Saved in:
| Main Author: | |
|---|---|
| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
2007
|
| Subjects: | |
| Online Access: | https://doi.org/10.1594/PANGAEA.605207 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1867169496179933184 |
|---|---|
| author | Adams, Christopher J |
| author_facet | Adams, Christopher J |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | K-Ar ages of 82 slate and schist (white-mica-rich whole rock) samples are reported for Late Precambrian-Early Ordovician metamorphic rocks of the Wilson, Bowers and Robertson Bay terranes of northern Victoria Land. These are amalgamated in two vertical sections along composite NE-SW horizontal profiles across (1) Oates Coast in the north, and (2) Terra Nova Bay area in the south. The ages are in the range 328-517 Ma. Both profiles show some age variation with altitude, but more importantly, they define an inverted wedge shaped pattern, reflecting a „pop-up“ strucure. This is oriented NW-SE at the eastern margin of the Wilson terrane, and the edges coincide with the Exiles and Wilson Thrusts which cross the region. Ages inside the "pop-up" structure are younger, ca. 460-480 Ma, than those along its eastern and western flanks, ca. 490-520 Ma. The K-Ar age patterns thus demonstrate a late Ross Orogenic age (ca. 460 Ma) for this structure, which may be associated with assembly of the Wilson and Bowers terranes. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_605207 |
| institution | PANGAEA |
| language | en |
| publishDate | 2007 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | K-Ar age determination of Paleozoic rock samples from northern Victoria Land, Antarctica Adams, Christopher J GXV110; GXV113; GXV116; GXV120; GXV86A; OUTCROP; Outcrop sample; Victoria Land, Antarctica K-Ar ages of 82 slate and schist (white-mica-rich whole rock) samples are reported for Late Precambrian-Early Ordovician metamorphic rocks of the Wilson, Bowers and Robertson Bay terranes of northern Victoria Land. These are amalgamated in two vertical sections along composite NE-SW horizontal profiles across (1) Oates Coast in the north, and (2) Terra Nova Bay area in the south. The ages are in the range 328-517 Ma. Both profiles show some age variation with altitude, but more importantly, they define an inverted wedge shaped pattern, reflecting a „pop-up“ strucure. This is oriented NW-SE at the eastern margin of the Wilson terrane, and the edges coincide with the Exiles and Wilson Thrusts which cross the region. Ages inside the "pop-up" structure are younger, ca. 460-480 Ma, than those along its eastern and western flanks, ca. 490-520 Ma. The K-Ar age patterns thus demonstrate a late Ross Orogenic age (ca. 460 Ma) for this structure, which may be associated with assembly of the Wilson and Bowers terranes. |
| title | K-Ar age determination of Paleozoic rock samples from northern Victoria Land, Antarctica |
| topic | GXV110; GXV113; GXV116; GXV120; GXV86A; OUTCROP; Outcrop sample; Victoria Land, Antarctica |
| url | https://doi.org/10.1594/PANGAEA.605207 |