Greenough, John D; Fryer, Brian J (1990): Noble metal abundances in ODP Leg 115 basalts (Table 1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.755695, Supplement to: Greenough, JD; Fryer, BJ (1990): Distribution of gold, palladium, platinum, rhodium, ruthenium, and iridium in Leg 115 hotspot basalts: implications for magmatic processes. In: Duncan, RA; Backmann, J; Peterson, LC; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 115, 71-84, https://doi.org/10.2973/odp.proc.sr.115.128.1990
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Published: 1990 (exact date unknown) • DOI registered: 2011-02-11
Abstract:
A comparison of 50 basalts recovered at Sites 706, 707, 713, and 715 along the Reunion hotspot trace during Ocean Drilling Program Leg 115 in the Indian Ocean shows that seafloor alteration had little effect on noble metal concentrations (Au, Pd, Pt, Rh, Ru, and Ir), determined by inductively coupled plasma-mass spectrometry (ICP-MS), which generally tend to decrease with magma evolution. Their compatible-element behavior may be related to the precipitation of Ir-Os-based alloys, chromite, sulfides, and/or olivine and clinopyroxene in some combination. The simplest explanation indicates silicate control of concentrations during differentiation.
Basalts from the different sites show varying degrees of alkalinity. Noble metal abundances tend to increase with decreasing basalt alkalinity (i.e., with increasing percentages of mantle melting), indicating that the metals behave as compatible elements during mantle melting. The retention of low-melting-point Au, Pd, and Rh in mantle sulfides, which mostly dissolve before significant proportions of Ir-Os-based alloys melt, explains increasing Pd/Ir ratios with decreasing alkalinity (increasing melting percentages) in oceanic basalts. High noble metal concentrations in Indian Ocean basalts (weighted averages of Au, Pd, Rh, Pt, Ru, and Ir in Leg 115 basalts are 3.2, 8.1, 0.31, 7.3, 0.22, and 0.11 ppb, respectively), compared with basalts from some other ocean basins, may reflect fundamental primary variations in upper- mantle noble metal abundances
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Median Latitude: -6.576960 * Median Longitude: 65.796860 * South-bound Latitude: -13.114000 * West-bound Longitude: 59.016800 * North-bound Latitude: 5.081500 * East-bound Longitude: 73.831300
Date/Time Start: 1987-05-22T23:15:00 * Date/Time End: 1987-06-28T07:45:00
Minimum Elevation: -2920.0 m * Maximum Elevation: -1552.0 m
Event(s):
115-706A * Latitude: -13.114000 * Longitude: 61.371000 * Date/Time Start: 1987-05-22T23:15:00 * Date/Time End: 1987-05-23T08:00:00 * Elevation: -2517.0 m * Penetration: 47.5 m * Recovery: 39.28 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg115 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 6 cores; 47.5 m cored; 0 m drilled; 82.7 % recovery
115-706C * Latitude: -13.114000 * Longitude: 61.371000 * Date/Time Start: 1987-05-24T03:30:00 * Date/Time End: 1987-05-26T00:45:00 * Elevation: -2518.0 m * Penetration: 121.7 m * Recovery: 19.72 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg115 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 8 cores; 77.4 m cored; 0 m drilled; 25.5 % recovery
115-707C * Latitude: -7.545300 * Longitude: 59.016800 * Date/Time Start: 1987-05-29T10:30:00 * Date/Time End: 1987-06-02T03:30:00 * Elevation: -1552.0 m * Penetration: 443.2 m * Recovery: 91.56 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg115 * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 27 cores; 259.4 m cored; 0 m drilled; 35.3 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | Greenough, John D | DSDP/ODP/IODP sample designation | ||
| 3 | Lithologic unit/sequence | Unit | Greenough, John D | |||
| 4 | Gold | Au | ng/kg | Greenough, John D | ||
| 5 | Palladium | Pd | ng/kg | Greenough, John D | ||
| 6 | Rhodium | Rh | ng/kg | Greenough, John D | ||
| 7 | Platinum | Pt | ng/kg | Greenough, John D | ||
| 8 | Ruthenium | Ru | ng/kg | Greenough, John D | ||
| 9 | Iridium | Ir | ng/kg | Greenough, John D |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
390 data points