Greenough John D Fryer Brian J 1990 Noble metal abundances in ODP Leg 115 basalts (Table 1) dataset https://doi.org/10.1594/PANGAEA.755695 Greenough John D Fryer Brian J 1990 Distribution of gold, palladium, platinum, rhodium, ruthenium, and iridium in Leg 115 hotspot basalts: implications for magmatic processes book chapter 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 https://doi.org/10.2973/odp.proc.sr.115.128.1990 71-84 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 59.0168 73.8313 -13.114 5.0815 65.79686000000001 -6.57696 1987-05-22T23:15:00 1987-06-28T07:45:00 -2920.0 -1552.0 ODP Ocean Drilling Program https://www-odp.tamu.edu:443/ Ocean Drilling Program, Texas A&M University ODP http://www-odp.tamu.edu/ https://ror.org/01f5ytq51 115-706A -13.114 61.371 -2517.0 1987-05-22T23:15:00 1987-05-23T08:00:00 47.5 m 39.28 m South Indian Ridge, South Indian Ocean Leg115 https://doi.org/10.2973/odp.proc.ir.115.1988 Backman, Jan Duncan, Robert A 1987-05-13 1987-07-02 Joides Resolution https://www-odp.tamu.edu:443/resolutn.html Drilling/drill rig DRILL 6 cores; 47.5 m cored; 0 m drilled; 82.7 % recovery 115-706C -13.114 61.371 -2518.0 1987-05-24T03:30:00 1987-05-26T00:45:00 121.7 m 19.72 m South Indian Ridge, South Indian Ocean Leg115 https://doi.org/10.2973/odp.proc.ir.115.1988 Backman, Jan Duncan, Robert A 1987-05-13 1987-07-02 Joides Resolution https://www-odp.tamu.edu:443/resolutn.html Drilling/drill rig DRILL 8 cores; 77.4 m cored; 0 m drilled; 25.5 % recovery 115-707C -7.5453 59.0168 -1552.0 1987-05-29T10:30:00 1987-06-02T03:30:00 443.2 m 91.56 m South Indian Ridge, South Indian Ocean Leg115 https://doi.org/10.2973/odp.proc.ir.115.1988 Backman, Jan Duncan, Robert A 1987-05-13 1987-07-02 Joides Resolution https://www-odp.tamu.edu:443/resolutn.html Drilling/drill rig DRILL 27 cores; 259.4 m cored; 0 m drilled; 35.3 % recovery 115-713A -4.193 73.3942 -2920.0 1987-06-16T23:30:00 1987-06-20T09:15:00 191.7 m 114.98 m Indian Ocean Leg115 https://doi.org/10.2973/odp.proc.ir.115.1988 Backman, Jan Duncan, Robert A 1987-05-13 1987-07-02 Joides Resolution https://www-odp.tamu.edu:443/resolutn.html Drilling/drill rig DRILL 22 cores; 191.7 m cored; 0 m drilled; 60 % recovery 115-715A 5.0815 73.8313 -2273.0 1987-06-24T16:00:00 1987-06-28T07:45:00 287.8 m 137.62 m Lakshadweep Sea Leg115 https://doi.org/10.2973/odp.proc.ir.115.1988 Backman, Jan Duncan, Robert A 1987-05-13 1987-07-02 Joides Resolution https://www-odp.tamu.edu:443/resolutn.html Drilling/drill rig DRILL 31 core; 287.8 m cored; 0 m drilled; 47.8 % recovery 390 CC-BY-3.0 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/ Event label Event Event Sample code/label Sample label DSDP/ODP/IODP sample designation hdl:10013/epic.27914.d001 Greenough John D Sample label Lithologic unit/sequence Unit sequence Greenough John D Unit Gold Au ng/kg gold Au Greenough John D Au [ng/kg] Palladium Pd ng/kg palladium http://purl.obolibrary.org/obo/CHEBI_33363 Greenough John D Pd [ng/kg] Rhodium Rh ng/kg rhodium Rh Greenough John D Rh [ng/kg] Platinum Pt ng/kg platinum http://purl.obolibrary.org/obo/CHEBI_33364 Greenough John D Pt [ng/kg] Ruthenium Ru ng/kg ruthenium Ru Greenough John D Ru [ng/kg] Iridium Ir ng/kg iridium Greenough John D Ir [ng/kg] supplement citable author33607 author37483 basis5 campaign87 event13432 event13434 event13437 event13447 event13450 geocode1599 geocode1600 geocode1601 geocode8128 inst34 license101 method10974 method5059 param19350 param19353 param2204 param5440 param790 param8135 param95983 param95984 pi33607 project3 ref33261 term1073788 term1074089 term20611 term20827 term23837 term37737 term40780 term40781 term41088 term44258