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