De La Rocha, Christina L (2003): (Table 2) Silicon isotope data for sponge spicules from ODP Hole 113-689B [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.712437
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Abstract:
The silicon isotope composition (d30Si) of biogenic opal provides a view of the silica cycle at times in the past. Reconstructions require the knowledge of silicon isotope fractionation during opal biomineralization. The d30Si of specimens of hexactinellid sponges and demosponges growing in the modern ocean ranged from -1.2 per mil to -3.7 per mil (n = 6), corresponding to the production of opal that has a d30Si value 3.8 per mil +/- 0.8 per mil more negative than seawater silicic acid and a fractionation factor (a) of 0.9964. This is three times the fractionation observed during opal formation by marine diatoms and terrestrial plants and is the largest fractionation of silicon isotopes observed for any natural process on Earth. The d30Si values of sponge spicules across the Eocene-Oligocene boundary at Ocean Drilling Program Site 689 on Maud Rise range from -1.1 per mil to -3.0 per mil, overlapping the range observed for sponges growing in modern seawater.
Related to:
De La Rocha, Christina L (2003): Silicon isotope fractionation by marine sponges and the reconstruction of the silicon isotope composition of ancient deep water. Geology, 31(5), 423-426, https://doi.org/10.1130/0091-7613(2003)031%3C0423:SIFBMS%3E2.0.CO;2
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: -64.517000 * Longitude: 3.099900
Date/Time Start: 1987-01-16T08:00:00 * Date/Time End: 1987-01-18T06:45:00
Minimum DEPTH, sediment/rock: 111.4 m * Maximum DEPTH, sediment/rock: 141.7 m
Event(s):
113-689B * Latitude: -64.517000 * Longitude: 3.099900 * Date/Time Start: 1987-01-16T08:00:00 * Date/Time End: 1987-01-18T06:45:00 * Elevation: -2091.0 m * Penetration: 297.3 m * Recovery: 229.45 m * Location: South Atlantic Ocean * Campaign: Leg113 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 33 cores; 297.3 m cored; 0 m drilled; 77.2 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | AGE | Age | ka BP | Geocode | ||
| 3 | Sample code/label | Sample label | De La Rocha, Christina L | DSDP/ODP/IODP sample designation | ||
| 4 | δ30Si, biogenic silica | δ30Si bSiO2 | ‰ | De La Rocha, Christina L | Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS) | vs. NBS28; 30Si/28Si = 0.0335320 |
| 5 | δ30Si, error | δ30Si e | ± | De La Rocha, Christina L | Calculated |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
39 data points