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Carbonate
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sand,
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Plage
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de
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St.
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Jean,
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St.
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Barthelmy,
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Caribbean
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Plage de St. Jean, St. Barthelmy | Fragments of red algae |
Location | Beach, Plage de St.Jean, St. Barthelmy, Caribbean |
Depositional facies | replace this with text about the dep facies |
Provenance | Diverse and typical mixture of carbonate fragments of marine provenance and some quite particular VRFs and MRFs of landward andesitic provenance |
Composition | 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 |
Texture | Medium sand (ca. 350 µ), moderately sorted, subangular |
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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 |
Sample number | heubeck0077 |
Collector | Christoph Heubeck, Institut für Geologische Wissenschaften, FU Berlin |
Date 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
