Trace elements in ocean ridge basalt glasses: implications for fractionations during mantle evolution and petrogenesis

Hertogen, Jan; Janssens, Martin; Palme, H.

doi:10.1016/0016-7037(80)90209-4

Cited by 216 publications

(114 citation statements)

References 85 publications

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“…Gold and palladium concentrations resemble those reported for OIB (Table 3), but Group 707-E values are the highest yet noted in OIB and MORB. Most MORB Au and Pd values reported by Hertogen et al (1980) are much lower (~0.2 and <0.4 ppb), but samples of these elements from Indian Ocean spreading centers display similar concentrations (3.5 and 5.7 ppb) to Leg 115 hotspot basalts.…”

Section: Noble Metal Concentrationsmentioning

confidence: 99%

“…Some of these include partial melting of the mantle (Campbell and Barnes, 1984;Brugmann et al, 1987); crystal fractionation of silicate phases (Crocket, 1981;Brugmann et al, 1987); oxide phases (Crocket and Chyi, 1972;Agiorgitis and Wolf, 1978); platinum-group-element-bearing (PGE-bearing) alloys (Bird and Basset, 1980;Keays, 1982); segregation of an immiscible sulfide liquid (Hertogen et al, 1980;Hamlyn et al, 1985); and processes related to the movement of volatiles at various stages in the evolutionary cooling history of a magma (Boudreau et al, 1986;Schiffries and Skinner, 1987;Wood, 1987).…”

Section: Introductionmentioning

confidence: 99%

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Distribution of Gold, Palladium, Platinum, Rhodium, Ruthenium, and Iridium in Leg 115 Hotspot Basalts: Implications for Magmatic Processes

Greenough¹,

Fryer²

1990

Proceedings of the Ocean Drilling Program

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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.

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Section: Noble Metal Concentrationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Distribution of Gold, Palladium, Platinum, Rhodium, Ruthenium, and Iridium in Leg 115 Hotspot Basalts: Implications for Magmatic Processes

Greenough¹,

Fryer²

1990

Proceedings of the Ocean Drilling Program

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“…The one MORB sample analyzed by Martin, (1991) was blank dominated, but was certainly no more concentrated than 0.001 ppb. Of the samples studied by Hertogen, et al (1980), most were under .002 ppb., with three exceptions of .013, .076…”

Section: Os Partitioningmentioning

confidence: 98%

“…Re concentrations are available for basalts ( avg= 0.9 ppb. ; Hertogen, et al, 1980), fertile peridotite xenoliths (avg = 0.26 ppb. ; Morgan, 1986) and abyssal peridotites (avg = .162; Martin, 1990.…”

Section: Re Partitioningmentioning

confidence: 99%

The isotope geochemistry of abyssal peridotites and related rocks

Snow¹

1993

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“…comm.). Ocean floor tholeiites normally contain only up to 0.1 ppb Ir (GOTTFRIED and GREENLAND, 1972;HERTOGEN et al, 1980 suggests that Ir has remained in the residual ultramafics after separation of the basaltic melts. A problem seems to exist in fractionating olivine tholeiites from komatiitic primitive melts in respect to their depleted LREE abundances.…”

Section: Olivinementioning

confidence: 99%

Palaeogene komatiites from Gorgona island, East Pacific - A primary magma for ocean floor basalts?

Dietrich¹,

Gansser²,

Sommerauer³

et al. 1981

Geochem. J.

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Gorgona island is the only place in the world where young ultramafic (pyroxenitic) komatiitic lava flows are known to occur. The island, which appears to be a small southern remnant of the Colombian Coastal Cordillera, is built up of serpentinised peridotites, gabbros, basalts and associated Palaeogene oceanic sediments.Spinifex texured rocks occur within the basaltic and doleritic complex, closely associated with pillow basalts of tholeiitic composition. During rapid cooling the order of crystallisation was: olivine (Fo9o_91), high Al-calcic pyroxene and Cr-spinel as the major quenched phases; then olivine (Fo86_82). low Al-calcic pyroxene, plagioclase (An75_81) and Ti-magnetite as quenched products in the interstitial groundmass. Model calculations incorporating major and trace elements show that fractionation of 20-25% olivine + 0.5% Cr-spinel from the komatiitic liquid could produce olivine tholeiites similar to those of Palaeogene Nazca plate. The unique structural setting of the Gorgona rocks probably results from a rapid uplift of a central part of the Nazca ridge including immature magma chambers.

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Trace elements in ocean ridge basalt glasses: implications for fractionations during mantle evolution and petrogenesis

Cited by 216 publications

References 85 publications

Distribution of Gold, Palladium, Platinum, Rhodium, Ruthenium, and Iridium in Leg 115 Hotspot Basalts: Implications for Magmatic Processes

Distribution of Gold, Palladium, Platinum, Rhodium, Ruthenium, and Iridium in Leg 115 Hotspot Basalts: Implications for Magmatic Processes

The isotope geochemistry of abyssal peridotites and related rocks

Palaeogene komatiites from Gorgona island, East Pacific - A primary magma for ocean floor basalts?

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