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38 results for “aragonite”
Fig. 12 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 12. Water salinities (in ppt) calculated from Recent and fossil aragonite samples. Abbreviations: op, outer prismatic layer; ip, inner prismatic layer; nac, nacreous layer; cl, crossed lamellar layer.
Fig. 11 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 11. Principal component plots based on the chemical compositions of the Recent and fossil shells, sediments and sedimentary calcite. Sedimentary calcite (labelled "calcite" in the diagram) is clearly separated from the Recent and fossil shell calcites.
Fig. 8 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 8. Element distribution maps for Sr (A), Mg (B), Fe (C), and S (D) across the aragonite/calcite boundaries in Goniocamax sp. from the Turonian of N Siberia.
Fig. 7 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 7. Minor element contents (in ppm) in fossil shells. A. Average compositions of aragonite and calcite in Goniocamax. B. Average compositions of inner prismatic and nacreous layers in ammonites. C. The compositions of a crossed lamellar aragonite layer in a gastropod; a nacreous aragonite layer in an inoceramid shell, and a foliated calcite layer in Pecten.
Fig. 6 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 6. Box and whisker plots for selected minor elements in Recent and fossil shells, and sedimantary calcite. Details of analysed samples are given in the section "Materials and methods". Plots are for magnesium Mg (A), strontium Sr (B), sodium Na (C), iron Fe (D), sulphur S (E), and phosphorus P (F). Recent samples: left part of the graph; fossil samples: right part of the graph.
Fig. 4 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 4. Minor element contents (in ppm) in Recent shells. A. Average compositions of inner prismatic and outer prismatic aragonite layers in Sepia and Spirula. B. Average compositions of inner prismatic, nacreous and outer prismatic aragonite layers in Nautilus macromphalus. C. Average compositions of crossed lamellar aragonite layer in gastropods; in the nacreous aragonite layer in Pinna nobilis, and foliated calcite layer in Pecten.
Fig. 5 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 5. Box and whisker plots based on the chemical compositions of the shells. A. Explanation of the box and whisker plot. B. Box and whisker plot for Ca in Recent and fossil shells, and sedimentary calcite.
Fig. 9 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 9. Principal component plots based on the chemical compositions of the Recent and fossil shells. A. Samples are grouped according to their age, with Recent shells having relatively high Ca and Na contents, and low Fe, P, and Sr contents. B. Samples are grouped according to their mineralogy in terms of calcite and aragonite. Calcite samples have relatively high Mg, S, and Ca contents, and aragonite samples have higher Sr contents.
Fig. 10. 3D in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 10. 3D principal component plots based on the chemical compositions of the Recent and fossil shells. Axis 1 has high negative loadings corresponding to P, Fe, and Sr, with a positive Na loading. Axis 2 has high negative loadings corresponding to S, Ca, and Fe, and a positive Sr loading. Axis 3 has a high negative loading corresponding to Mg and a positive Sr loading. Recent and fossil calcites are separated according to axis 3, whereas Recent and fossil aragonites are separated according to axis 1.
Fig. 2 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 2. Secondary electron images illustrating the microstructures of Recent shells. A. Dorsal shield of Sepia sp. (from New Caledonia), showing the thin inner prismatic layer, the nacreous layer and the thick multi−layered outer spherulitic prismatic layer. B. Outer wall of Spirula sp. (from New Caledonia), showing two prismatic layers and a mainly organic thin nacreous layer (arrow). C. Nautilus macromphalus (from New Caledonia). D. Nacreous layer of the pelecypod Pinna nobilis (from the Mediterranean Sea, Port Cros Island). E. Foliated calcite layer of Pecten maximus (from Brittany, France). F. Crossed lamellar aragonite layer of the gastropod Murex sp. (of unknown origin). Abbreviations: ip, inner prismatic layer; nac, nacreous layer; op, outer prismatic layer. All specimens from the UPS collection of Recent molluscs, not numbered.
Fig. 3 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 3. Secondary electron images illustrating the microstructures in Goniocamax sp. (A–D) and fossil molluscs (E–G); all samples from the Turonian of N Siberia. A. UPS−2435, adjacent calcitic and aragonitic zones; the growth lines are not clearly visible in the calcitic zones. B. UPS−2460, non−compact, thin calcite prisms. C. UPS−2459, aragonitic sectors with preserved growth lines. D. UPS−2460, growth lines in the well−preserved aragonite. E. UPS−2448, aragonite nacreous of an ammonite shell. F. UPS−2591, crossed lamellar layer of a fossil gastropod. G. UPS−2587, nacreous layer of an inoceramid shell.
Fig. 1 in Aragonitic rostra of the Turonian belemnitid Goniocamax: Arguments from diagenesis
Fig. 1. Two SEM images illustrating different aspects of Goniocamax sp. from the Turonian of Northern Siberia, Piasina River, Western Taymyr Peninsula. A. UPS−1483, polished and etched longitudinal section of a rostrum showing the aragonitic region (a, white) and the calcitic region (c, black). B. UPS−2451, longitudinal fracture showing a part of the phragmocone (p) with some septa visible, and rostrum (r).
Temperature effects on the distribution of aragonitic and calcite-secreting epifaunal bivalves
<p>This dataset contains the necessary data and code to reproduce the analyses shown in the manuscript "Temperature effects on the distribution of aragonitic and calcite-secreting epifaunal bivalves".</p> <p>To prepare the OBIS data from the original download for the analysis, using R, it is necessary to 1. deposit the files in the "data" folder in the R working directory, 2. run the script "worms_prepare.R", 3. run the script "obis_data_prepare.R".</p> <p>To directly run the analyses with the cleaned data set, proceed from 1. with the R scripts corresponding to the figures shown in the manuscript.</p>
Aragonite
**Ejemplar:** Aragonito/aragonite **Clase:** carbonato **Localidad:** Camporrobles (Valencia) **Descripción:** Cristales pseudohexagonales grises, aislados y formando maclas sobre matriz de yeso (Triásico) **Sigla museo, colección y entidad:** MGM 5284, colección minerales Museo Universitat de València de Historia Natural **Técnica digitalización / modelo**: fotogrametría con cámara Pentax K-1 Mark II **Software empleado**: Agisoft Metashape Calida alta nube densa y malla poligonal **Autor digitalización:** Jose A. Villena **Donación:** Honorio Cócera **Cita ejemplar:** modelo 3D colección mineralógica del MUVHN Source: Objaverse 1.0 / Sketchfab
Data and code for "Coral calcifying fluid aragonite saturation states derived from Raman spectroscopy"
<p>This file contains all the data and code for "Coral calcifying fluid aragonite saturation states derived from Raman spectroscopy" by DeCarlo et al. in Biogeosciences. Run the file, "run.R" in R to reproduce the analysis and create all the figures.</p> <p>Please see the published paper for methods and details: https://www.biogeosciences-discuss.net/bg-2017-194/</p>
Shelled Pteropod individual-based model output for the publication: The impact of aragonite saturation variability on shelled pteropods: An attribution study in the California current system
Open the record for dataset details and reuse information.
Data from: Aragonite bias exhibits systematic spatial variation in the late Cretaceous Western Interior Seaway, North America
Preferential dissolution of the biogenic carbonate polymorph aragonite promotes preservational bias in shelly marine faunas. Whilst field studies have documented the impact of preferential aragonite dissolution on fossil molluscan diversity, its impact on regional and global biodiversity metrics is debated. Epicontinental seas are especially prone to conditions which both promote and inhibit preferential dissolution, which may result in spatially extensive zones with variable preservation. Here we present a multi-faceted evaluation of aragonite dissolution within the late Cretaceous Western Interior Seaway of North America. Occurrence data of molluscs from two time intervals (Cenomanian-Turonian boundary, early Campanian) are plotted on new high-resolution paleogeographies to assess aragonite preservation within the seaway. Fossil occurrences, diversity estimates and sampling probabilities for calcitic and aragonitic fauna were compared in zones defined by depth and distance from the seaway margins. Apparent range sizes, which could be influenced by differential preservation potential of aragonite between separate localities, were also compared. Our results are consistent with exacerbated aragonite dissolution within specific depth zones for both time slices, with aragonitic bivalves additionally showing a statistically significant decrease in range size compared to calcitic fauna within carbonate-dominated Cenomanian-Turonian strata. However, we are unable to conclusively show that aragonite dissolution impacted diversity estimates. Therefore, whilst aragonite dissolution is likely to have affected the preservation of fauna in specific localities, time averaging and instantaneous preservation events preserve regional biodiversity. Our results suggest that the spatial expression of taphonomic biases should be an important consideration for paleontologists working on paleobiogeographic problems.
Supplementary material 4 from: Miyazaki Y, Reimer JD (2015) A new genus and species of octocoral with aragonite calcium-carbonate skeleton (Octocorallia, Helioporacea) from Okinawa, Japan. ZooKeys 511: 1-23. https://doi.org/10.3897/zookeys.511.9432
Supplemental Table 4: Explanation note: Genetic distances (p-distances) for mtMutS between Nanipora kamurai and Heliopora coelurea, and for other species of octocorals included in COI phylogeny (See Suppl. material 2).
Supplementary material 3 from: Miyazaki Y, Reimer JD (2015) A new genus and species of octocoral with aragonite calcium-carbonate skeleton (Octocorallia, Helioporacea) from Okinawa, Japan. ZooKeys 511: 1-23. https://doi.org/10.3897/zookeys.511.9432
Supplemental Table 3: Explanation note: Genetic distances (p-distances) for mtMutS between Nanipora kamurai and Heliopora coelurea and for other species of octocorals included in mtMutS phylogeny (see Fig. 12 and Suppl. material 2).
Supplementary material 2 from: Miyazaki Y, Reimer JD (2015) A new genus and species of octocoral with aragonite calcium-carbonate skeleton (Octocorallia, Helioporacea) from Okinawa, Japan. ZooKeys 511: 1-23. https://doi.org/10.3897/zookeys.511.9432
Supplemental Table 2: Explanation note: Outgroup sequences from GenBank used in molecular phylogenetic analyses.
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