Carbonate sand, Plage de St. Jean, St. Barthelmy, Caribbean
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Plage de St. Jean, St. Barthelmy | Fragments of red algae |
Location |
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Beach, Plage de St.Jean, St. Barthelmy, Caribbean | |
Depositional facies | replace this with text about the dep facies |
Provenance |
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Diverse and typical mixture of carbonate fragments of marine provenance and some quite particular VRFs and MRFs of landward andesitic provenance | |
Composition |
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Dominant white carbonate sand (CaCO3, calcite and aragonite); few fractions of quartz, chlorite?, hornblende, fine grained and dark mafic rock fragments (Lv), intermediary plutonic fragments, black obsidian | |
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Texture | Medium sand (ca. 350 µ), moderately sorted, subangular Fragments of red algae |
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Petrographic thin section:
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Description | Characteristic "finger print" red algae, tubular serpulids, few benthic foraminifera, radial coralline sceletal fragments, angular echinoid plate |
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Bright field | Dark field |
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Texture:
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Sample |
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number | heubeck0077 |
Collector |
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Christoph Heubeck, Institut für Geologische Wissenschaften, |
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FU Berlin |
Date |
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of sampling | 2004 |
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Comments:
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Dominated by white, fine cristalline, porous coralline sceletal fragments (>90%), accessory transparent opaline sponge spiculae, fragments of bryozoa, few hyaline brown mollusca, large ovoid benthic foraminifera, angular echinoderm plates, rarely ostracoda, possibly plates from calcareous algae
