(Table 2) Silicon isotope data for sponge spicules from ODP Hole 113-689B

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 mode...

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Bibliographic Details
Main Author: De La Rocha, Christina L
Format: Dataset
Language:English
Published: PANGAEA 2003
Subjects:
113-689B
AGE
Calculated
DEPTH
sediment/rock
DRILL
Drilling/drill rig
DSDP/ODP/IODP sample designation
Joides Resolution
Leg113
Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)
Ocean Drilling Program
ODP
Sample code/label
South Atlantic Ocean
δ30Si
biogenic silica
error
Maud Rise
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.712437
https://doi.org/10.1594/PANGAEA.712437
Description
Summary: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.

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