Silicon isotopes from IODP Site 323-U1340
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PANGAEA
2025
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| author | deLong, Kimberly Blackburn, Terrence Caissie, Beth Addison, Jason A Stroynowski, Zuzanna N Reimi Sipala, Maria Marcantonio, Franco Ravelo, Ana Christina |
| author_facet | deLong, Kimberly Blackburn, Terrence Caissie, Beth Addison, Jason A Stroynowski, Zuzanna N Reimi Sipala, Maria Marcantonio, Franco Ravelo, Ana Christina |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | The Bølling-Allerød deglacial event is marked by high diatom productivity and opal deposition throughout the subarctic Pacific. To investigate the cause of this event, we quantified several productivity-related sedimentary parameters that reflect the near-surface biogeochemistry from the Integrated Ocean Drilling Program (IODP) Site 323-U1340 in the Bering Sea. Silicon isotopes (δ29Si and δ30Si) from single-genus Coscinodiscus diatom frustules. Diatom silicon isotope values were generated in the Keck Laboratory at the University of California, Santa Cruz using the following methods. Freeze-dried samples were washed on a 63μm sieve to remove clays and dried in a 55°C oven. Samples were then cleaned with the M2 method, without the Calgon step, in non-glass containers and again oven-dried. To isolate a single diatom genus, samples were dry-sieved and ice rafted debris, radiolarians, spicules, and other genera were removed from the 63-125 μm portion by picking under a microscope and visually confirmed to be >99% Coscinodiscus specimens. Coscinodiscus species present were >95% Coscinodiscus marginatus with occasional Coscinodiscus oculus-iridis and Coscinodiscus radiatus. To dissolve samples, ≤0.002 g was transferred to 100 μL of 10 M NaOH in screw-top Teflon vials and reacted in Parr vessels at 200°C for three days. Samples were transferred to BioRad 50W X8 cation exchange columns previously cleaned with HCl and Milli-Q water (after Georg et al., 2006; doi:10.1016/j.chemgeo.2006.06.006), and eluted in Milli-Q water. Intensities of 28Si, 29Si and 30Si were measured using standard-sample bracketing on a Neptune MC ICP-MS at high resolution equipped with an Apex Omega desolvating nebulizer. All values are reported vs. NBS 28. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_974823 |
| institution | PANGAEA |
| language | en |
| publishDate | 2025 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Silicon isotopes from IODP Site 323-U1340 deLong, Kimberly Blackburn, Terrence Caissie, Beth Addison, Jason A Stroynowski, Zuzanna N Reimi Sipala, Maria Marcantonio, Franco Ravelo, Ana Christina 323-U1340; 323-U1340A; 323-U1340D; AGE; Age, 14C calibrated, CALIB (Stuiver & Reimer, 1993); Age model; Bering Sea; Bering Sea Paleoceanography; biogenic opal; COMPCORE; Composite Core; Depth, composite; Diatom assemblage; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Exp323; Half; Inductively coupled plasma mass spectrometer (ICP-MS), ThermoFisher Scientific, Neptune Plus; coupled with Apex Omega desolvating nebulizer; IODP Depth Scale Terminology; Joides Resolution; nitrogen content; Replicates; Sample code/label; Silicon isotopes; Uranium-Thorium; δ29Si; δ29Si, standard deviation; δ30Si; δ30Si, standard deviation The Bølling-Allerød deglacial event is marked by high diatom productivity and opal deposition throughout the subarctic Pacific. To investigate the cause of this event, we quantified several productivity-related sedimentary parameters that reflect the near-surface biogeochemistry from the Integrated Ocean Drilling Program (IODP) Site 323-U1340 in the Bering Sea. Silicon isotopes (δ29Si and δ30Si) from single-genus Coscinodiscus diatom frustules. Diatom silicon isotope values were generated in the Keck Laboratory at the University of California, Santa Cruz using the following methods. Freeze-dried samples were washed on a 63μm sieve to remove clays and dried in a 55°C oven. Samples were then cleaned with the M2 method, without the Calgon step, in non-glass containers and again oven-dried. To isolate a single diatom genus, samples were dry-sieved and ice rafted debris, radiolarians, spicules, and other genera were removed from the 63-125 μm portion by picking under a microscope and visually confirmed to be >99% Coscinodiscus specimens. Coscinodiscus species present were >95% Coscinodiscus marginatus with occasional Coscinodiscus oculus-iridis and Coscinodiscus radiatus. To dissolve samples, ≤0.002 g was transferred to 100 μL of 10 M NaOH in screw-top Teflon vials and reacted in Parr vessels at 200°C for three days. Samples were transferred to BioRad 50W X8 cation exchange columns previously cleaned with HCl and Milli-Q water (after Georg et al., 2006; doi:10.1016/j.chemgeo.2006.06.006), and eluted in Milli-Q water. Intensities of 28Si, 29Si and 30Si were measured using standard-sample bracketing on a Neptune MC ICP-MS at high resolution equipped with an Apex Omega desolvating nebulizer. All values are reported vs. NBS 28. |
| title | Silicon isotopes from IODP Site 323-U1340 |
| topic | 323-U1340; 323-U1340A; 323-U1340D; AGE; Age, 14C calibrated, CALIB (Stuiver & Reimer, 1993); Age model; Bering Sea; Bering Sea Paleoceanography; biogenic opal; COMPCORE; Composite Core; Depth, composite; Diatom assemblage; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Exp323; Half; Inductively coupled plasma mass spectrometer (ICP-MS), ThermoFisher Scientific, Neptune Plus; coupled with Apex Omega desolvating nebulizer; IODP Depth Scale Terminology; Joides Resolution; nitrogen content; Replicates; Sample code/label; Silicon isotopes; Uranium-Thorium; δ29Si; δ29Si, standard deviation; δ30Si; δ30Si, standard deviation |
| url | https://doi.org/10.1594/PANGAEA.974823 |