| NSF Org: |
EAR Division Of Earth Sciences |
| Recipient: |
|
| Initial Amendment Date: | June 28, 2004 |
| Latest Amendment Date: | June 28, 2004 |
| Award Number: | 0409684 |
| Award Instrument: | Standard Grant |
| Program Manager: |
Robin Reichlin
EAR Division Of Earth Sciences GEO Directorate for Geosciences |
| Start Date: | July 1, 2004 |
| End Date: | June 30, 2008 (Estimated) |
| Total Intended Award Amount: | $128,879.00 |
| Total Awarded Amount to Date: | $128,879.00 |
| Funds Obligated to Date: |
|
| History of Investigator: |
|
| Recipient Sponsored Research Office: |
1600 CAMPUS RD LOS ANGELES CA US 90041-3314 (323)259-1414 |
| Sponsor Congressional District: |
|
| Primary Place of Performance: |
1600 CAMPUS RD LOS ANGELES CA US 90041-3314 |
| Primary Place of
Performance Congressional District: |
|
| Unique Entity Identifier (UEI): |
|
| Parent UEI: |
|
| NSF Program(s): | Geophysics |
| Primary Program Source: |
|
| Program Reference Code(s): |
|
| Program Element Code(s): |
|
| Award Agency Code: | 4900 |
| Fund Agency Code: | 4900 |
| Assistance Listing Number(s): | 47.050 |
ABSTRACT
The goal of this study is to determine whether the unusual magnetism of two lava flows in the Sheep Creek Range (north central Nevada) resulted from extremely rapid (i.e., degrees/day) geomagnetic field change during a polarity reversal. In both flows, rock near the flow base, magnetized relatively early as the flow cooled, has a remanence direction similar to the lava flow directly below. Rock from the interior of the flow, presumably the last to cool and become magnetized, has a remanence direction much closer to the overlying flow. A similar pattern in a lava flow from Steens Mountain (Oregon), also magnetized during a geomagnetic polarity reversal, has been interpreted as evidence that the field was changing as fast as several degrees per day as the flow was cooling. Field change this rapid cannot be reconciled with commonly accepted ideas about deep-earth properties and processes.
The primary activity of this research will be a detailed paleomagnetic and rock magnetic study of samples to be collected on closely spaced vertical profiles through the two flows. The goal will to be fully characterize vertical changes in magnetization direction and inferred ancient field intensity and to determine whether rapid field change or some remagnetization process preferentially affecting the flow interiors can better explain the changes. The conclusion will depend strongly on whether there exists a correlation between rock magnetic properties and remanence direction consistent with the hypothesis of preferential remagnetization.
The broader impacts of this project are twofold. The first is to provide research opportunities to at least 5 Occidental College students over the next 3 years. Research is an integral part of the undergraduate program at Occidental College and the centerpiece of each student's experience as a geology major. In addition, this research will contribute toward an understanding of what future generations might experience in the not-to-distant future if (as some believe) the geomagnetic field is in the early stages of a polarity reversal. Knowledge of transitional field behavior in the geologic past can provide a rational basis for anticipating and adapting to an environment that will be different in significant ways from the one we live in now.
PUBLICATIONS PRODUCED AS A RESULT OF THIS RESEARCH
Note:
When clicking on a Digital Object Identifier (DOI) number, you will be taken to an external
site maintained by the publisher. Some full text articles may not yet be available without a
charge during the embargo (administrative interval).
Some links on this page may take you to non-federal websites. Their policies may differ from
this site.
Please report errors in award information by writing to: awardsearch@nsf.gov.
