High-resolution airborne gravity imaging over James Ross Island (West Antarctica)
Open-File Report
2007-1047-SRP-060
By: T.A. Jordan, Fausto Ferraccioli, P.C. Jones, J.L. Smellie, M. Ghidella, H. F. J. Corr, and A.F. Zakrajsek
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Abstract
James Ross Island (JRI) exposes a Miocene-Recent alkaline basaltic volcanic complex that developed in a
back-arc, east of the northern Antarctic Peninsula. JRI has been the focus of several geological studies because it
provides a window on Neogene magmatic processes and paleoenvironments. However, little is known about its internal
structure. New airborne gravity data were collected as part of the first high-resolution aerogeophysical survey flown over
the island and reveal a prominent negative Bouguer gravity anomaly over Mt Haddington. This is intriguing as basaltic
volcanoes are typically associated with positive Bouguer anomalies, linked to underlying mafic intrusions. The negative
Bouguer anomaly may be associated with a hitherto unrecognised low-density sub-surface body, such as a breccia-filled
caldera, or a partially molten magma chamber.
Suggested Citation
Jordan, T., Ferraccioli, F., Jones, P., Smellie, J., Ghidella, M., Corr, H.F., Zakrajsek, A., 2007, High-resolution airborne gravity imaging over James Ross Island (West Antarctica): U.S. Geological Survey Open-File Report 2007-1047-SRP-060, 4 p., https://doi.org/10.3133/ofr20071047SRP060.
ISSN: 2331-1258 (online)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | High-resolution airborne gravity imaging over James Ross Island (West Antarctica) |
| Series title | Open-File Report |
| Series number | 2007-1047-SRP-060 |
| DOI | 10.3133/ofr20071047SRP060 |
| Year Published | 2007 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Description | 4 p. |
| Larger Work Type | Report |
| Larger Work Subtype | USGS Numbered Series |
| Larger Work Title | Antarctica: A Keystone in a Changing World--Online Proceedings for the Tenth International Symposium on Antarctic Earth Sciences. Santa Barbara, California, U.S.A.--August 26 to September 1, 2007 |
| Other Geospatial | Antarctica;James Ross Island |
| Additional Online Files (Y/N) | N |