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6 results for “Coccolith”
Fig. 1 in Procedures for Obtaining Optimal SEM Images of Coccolithophore Debris in Coccolith Limestones
Fig. 1. CCI images of coccolith material in different stages of fragmentation within faecal pellets in coccolith limestone. Cross−sections of complete and dismembered, variously oriented, coccospheres allow to observe their structures. A. Perpendicular cross−section of a coccosphere with well visible distal (d) and proximal (p) shields of placoliths joined by parallel calcite crystallites in wide central area (c). Interlocking of adjacent edges of placolith shields is particularly well visible. The structure of the central area is well visible as a net in horizontal cross−section of the plate in the right (c1), ZNG PAN B−III−75/3. B. Perpendicular cross−sections of coccospheres clearly show distal (d) and proximal (p) shields of placoliths, and central areas (c). The central areas are seen as narrow massive or open structures, depending on the orientation of cross−sections (compare c and c1). Note the very tight interlocking of adjacent edges of placolith shields and additional placoliths (x) within the coccosphere. The structures closing the central area are seen as a narrow open structure in horizontal view of placoliths (c2), ZNG PAN B−III−75/5. Both images were obtained in ESEM using SE under low vacuum, from non−coated polished thin section at WD, 10.1 mm, SS, 37 s/frame.
Morphological measurements of coccoliths from surface samples of South China Sea
<p>The dataset compiles morphological measurements of coccoliths (<em>Gephyrocapsa</em> spp. and <em>Emiliania huxleyi</em>, >2µm) from surface samples of the South China Sea retrieved at different depths of the basin during the R/V Sonne cruises (SO-95); and of Gephyrocapsa spp. from one sample from the Western Equatorial Pacific (ODP 807A, -2H-2W, 57-59 cm) used in a dissolution experiment. The columns include station names, Longitude, Latitude, Depth (m), how much Calgon was added into sediment suspension (in the dissolution experiment), number of coccoliths measured per sample, mean ks shape factor, thickness, length, volume, mass, and standard deviation of mean ks/mean ks.</p>
Latest Eocene to mid-late Oligocene calcareous nannoplankton assemblage relative abundance counts and coccolith size measurements: IODP Site U1553
<p>Calcareous nannoplankton are a major group of calcifying marine phytoplankton. Their distribution, productivity and cellular morphological traits are important factors in the role of calcareous nannoplankton in marine ecosystem functions, including the production and export of organic and inorganic carbon. </p> <p>Using morphometric and assemblage data collected from latest Eocene to mid-late Oligocene sediments International Ocean Discovery Program (IODP) Site U1553, Campbell Plateau in the high latitude southwestern Pacific Ocean, we reconstructed the size structure and associated biogeochemical traits (size-fractionated and total community particulate organic and inorganic carbon) of the community through the Oligocene to investigate the impact of climate-driven changes in community composition on calcareous nannoplankton biogeochemistry.</p> <p> </p> <p>The datasets presented in this data record are associated with the manuscript:</p> <p>Sheward, R. M., Herrle, J. O., Fuchs, J., Gibbs, S. J., Bown, P. R. and Eibes, P. M. Biogeochemical traits of a high latitude South Pacific Ocean calcareous nannoplankton community during the Oligocene, to be submitted to <em>Paleoceanograpy and Paleoclimatology</em> in June 2024.</p> <p> </p> <p>This data record contain two primary datasets generated for this study:</p> <ol> <li>assemblage composition (relative <em>coccolith</em> abundance) of the latest Eocene-earliest Oligocene calcareous nannoplankton community</li> <li>morphometric data for the coccolith size of the ten most common morphogroups in the assemblage in this time interval (<em>Chiasmolithus</em>, <em>Clausicoccus subdistichus</em>, <em>Coccolithus</em>, <em>Cyclicargolithus</em>, <em>Reticulofenestra</em>, <em>Sphenolithus</em>, <em>Discoaster</em> and <em>Zygrhablithus bijugatus</em>).</li> </ol> <p> </p> <p>Correspondence should be addressed to: Rosie Sheward (sheward@em.uni-frankfurt.de).</p>
Scanning Electron Microscopy Datasets – Coccospheres and detached coccoliths in waters off the Southeast Pacific margin
<p>For enumeration of coccospheres and detached coccoliths polycarbonate filters were scanned at 800-1500x magnification using a Scanning Electron Microscopy (Quanta FEG 250). </p>
Results of coccolith assemblage and reconstructed primary productivity over the Holocene of marine sediment cores MD77-191 and MD98-2152
Open the record for dataset details and reuse information.
Datasets for the paper "High resolution spatial analyses of trace elements in coccoliths reveal new insights into element incorporation in coccolithophore calcite"
<p>complete datasets for the samples in the paper, published in Scientific Reports</p>
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