Elongate summit calderas as Neogene paleostress indicators in Antarctica
Open-File Report
2007-1047-SRP-072
By: T.S. Paulsen and T. J. Wilson
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Abstract
The orientations and ages of elongate summit calderas on major polygenetic volcanoes were compiled to
document Miocene to Pleistocene Sh (minimum horizontal stress) directions on the western and northern flanks of the
West Antarctic rift system. Miocene to Pleistocene summit calderas along the western Ross Sea show relatively
consistent ENE long axis trends, which are at a high angle to the Transantarctic Mountain Front and parallel to the
N77ºE Sh direction at Cape Roberts. The elongation directions of many Miocene to Pleistocene summit calderas in
Marie Byrd Land parallel the alignment of polygenetic volcanoes in which they occur, except several Pleistocene
calderas with consistent NNE to NE trends. The overall pattern of elongate calderas in Marie Byrd Land is probably due
to a combination of structurally controlled orientations and regional stress fields in which Sh is oriented NNE to NE at a
moderate to high angle to the trace of the West Antarctic rift system.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Elongate summit calderas as Neogene paleostress indicators in Antarctica |
| Series title | Open-File Report |
| Series number | 2007-1047-SRP-072 |
| DOI | 10.3133/ofr20071047SRP072 |
| Year Published | 2007 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Description | 6 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 |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |