Blusztajn, Jerzy S; Hart, Stanley R; Ravizza, Gregory E; Dick, Henry J B (2000): (Tables 1-2) Re, Os concentrations and 187Os/188Os of gabbros from ODP Site 118-735B [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.706146, Supplement to: Blusztajn, JS et al. (2000): Platinum-group elements and Os isotopic characteristics of the lower oceanic crust. Chemical Geology, 168(1-2), 113-122, https://doi.org/10.1016/S0009-2541(00)00186-8
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Published: 2000 (exact date unknown) • DOI registered: 2008-11-29
Abstract:
We present osmium isotopic compositions and Os, Re and platinum-group element (PGE) contents in the lower oceanic crust gabbros from ODP Site 735B on the Southwest Indian Ridge. The average gabbros are very depleted in PGEs, e.g. the Os concentrations are very low and range from 0.5 to 38 ppt. One troctolite sample is an exception, containing, e.g. 376 ppt Os, 396 ppt Ir and 8 ppb Pd. Re contents are extremely heterogeneous, ranging from 128 ppt to 28 ppb. The present day 187Os/188Os varies from 0.140 to 0.467, and correlates with Rb/Cs, suggesting that seawater alteration affected the Os isotopic system. The average Os content in the lower oceanic crust is about 9 ppt while median value for Re is about 487 ppt. Such very high Re/Os is relatively similar to the upper MORB-type oceanic crust, indicating that recycled ocean crust basalts and gabbros will rapidly develop very radiogenic Os isotopic signatures.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: -32.724000 * Longitude: 57.266200
Date/Time Start: 1987-12-06T04:45:00 * Date/Time End: 1987-12-11T01:00:00
Minimum DEPTH, sediment/rock: 31.95 m * Maximum DEPTH, sediment/rock: 481.45 m
Event(s):
118-735B * Latitude: -32.724000 * Longitude: 57.266200 * Date/Time Start: 1987-12-06T04:45:00 * Date/Time End: 1987-12-11T01:00:00 * Elevation: -731.0 m * Penetration: 500.7 m * Recovery: 434.81 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg118 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 88 cores; 500.7 m cored; 0 m drilled; 86.8 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | Sample code/label | Sample label | Blusztajn, Jerzy S | DSDP/ODP/IODP sample designation | strip samples | |
| 3 | Sample code/label 2 | Sample label 2 | Blusztajn, Jerzy S | |||
| 4 | Main Lithology | Main lith | Blusztajn, Jerzy S | |||
| 5 | Depth, top/min | Depth top | m | Blusztajn, Jerzy S | ||
| 6 | Depth, bottom/max | Depth bot | m | Blusztajn, Jerzy S | ||
| 7 | Rhenium | Re | µg/kg | Blusztajn, Jerzy S | Isotope dilution inductively coupled plasma mass spectrometry | |
| 8 | Osmium | Os | ng/kg | Blusztajn, Jerzy S | Isotope dilution inductively coupled plasma mass spectrometry | |
| 9 | Osmium-187/Osmium-188 ratio | 187Os/188Os | Blusztajn, Jerzy S | Isotope dilution inductively coupled plasma mass spectrometry | ||
| 10 | Osmium-187/Osmium-188 ratio | 187Os/188Os | Blusztajn, Jerzy S | Calculated | 12 Ma age corrected | |
| 11 | Rhenium-187/Osmium-188 ratio | 187Re/188Os | Blusztajn, Jerzy S | Isotope dilution inductively coupled plasma mass spectrometry |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
202 data points
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Datasets with similar metadata
- Ozawa, K; Meyer, PS; Bloomer, SH (1991): Mineralogy and textures of gabbros from ODP Hole 118-735B. https://doi.org/10.1594/PANGAEA.757443
- Kikawa, E; Pariso, JE (1991): Magnetic properties of gabbros from ODP Hole 118-735B. https://doi.org/10.1594/PANGAEA.757770
- Hart, SR; Blusztajn, JS; Dick, HJB et al. (1999): Chemical and isotopic compositions of rocks and minerals from ODP Hole 118-735B. https://doi.org/10.1594/PANGAEA.708204