Volcanic beach sand, Devil's Island, Antarctica
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Devil's Island |
coarse-grained beach sand |
Location |
Beach on Devil's Island, West Antarctica, 63°48'S, 057°17'W ; east of James Ross Island) |
Depositional facies |
high-energy shoreline |
Provenance |
mafic to intermediary volcanic |
Composition |
pyroxene, hornblende, plagioclase, opaque ore minerals |
Texture |
oarse-grained (mean ca. 1500 µ), very poorly sorted, rounded |
Petrographic thin section:
Description |
Olive-green amphiboles and the black ore minerals are visible in the bright-field image. The translucent minerals in the dark field show the distinct first- and second-order colors and the cleavage of clinopyroxenes |
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Bright field |
Dark field |
Sample number |
heubeck0069 |
Collector |
Dr. Bernd Weber, Potsdam |
Date of sampling |
September 2005 |
Comments:
The composition of this beach sand is remarkable because of the the good preservation and dominace of minerals sensitive to chemical weathering
