Geology of the Byrd Glacier Discontinuity (Ross Orogen): New survey data from the Britannia Range, Antarctica
Open-File Report
2007-1047-SRP-030
By: R. Carosi, F. Giacomini, F. Talarico, and E. Stump
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Abstract
Field activities in the Britannia Range (Transantarctic Mountains, Antarctica) highlighted new geological
features around the so-called Byrd Glacier discontinuity. Recent field surveys revealed the occurrence of significant
amounts of medium- to high-grade metamorphic rocks, intruded by abundant coarse-grained porphyritic granitoids.
Most of the granitoids are deformed, with foliation parallel to the regional foliation in the metamorphics. Two main
episodes of deformation are observed. Tight to isoclinal folds and penetrative axial plane foliation are related to the D1
phase, open folds to the D2. The main foliation (D1) trends nearly E-W in agreement with the trend in the southern
portion of the Byrd Glacier. In most outcrops, granitic dykes are folded and stretched by the D2 deformation, which
shows similar characteristics with the D2 deformation south of the Byrd Glacier. This suggests the occurrence in the
Ross orogen of an orogen-normal structure south and north of the Byrd Glacier.
Suggested Citation
Carosi, R., Giacomini, F., Talarico, F., Stump, E., 2007, Geology of the Byrd Glacier Discontinuity (Ross Orogen): New survey data from the Britannia Range, Antarctica: U.S. Geological Survey Open-File Report 2007-1047-SRP-030, 6 p., https://doi.org/10.3133/ofr20071047SRP030.
ISSN: 2331-1258 (online)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Geology of the Byrd Glacier Discontinuity (Ross Orogen): New survey data from the Britannia Range, Antarctica |
| Series title | Open-File Report |
| Series number | 2007-1047-SRP-030 |
| DOI | 10.3133/ofr20071047SRP030 |
| 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 |