Basal Adare volcanics, Robertson Bay, North Victoria Land, Antarctica: Late Miocene intraplate basalts of subaqueous origin
Open-File Report
2007-1047-SRP-045
By: N. Mortimer, W.J. Dunlap, M.J. Isaac, R.P. Sutherland, and K. Faure
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Abstract
Late Cenozoic lavas and associated hyaloclastite breccias of the Adare volcanics (Hallett volcanic
province) in Robertson Bay, North Victoria Land rest unconformably on Paleozoic greywackes. Abundant hyaloclastite
breccias are confined to a paleovalley; their primary geological features, and the stable isotope ratios of secondary
minerals, are consistent with eruption in a subaqueous environment with calcite formation probably involving seawater.
In contrast, the lavas which stratigraphically overlie the hyaloclastites on Mayr Spur probably were erupted subaerially.
K-Ar dating of eight samples from this basal sequence confirms the known older age limit (Late Miocene) of the Hallett
volcanic province. Geochemical data reveal an ocean island basalt-like affinity, similar to other Cenozoic igneous rocks
of the Hallett volcanic province. If a submarine eruptive paleoenvironment is accepted then there has been net tectonic
or isostatic post-Late Miocene uplift of a few hundred metres in the Robertson Bay-Adare Peninsula area
Suggested Citation
Mortimer, N., Dunlap, W., Isaac, M., Sutherland, R., Faure, K., 2007, Basal Adare volcanics, Robertson Bay, North Victoria Land, Antarctica: Late Miocene intraplate basalts of subaqueous origin: U.S. Geological Survey Open-File Report 2007-1047-SRP-045, 7 p., https://doi.org/10.3133/ofr20071047SRP045.
ISSN: 2331-1258 (online)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Basal Adare volcanics, Robertson Bay, North Victoria Land, Antarctica: Late Miocene intraplate basalts of subaqueous origin |
| Series title | Open-File Report |
| Series number | 2007-1047-SRP-045 |
| DOI | 10.3133/ofr20071047SRP045 |
| Year Published | 2007 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Description | 7 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 |