| Autor: |
E. E Angino, M. D Turner, E. J Zeller |
| Rok vydání: |
1962 |
| Předmět: |
|
| Zdroj: |
Geological Society of America Bulletin. 73:1553 |
| ISSN: |
0016-7606 |
| DOI: |
10.1130/0016-7606(1962)73[1553:rgoltv]2.0.co;2 |
| Popis: |
The central part of Lower Taylor Valley consists of a thick, nearly vertical sequence of faulted metasedimentary rocks in sharp contact on the west with banded granitic rock. An Ar 40 /K 40 date of 500 ± 20 m.y. obtained on biotite separated from carbonate material indicates an Upper Cambrian-Lower Ordovician period of orogeny. A monzonitic gneiss sample from the west flank of Mt. Nussbaum yielded an Ar 40 /K 40 age of 425 ± 20 m.y. Four systems of lamprophyric dikes cut both the granitic and metasedimentary rocks, whereas several smaller pegmatitic and aplitic dikes are largely restricted to the granitic rocks. A sample collected from one of the lamprophyres gave an Ar 40 /K 40 date of 458 ± 20 m.y. Much of Taylor Valley is blanketed by morainal material deposited by Taylor Glacier and its tributaries. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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