Miocene-Pliocene ice-volcano interactions at monogenetic volcanoes near Hobbs Coast, Marie Byrd Land, Antarctica
Open-File Report
2007-1047-SRP-074
By: T.I. Wilch and W. C. McIntosh
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Abstract
Paleoenvironmental reconstructions and
40
Ar/
39
Ar geochronology of seven eroded monogenetic volcanoes
near the Hobbs Coast, Marie Byrd Land, West Antarctica provide proxy records of WAIS paleo-ice-levels in Miocene-Pliocene times. Interpretations, based on lithofacies analysis, indicate whether the volcanoes erupted below, near, or
above the level of the ice sheet. Our interpretations differ significantly from previous interpretations as they highlight
the abundant evidence for ice-volcano interactions at emergent paleoenvironments but limited evidence of higher-than-present syn-eruptive ice-levels. Evidence for subglacial volcanic paleoenvironments is limited to Kennel Peak, a ~8 Ma
volcano where a pillow lava sequence extending 25 m above current ice level overlies an inferred glacial till and
unconformity. A major complication in the Hobbs Coast region is that the volcanism occurred on interfluves between
regions of fast-flowing ice. Such a setting precludes establishing precise regional paleo-ice-levels although the presence
or absence of ice at times of eruptions can be inferred.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Miocene-Pliocene ice-volcano interactions at monogenetic volcanoes near Hobbs Coast, Marie Byrd Land, Antarctica |
| Series title | Open-File Report |
| Series number | 2007-1047-SRP-074 |
| DOI | 10.3133/ofr20071047SRP074 |
| 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 |
| Google Analytic Metrics | Metrics page |