent (0–5 Myr) geomagnetic field behavior using a novel recorder of geomagnetic field behavior, clinkers. Clinkers, rocks baked and burned by coal seam fires, are an exciting new candidate for obtaining high-quality full-vector magnetic records as they occur throughout the world, are located in regions lacking magnetic data, can be reliably dated, and are reliable full-vector magnetic recorders. In this project, state-of-the-art paleomagnetic and geochronologic techniques will be utilized, generating a semi-continuous, high-resolution, full-vector record of magnetic field variations for Quaternary to Pliocene (0–5 Myr) age clinker deposits from the Powder River Basin (PRB), USA. This research is the first step in building a reliable methodology to expand work on clinker deposits outside of the PRB. The education and outreach components of this project will train the next generation of paleomagnetists and broaden the understanding of paleomagnetic research within the geosciences and the general population. This project is an early step in a continuum of research and education that will lead to an improved global characterization of the magnetic field. More generally, this project addresses science priority question one, “How is Earth’s internal field generated?”, released in the National Academies decadal report for NSF-EAR. 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.