Sponge silicon isotope analyses from Triassic–Jurassic boundary samples (Levanto and Malpaso, Perú) and individual spicule analyses on modern sponges (analyzed via SIMS)
Data files
Jan 21, 2025 version files 42.59 KB
-
README.md
2.37 KB
-
Supplementary_Data_Table_4.xlsx
16.78 KB
-
Supplementary_Data_Table_5.xlsx
10.74 KB
-
Supplementary_Data_Table_6.xlsx
12.69 KB
Abstract
This dataset includes silicon isotope ratios measured on sponge spicules (δ30Si) from two sections spanning the Triassic–Jurassic boundary (Levanto and Malpaso, Perú). These data are reported in Yager et al., AJS to constrain dissolved silica in the ocean and provide some of the first quantitative constraints on the global silicon cycle during the Mid-Mesozoic.
README: Sponge silicon isotope analyses from Triassic–Jurassic boundary samples (Levanto and Malpaso, Perú) and individual spicule analyses on modern sponges (analyzed via SIMS)
https://doi.org/10.5061/dryad.dfn2z35bq
Description of the data and file structure
Supplementary information. This includes information about heat treating modern spicules and supplementary tables 1–3.
Supplementary data tables 4–6. This dataset includes silicon isotope ratios measured on sponge spicules (δ30Si) from two sections spanning the Triassic–Jurassic boundary (Levanto and Malpaso, Perú). These data are reported in Yager et al., AJS to constrain dissolved silica in the ocean and provide quantitative constraints on the global silicon cycle during the Mid-Mesozoic. In tables 4–6, each SIMS spot analysis is reported in ‰ relative to NBS28 and Caltech Rose Quartz with the spot's analytical uncertainty reported as its standard deviation (± 1 sigma (‰)). Analyses with > 0.25‰ SD were removed and are not reported.
- Supplementary Table 4. Levanto sponge spicule silicon isotope data. Column 'Sample' refers to the sample name, which corresponds to the same samples as those used in Yager et al., 2017. The column 'Age (Ma)' refers to the sample age. The column 'Spicule #' refers to the spicule measured within an individual sample.
- Supplementary Table 5. Malpaso sponge spicule silicon isotope data.
- Supplementary Table 6. Modern sponge spicule silicon isotope data from sponges referred to in Table 1 of the supplementary material.
Yager, J. A., West, A. J., Trower, E. J., Fischer, W. W., Ritterbush, K., Rosas, S., Bottjer, D. J., Celestian, A. J., Berelson, W. M., & Corsetti, F. A. (n.d.). Evidence for Low Dissolved Silica in mid-Mesozoic Oceans. American Journal of Science, 324, 18. https://doi.org/10.2475/001c.122691
Yager, J. A., West, A. J., Corsetti, F. A., Berelson, W. M., Rollins, N. E., Rosas, S., & Bottjer, D. J. (2017). Duration of and decoupling between carbon isotope excursions during the end-Triassic mass extinction and Central Atlantic Magmatic Province emplacement. Earth and Planetary Science Letters, 473, 227–236. https://doi.org/10.1016/j.epsl.2017.05.031
Methods
Lithified sedimentary rock samples from Levanto and Malpaso, Perú were collected from outcrops and cut into thin sections. Each thin section was examined for the presence of siliceous sponge spicules. Samples with >5% sponge spicule material were cut for one-inch round thin sections for secondary ion mass spectrometry (SIMS) analyses (n = 4 from Levanto and n = 2 from Malpaso). We also mounted and measured modern spicules for SIMS analyses and report those here (n = 4), since typically the sponge silicon isotope proxy is measured using an ICP-MS.