The Last Geomagnetic Intensity Cycle Initiative: A constrained time interval to build cross-disciplinary geomagnetic collaboration
Abstract
Dedicated to the memory of Neil Opdyke, a mentor and a friend.
Our limited understanding of the geomagnetic field results, at least in part, because many of our paleo-geomagnetic observations are insufficiently constrained to guide theoretical considerations. These limitations can stem from uncertainties in geochronology, lack of suitable paleomagnetic archives, unknowns in the magnetization acquisition processes, and other factors. Here we argue that a concerted community effort focused on a constrained time interval can help overcome these limitations—an initiative we call the Last Geomagnetic Intensity Cycle—which spans the last 50 ka. The reason for this is threefold. First,the last intensity cycle captures much of what the geomagnetic field is capable of (excursions, PSV, intensity extrema). Second, as this is a fairly recent time interval, more, and especially high-resolution records, are accessible. Third, this time intervals overlaps with the radiocarbon era, stratigraphic templates provided by polar ice cores, and U/Th dated speleothems. As such, robust independent chronologies with well constrained uncertainties can be transparently developed. Here we will provide examples of new PSV (directions and relative paleointensity) insights that span this time interval and outline approaches that can be used to help facilitate observations needed to foster cross-disciplinary collaborations towards a better understanding of the deep earth.- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFMGP43B0806S
- Keywords:
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- 1507 Core processes;
- GEOMAGNETISM AND PALEOMAGNETISM;
- 1510 Dynamo: theories and simulations;
- GEOMAGNETISM AND PALEOMAGNETISM;
- 1517 Magnetic anomalies: modeling and interpretation;
- GEOMAGNETISM AND PALEOMAGNETISM;
- 1527 Paleomagnetism applied to geologic processes;
- GEOMAGNETISM AND PALEOMAGNETISM;
- 1560 Time variations: secular and longer;
- GEOMAGNETISM AND PALEOMAGNETISM;
- 1595 Planetary magnetism: all frequencies and wavelengths;
- GEOMAGNETISM AND PALEOMAGNETISM;
- 5440 Magnetic fields and magnetism;
- PLANETARY SCIENCES: SOLID SURFACE PLANETS