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 |
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Provenance:
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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 |
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Composition of the sand, mineralogy, ecc.
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Texture:
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Texture of the grains, ecc.
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Sample Number:
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number of the sample
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Collector:
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Collector of the sand, Institution
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Date:
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Date of sampling
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Comments:
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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 | |
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
Additional data pageFurther comments on the sand, depositional history, ecc.